Mitsubishi Lancer 2006 User Manual

GROUP INDEX

LANCER

WORKSHOP MANUAL

SUPPLEMENT

FOREWORD

This Workshop manual contains procedures for service mechanics, including removal, disassembly, inspection, adjustment, reassembly and installation. Use the following manuals in combination with this manual as required.

General . . . . . . . . . . . . . . . . . . . . . . . .

Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . .

TECHNICAL INFORMATION MANUAL

PYME0302 PYME0302-A PYME0302-B

WORKSHOP MANUAL

CHASSIS GROUP PWME0302 PWME0302-A PWME0302-B

BODY REPAIR MANUAL

PBME0302 PBME0302-A PBME0302-B

PARTS CATALOGUE

B606K006A_

All information, illustrations and product descriptions contained in this manual are current as at the time of publication. We, however, reserve the right to make changes at any time without prior notice or obligation.

©Mitsubishi Motors Corporation Oct. 2005

GROUP 00

GENERAL

CONTENTS

VEHICLE IDENTIFICATION . . . . . . . 00-2 GENERAL DATA AND

SPECIFICATIONS . . . . . . . . . . . . . . . 00-3

00-1

00-2

VEHICLE IDENTIFICATION

GENERAL

VEHICLE IDENTIFICATION

M1001000401448

MODELS

Model code Engine model Price class Transmission model Fuel supply

system

CS9A SRHML6 4G63-DOHC (1,997 mL) Intense F4A4B

<2WD, 4A/T>

No. Item Content

MODEL CODE

CS 9 W L

123

LNHM 6

456789

AC303950

1 Development CS: MITSUBISHI LANCER

2 Engine type 9: 1,997mL

3 Sort A: Passenger car

4 Body style S: 4-door sedan

5 Transmission

type

6 Trim level H: Intense

7 Specification

engine feature

8 Steering wheel

location

R: 4-speed automatic transmission

M: MPI-DOHC

L: Left hand

MPI

9 Destination 6: For Europe

GENERAL

GENERAL DATA AND SPECIFICATIONS

1 2

3465

00-3

M1001000901197

Items CS9A

SRHML6

Vehicle dimensions mm Front track 1 1,470

Overall width 2 1,715

Front overhang 3 965

Wheel base 4 2,600

Rear overhang 5 970

Overall length 6 4,535

Ground clearance (unladen) 7 135

Overall height (unladen) 8 1,415

Rear track 9 1,470

Vehicle weight kg Kerb weight 1,295

Max. gross vehicle weight 1,770

Max. axle weight rating-front 930

Max. axle weight rating-rear 840

Max. trailer weight With brake 1,000

Without brake 400

Max. trailer-nose weight 60

AC303990

Seating capacity 5

Engine Model code 4G63

To ta l d i spl ac em en t mL 1,997

Maximum output kW/r/min 99/5,750

Maximum torque N⋅m/r/min 176/4,500

Transmission Model code F4A4B

Type 4-speed automatic

Fuel system Fuel supply system MPI

Maximum speed km/h 187

Minimum turning radius m 5.7

NOTES

13D-1

MULTIPOINT FUEL

INJECTION (MPI)

<4G63>

CONTENTS

GENERAL 2.................................

Outline of Change 2............................

GENERAL INFORMATION 3...................

SERVICE SPECIFICATIONS 6.................

SEALANT 6..................................

SPECIAL TOOLS 7...........................

TROUBLESHOOTING 10......................

ON-VEHICLE SERVICE 90....................

Throttle Body (Throttle Valve Area)

Cleaning 90...................................

Throttle Position Sensor Adjustment 90............

Basic Idle Speed Adjustment 91..................

Fuel Pressure Test 92...........................

Component Location 95.........................

Engine Control Relay Continuity Check 96.........

Fuel Pump Relay Continuity Check 96.............

Intake Air Temperature Sensor Check 97..........

Engine Coolant Temperature Sensor Check 98.....

Throttle Position Sensor Check 98................

Oxygen Sensor Check 99.......................

Injector Check 101..............................

Idle Speed Control (ISC) Servo (Stepper Motor)

Check 102.....................................

Purge Control Solenoid Valve Check 104..........

EGR Control Solenoid Valve Check 104...........

13D-2

MPI <4G63> ï General

GENERAL

OUTLINE OF CHANGE

Following service procedures have been established due to the addition of vehicles with 4G63-MPI engine for Russia.

MPI <4G63> ï General Information

GENERAL INFORMATION

13D-3

The Multipoint Fuel Injection System consists of sensors which detect the engine conditions, the engine-A/T-ECU which controls the system based on signals from these sensors, and actuators which operate under the control of the engine-A/T-ECU. The engine-A/T-ECU

FUEL INJECTION CONTROL

The injector drive times and injection timing are controlled so that the optimum air/fuel mixture is supplied to the engine to correspond to the continually-changing engine operation conditions. A single injector is mounted at the intake port of each cylinder. Fuel is sent under pressure from the fuel tank by the fuel pump, with the pressure being regulated by the fuel pressure regulator. The fuel thus regulated is distributed to each of the injectors. Fuel injection is normally carried out once for each cylinder for every two rotations of the crankshaft. The firing order is 1ï3ï4ï2. This is called sequential fuel injection. The

carries out activities such as fuel injection control, idle speed control and ignition timing control. In addition, the engine-A/T-ECU is equipped with several diagnosis modes which simplify troubleshooting when a problem develops.

engine-A/T-ECU provides a richer air/fuel mixture by carrying out “open-loop” control when the engine is cold or operating under high load conditions in order to maintain engine performance. In addition, when the engine is warm or operating under normal conditions, the engine-A/T-ECU controls the air/fuel mixture by using the oxygen sensor signal to carry out “closed-loop” control in order to obtain the theoretical air/fuel mixture ratio that provides the maximum cleaning performance from the three way catalyst.

IDLE AIR CONTROL

The idle speed is kept at the optimum speed by controlling the amount of air that bypasses the throttle valve in accordance with changes in idling conditions and engine load during idling. The engine-A/T-ECU drives the idle speed control motor to keep the engine running at the pre-set idle target speed in accordance with the engine coolant temperature and air

IGNITION TIMING CONTROL

The power transistor located in the ignition primary circuit turns ON and OFF to control the primary current flow to the ignition coil. This controls the ignition timing in order to provide the optimum ignition timing with respect to the

SELF-DIAGNOSIS FUNCTION

D When an abnormality is detected in one

of the sensors or actuators related to emission control, the engine warning lamp (check engine lamp) illuminates as a warning to the driver.

D When an abnormality is detected in one

of the sensors or actuators, a diagnosis

conditioner load. In addition, when the air conditioner switch is turned off and on while the engine is idling, the idle speed control motor operates to adjust the throttle valve bypass air amount in accordance with the engine load conditions in order to avoid fluctuations in the engine speed.

engine operating conditions. The ignition timing is determined by the engine-A/T-ECU from the engine speed, intake air volume, engine coolant temperature and atmospheric pressure.

code corresponding to the abnormality is output.

D The RAM data inside the engine-A/T-ECU

that is related to the sensors and actuators can be read by means of the M.U.T.-II/III. In addition, the actuators can be force-driven under certain circumstances.

13D-4

Throttl

Inject

tificati

HDA250E

MPI <4G63> ï General InformationMPI <4G63> ï General Information

OTHER CONTROL FUNCTIONS

1. Fuel Pump Control

3. Fan Motor Control Turns the fuel pump relay ON so that current is supplied to the fuel pump while the engine is cranking or running.

2. A/C Relay Control Turns the compressor clutch of the A/C ON and OFF.

4. Purge Control Solenoid Valve Control

5. EGR Control Solenoid Valve Control

GENERAL SPECIFICATIONS

Item Specification

The revolutions of the radiator fan and condenser fan are controlled in response to the engine coolant temperature and vehicle speed.

ebody

Engine-A/TECU

Sensors

ebore mm

Throttle position sensor Variable resistor type

Idle speed control servo Stepper motor type

Identification No. E6T37983

Air flow sensor Karman vortex type

Barometric pressure sensor Semiconductor type

Intake air temperature sensor Thermistor type

Engine coolant temperature sensor Thermistor type

Oxygen sensor Zirconia type

Inhibitor switch Contact switch type

Camshaft position sensor Hall element type

Crank angle sensor Hall element type

Detonation sensor Piezoelectric type

Power steering fluid pressure switch Contact switch type

Actuators

Fuel pressure regulator

Engine control relay Contact switch type

Fuel pump relay Contact switch type

Injector type and number Electromagnetic type, 4

oriden

EGR control solenoid valve Duty cycle type solenoid valve

Purge control solenoid valve Duty cycle type solenoid valve

Regulator pressure kPa 328

on mar

MPI <4G63> ï General Information

MULTI-POINT FUEL INJECTION SYSTEM DIAGRAM

13D-5

L1 Oxygen sensor (front) L2 Oxygen sensor (rear) L3 Air flow sensor L4 Intake air temperature sensor L5 Throttle position sensor L6 Camshaft position sensor L7 Crank angle sensor L8 Barometric pressure sensor L9 Engine coolant temperature sensor L10 Detonation sensor

D Power supply D Ignition switch-IG D Ignition switch-ST D A/C switch D A/C load signal D Power steering fluid pressure switch D Alternator FR terminal D Vehicle speed sensor

L6 Camshaft position sensor

Engine-A/T-ECU

L5 Throttle position

sensor

l1 Injector l2 Idle speed control servo

(Stepper motor)

l3 EGR control solenoid valve l4 Purge control solenoid valve

D Engine control relay D Fuel pump relay D A/C compressor relay D Ignition coil D Fan controller D Air flow sensor filter reset signal D Engine warning lamp D Diagnosis output D Alternator G terminal D Oxygen sensor (front) heater D Oxygen sensor (rear) heater D Tachometer

L4 Intake air temperature sensor

l2 Idle speed control servo

(Stepper motor)

L3 Air flow sensor

L8 Barometric

pressure sensor

Fuel pressure regulator

To fuel tank

L1 Oxygen sensor

(front)

Catalytic converter

From fuel pump

l1 Injector

L9 Engine coolant

temperature sensor

L10 Detonation sensor

L7 Crank angle sensor L2 Oxygen sensor (rear)

Catalytic converter

EGR valve

l3 EGR control

solenoid valve

Air

Canister

l4 Purge control

solenoid valve

13D-6

20_C)

MPI <4G63> ï Service Specifications/Sealant

SERVICE SPECIFICATIONS

Items Specifications

Basic idle speed r/min 750 r 50

Throttle position sensor adjusting voltage mV 535 ï 735

Throttle position sensor resistance k: 3.5 ï 6.5

Idle speed control servo coil resistance (at 20_C) : 28 ï 33

Intake air temperature sensor resistance

Engine coolant temperature sensor resistance

Oxygen sensor output voltage (at racing) V 0.6 ï 1.0

Oxygen sensor heater resistance(a

ï20_C 13 ï 17

0_C 5.3 ï 6.7

20_C 2.3 ï 3.0

40_C 1.0 ï 1.5

60_C 0.56 ï0.76

80_C 0.30 ï 0.42

ï20_C 14 ï 17

0_C 5.1 ï 6.5

20_C 2.1 ï 2.7

40_C 0.9 ï 1.3

60_C 0.48 ï 0.68

80_C 0.26 ï 0.36

front 4.5 ï 8.0

rear 11 ï 18

Fuel pressure kPa Vacuum hose disconnection 324 ï 343 at kerb idle

Vacuum hose connection Approximately 265 at kerb idle

Injector coil resistance (at 20_C) : 10.5 ï 13.5

SEALANT

Item Specified sealant Remark

Engine coolant temperature sensor threaded portion

3M Nut Locking Part No. 4171 or equivalent Drying sealant

MPI <4G63> ï Special Tools

SPECIAL TOOLS

Too l Number Name Use

13D-7

MB991502 M.U.T.-II sub

assembly

MB991955 A: MB991824 B: MB991827 C: MB991910 D: MB991911 E: MB991825 F: MB991826 M.U.T.-III sub

assembly A: Vehicle com-

munication interface (V.C.I.)

B: M.U.T.-III USB cable

C: M.U.T.-III main harness A (Vehicles with CAN communication system)

D: M.U.T.-III main harness B (Vehicles without CAN communication system)

E: M.U.T.-III measurement adapter

F: M.U.T.-III trigger harness

M.U.T.-III sub assembly

D Reading diagnosis code D MPI system inspection D Measurement of fuel pressure

MB991348 Test harness set D Inspection using an oscilloscope

13D-8

Too l Us eNameNumber

MB991709 Test harness D Measurement of voltage during

MPI <4G63> ï Special Tools

troubleshooting

D Inspection using an oscilloscope D Check of idle speed control servo

MD998478 Test harness

(3-pin, triangle)

MB991536 Check harness for

throttle position sensor adjustment

MD998464 Test harness

(4-pin, square)

MB991658 Test harness D Measurement of voltage during

D Measurement of voltage during

Troubleshooting

D Inspection using an oscilloscope

D Measurement of voltage during

Troubleshooting

D Adjusting of throttle position sensor

D Measurement of voltage during

Troubleshooting

D Inspection of oxygen sensor (front)

Troubleshooting

D Inspection of oxygen sensor (rear)

MB991223 A: MB991219 B: MB991220 C: MB991221 D: MB991222

Harness set A: Test harness B: LED harness C: LED harness

adapter

D: Probe

D Check at the ECU terminals A: Connector pin contact pressure inspection B: Power circuit inspection C: Power circuit inspection D: Commercial tester connection

Too l Us eNameNumber

MD998709 Adaptor hose Measurement of fuel pressure

MD998742 Hose adaptor

MB991637 Fuel pressure

MB991981 Fuel pressure

MPI <4G63> ï Special Tools

gauge set

13D-9

MB992076 Injector test set Checking the spray condition of injectors

MB991607 Injector test

harness

MD998741 Injector test

adaptor

MB991976 Injector test holder

assembly

13D-10

MPI <4G63> ï Troubleshooting

Engine warning lamp (check engine lamp)

Engine warning lamp inspection items

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

Refer to GROUP 00 ï How to Use Troubleshooting/Inspection Service Point.

NOTE If the engine-A/T-ECU is replaced, ring antenna with built in immobilizer-ECU should be replaced, ignition key can be kept, but must be registered.

DIAGNOSIS FUNCTION

ENGINE WARNING LAMP (CHECK ENGINE LAMP)

If an abnormality occurs in any of the following items related to the MPI system, the engine warning lamp will illuminate or flash. If the lamp remains illuminated or if the lamp illuminates while the engine is running, check the diagnosis code output. However, the warning lamp will illuminate as bulb check for five seconds whenever the ignition switch is turned to the ON position.

Engine-A/T-ECU

Oxygen sensor (front)

Air flow sensor

Intake air temperature sensor

Throttle position sensor

Engine coolant temperature sensor

Crank angle sensor

Camshaft position sensor

Barometric pressure sensor

Detonation sensor

Ignition coil, power transistor unit

Injector

Immobilizer system

Oxygen sensor (rear)

NOTE If the engine warning lamp illuminates because of a malfunction of the engine-A/T-ECU, communication between M.U.T.-II/III and the engine-A/T-ECU is impossible. In this case, the diagnosis code cannot be read.

MPI <4G63> ï Troubleshooting

METHOD OF READING AND ERASING DIAGNOSIS CODES

Refer to GROUP 00 ï How to Use Troubleshooting/Inspection Service Points.

INSPECTION USING M.U.T.-II/III DATA LIST AND ACTUATOR TESTING

1. Carry out inspection by means of the data list and the actuator test function. If there is an abnormality, check and repair the chassis harnesses and components.

2. After repairing, re-check using the M.U.T.-II/III and check that the abnormal input and output have returned to normal as a result of the repairs.

3. Erase the diagnosis code memory.

4. Remove the M.U.T.-II/III, and then start the engine again and carry out a road test to confirm that the problem has disappeared.

13D-11

FAIL-SAFE FUNCTION REFERENCE TABLE

When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled by means of the pre-set control logic to maintain safe conditions for driving.

Malfunctioning item Control contents during malfunction

Air flow sensor 1. Uses the throttle position sensor signal and engine speed signal (crank angle sensor

signal) to take reading of the basic injector drive time and basic ignition timing from the pre-set mapping.

2. Fixes the ISC servo in the appointed position so idle control is not performed.

Intake air temperature sensor

Throttle position sensor (TPS)

Engine coolant temperature sensor

Camshaft position sensor

Barometric pressure sensor

Controls as if the intake air temperature is 25_C.

No increase in fuel injection amount during acceleration due to the throttle position sensor signal.

Controls as if the engine coolant temperature is 80_C.

Injects fuel into the cylinders in the order 1-3-4-2 with irregular timing. (However, after the ignition switch is turned to ON, the No. 1 cylinder top dead centre is not

detected at all.)

Controls as if the barometric pressure is 101 kPa.

Detonation sensor Switches the ignition timing from ignition timing for super petrol to ignition timing for standard

petrol.

Ignition coil, power transistor

Alternator FR terminal Does not control the output of the alternator according to an electrical load. (works as a

Cuts off the fuel supply to cylinders with an abnormal ignition.

normal alternator)

13D-12

MPI <4G63> ï Troubleshooting

INSPECTION CHART FOR DIAGNOSIS CODES

Code No. Diagnosis item Reference page

11 Oxygen sensor (front) system 13D-13

12 Air flow sensor system 13D-15

13 Intake air temperature sensor system 13D-16

14 Throttle position sensor system 13D-18

21 Engine coolant temperature sensor system 13D-20

22 Crank angle sensor system 13D-22

23 Camshaft position sensor system 13D-23

24 Vehicle speed signal system 13D-25

25 Barometric pressure sensor system 13D-26

31 Detonation sensor system 13D-28

41 Injector system 13D-29

44 Ignition coil (power transistor) system 13D-30

54 Immobilizer system 13D-31

59 Oxygen sensor (rear) system 13D-32

64 Alternator FR terminal system 13D-34

NOTE

1. Do not replace the engine-A/T-ECU until a through terminal check reveals there are no short/open circuit.

2. Check that the engine-A/T-ECU earth circuit is normal before checking for the cause of the problem.

MPI <4G63> ï Troubleshooting

INSPECTION PROCEDURE FOR DIAGNOSIS CODE

Code No. 11 Oxygen sensor (front) system Probable cause

Range of Check

D More than 3 minutes passed after completion of start of engine D The engine coolant temperature is approximately more than 80_C. D Intake air temperature 0 ï 55_C. D The engine speed is more than 1,800 ï 3,500 r/min. D The volumetric efficiency is 16 ï 60% or more.

Set Conditions D For 30 seconds, the oxygen sensor output voltage continues to be 0.5 V or

lower, or 0.5 V or higher.

D The Engine-A/T-ECU monitors for this condition once during the drive cycle.

D Malfunction of the oxygen sensor (front) D Oxygen sensor (front) circuit disconnection,

short-circuit, or connector contact defect.

D Malfunction of the engine-A/T-ECU

13D-13

M.U.T.-II/III Data list

D No. 11 Oxygen sensor (front)

(Refer to P.13D-66.)

Check the following connector:

B-17

Measure at the B-17 oxygen sensor (front) connector. D Disconnect connector to measure

at the harness side

D Resistance between terminal No.

2 and earth. OK: Less than 2 :

Measure at the B-17 oxygen sensor (front) connector. D Using the test harness

(MD998464), connect the connector, and measure at the pickup harness.

D Engine: After warm-up (1) Voltage between terminal No. 2

and earth OK: Less than 0.5 V

(2) Voltage between terminal No. 4

and the earth

D At rapid deceleration from 4,000

r/min OK: 200 mV or less

D During rapid racing

OK: 600 ï 1,000 mV

To the next page

(1) NG

(2) NG

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Check the following connector:

C-124

Check the harness between the oxygen sensor (front) and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 11 Oxygen sensor (front)

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Check the following connector:

C-124

Check the harness between the oxygen sensor (front) and engine-A/T-ECU.

Check the oxygen sensor (front). (Refer to P.13D-99.)

Check the following connector:

C-126

Check the harness between the oxygen sensor (front) and engine-A/T-ECU.

Repair

Replace the engine-A/T-ECU.

Repair

Replace the oxygen sensor (front).

Repair

13D-14

From the previous page

Measure at the C-126 engine-A/T-ECU connector. D Measure the engine-A/T-ECU

terminal voltage.

D Engine: After warm-up D Voltage between terminal No. 71

and earth.

D At rapid deceleration from 4,000

r/min OK: 200 mV or less

D During rapid racing

OK: 600 ï 1,000 mV

Check the following connectors:

C-124, C-126

M.U.T.-II/III Data list

D No. 11 Oxygen sensor (front)

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

MPI <4G63> ï Troubleshooting

Check the following connector:

C-126

Check and repair the harness between the oxygen sensor (front) and engine-A/T-ECU.

Repair

Replace the engine-A/T-ECU.

Repair

MPI <4G63> ï Troubleshooting

Code No. 12 Air flow sensor system Probable cause

Range of Check D The engine speed is more than 500 r/min Set Condition

D The sensor output frequency is less than 3.3 Hz for 4 seconds.

D Malfunction of the air flow sensor D Air flow sensor circuit disconnection, short-circuit,

or connector contact defect

D Malfunction of the engine-A/T-ECU

13D-15

M.U.T.-II/III Data list

D No. 12 Air flow sensor

(Refer to P.13D-66.)

Check the following connector:

B-08

Measure at the B-08 air flow sensor connector. D Disconnect the connector to

measure at the harness side

(1) Voltage between terminal No. 3

and earth (Ignition switch: ON) OK: 4.9 ï 5.1 V

(2) Voltage between terminal No. 4

and earth (Ignition switch: ON) OK: System voltage

(3) Resistance between terminal No.

5 and earth OK: Less than 2 :

(1) NG

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Measure at the C-124 engine-A/T-ECU connector. D Measure the voltage of the

engine-A/T-ECU terminal.

D Ignition switch: ON D Voltage between terminal No. 65

and earth. OK: 4.9 ï 5.1 V

Check the following connector:

C-124

Check the harness between the air flow sensor and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 12 Air flow sensor

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Check the following connector:

C-124

Check and repair the harness between the air flow sensor and engine-A/TECU.

Repair

Replace the engine-A/T-ECU.

Repair

To the next page

(2) NG

(3) NG

Check the following connector:

B-16X

Check the harness between the air flow sensor and engine control relay.

Check the following connector:

C-122

Check the harness between the air flow sensor and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 12 Air flow sensor

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Replace the engine-A/T-ECU.

13D-16

From the previous page

Measure at the B-08 air flow sensor connector. D Using the test harness

(MB991709), connect the connector, and measure at the pickup.

D Ignition switch: ON D Voltage between terminal No. 7

and earth. OK: 7 ï 8V

MPI <4G63> ï Troubleshooting

Check the following connector:

C-122

Check the harness between the air flow sensor and engine-A/T-ECU.

Replace the air flow sensor.

Repair

Measure at the B-08 air flow sensor connector. D Using the test harness

(MB991709), connect the connector, and measure at the pickup harness.

D Voltage between terminal No. 7

and earth. OK: Engine: idle

0 ï 1V Engine: 3,000 r/min 6 ï 9V

Measure the output waveform at the B-08 air flow sensor connector (using an analyzer). D Using the test harness

(MB991709), connect the connector, and measure at the pickup harness.

D Engine: Idle D Voltage between terminal No. 3

and earth. OK: Output the waveform as

shown on P.13D-79 (inspection procedure by analyzer), and check that there is noise in the output waveform.

Check the following connector:

C-122

Check the harness between air flow sensor and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 12 Air flow sensor

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Replace the air flow sensor.

Check the trouble symptom.

Check the following connectors:

B-16X, C-122, C-124

Check the harness between the air flow sensor and engine control relay.

Check the harness between the air flow sensor and engine-A/T-ECU.

Repair

Replace the engine-A/T-ECU.

End

Repair

M.U.T.-II/III Data list

D No. 12 Air flow sensor

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Replace the engine-A/T-ECU.

Code No. 13 Intake air temperature sensor system Probable cause

Range of Check D 60 seconds after the ignition switch is set to the “ON” position, or after the

completion of the start of engine.

Set Conditions D The sensor output voltage is more than 4.6 V for 4 seconds (Equivalent to intake

air temperature less than ï40_C)

or D The sensor output voltage is less than 0.2 V for 4 seconds (Equivalent to intake

air temperature of more than 120_C)

D Malfunction of the intake air temperature sensor D Intake air temperature sensor circuit disconnection,

short-circuit, or connector contact defect

D Malfunction of the engine-A/T-ECU

MPI <4G63> ï Troubleshooting

13D-17

M.U.T.-II/III Data list

D No. 13 Intake air temperature

sensor OK: Ambient temperature (More

or less the same as the air temperature)

Check the following connector:

B-08

Check the intake air temperature sensor alone. (Refer to P.13D-97.)

Measure at the B-08 air flow sensor connector. D Disconnect the connector to

measure at the harness side

(1) Resistance between terminal No.

5 and earth OK: Less than 2 :

(2) Voltage between terminal No. 6

and earth (Ignition switch: ON) OK: 4.5 ï 4.9 V

(1) NG

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Replace the intake air temperature sensor.

Check the following connector:

C-122

Check the harness between the air flow sensor and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 13 Intake air temperature

sensor OK: Ambient temperature (More

or less the same as the air temperature)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Replace the engine-A/T-ECU.

To the next page

(2) NG

Measure at the C-124 engine-A/T-ECU connector. D Measure the engine-A/T-ECU

terminal voltage.

D Disconnect the B-08 air flow

sensor connector.

D Ignition switch: ON D Voltage between terminal No. 64

and earth. OK: 4.5 ï 4.9 V

Check the following connector:

C-124

Check the harness between the air flow sensor and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 13 intake air temperature

sensor OK: Ambient temperature (More

or less the same as air temperature)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Check the following connector:

C-124

Check and repair the harness between the air flow sensor and engine-A/TECU.

Repair

Replace the engine-A/T-ECU.

Repair

13D-18

From the previous page

Measure at the B-08 air flow sensor connector. D Using the test harness

(MB991709), connecting only connector terminals No. 5 and No. 6, and measure at the pickup harness.

D Ignition switch: ON D Voltage between terminal No. 6

and earth. OK: Ambient temperature ï20_C

3.8 ï 4.4 V Ambient temperature 0_C

3.2 ï 3.8 V Ambient temperature 20_C

2.3 ï 2.9 V Ambient temperature 40_C

1.5 ï 2.1 V Ambient temperature 60_C

0.8 ï 1.4 V Ambient temperature 80_C

0.4 ï 1.0 V

M.U.T.-II/III Data list

D No. 13 intake air temperature

sensor OK: Ambient temperature (More

or less the same as the air temperature)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

MPI <4G63> ï Troubleshooting

Check the following connectors:

C-122, C-124

Check and repair the harness between the air flow sensor and engine-A/TECU.

Replace the engine-A/T-ECU.

Repair

Code No. 14 Throttle position sensor system Probable cause

Range of Check D 60 seconds after the ignition switch is set to the “ON” position, or after the

completion of start of engine.

Set Conditions D The sensor output voltage is 4.3 V or more for 4 seconds and volumetric

efficiency 40 % or less.

or D The sensor output voltage is 0.2 V or less for 2 seconds

M.U.T.-II/III Data list

14 Throttle position sensor

(Refer to P.13D-66, DATA LIST REFERENCE TABLE.)

Check the throttle position sensor. (Refer to P.13D-98.)

Check the following connector:

B-06

To the next page

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Replace

Repair

D Malfunction of the throttle position sensor D Improper connector contact, open circuit or

short-circuited harness wire

D Malfunction of the engine-A/T-ECU

From the previous page

Measure at throttle position sensor connector B-06. D Disconnect the connector and

measure at the harness side.

(1) Voltage between terminal 1 and

earth (Ignition switch: ON) OK: 4.9 ï 5.1 V

(2) Resistance between terminal 4

and earth

OK: 2 : or less

MPI <4G63> ï Troubleshooting

(1) NG

Measure at engine-A/T-ECU connector C-124. D Measure the voltage at the

engine-A/T-ECU terminals.

D Ignition switch: ON D Voltage between terminal 46 and

earth OK: 4.9 ï 5.1 V

Check the following connector:

C-124

Check the harness wire between the throttle position sensor and the engine-A/T-ECU.

Check the trouble symptoms.

13D-19

Check the following connector:

C-124

Check the harness wire between the throttle position sensor and the engine-A/T-ECU, and repair if necessary.

Repair

Replace the engine-A/T-ECU.

Repair

Measure at throttle position sensor connector B-06. D Use test harness (MB991536) to

connect the connector, and measure at the pick-up harness.

D Ignition switch: ON (1) Voltage between terminal 1 and

earth OK: 4.9 ï 5.1 V

(2) Voltage between terminal 4 and

earth OK: 0.5 V or less

(3) Voltage between terminal 2 and

earth OK: Accelerator pedal fully re-

leased: 0.335 ï 0.935 V Accelerator pedal fully depressed: 4.4 ï 5.3 V

To the next page

(2) NG

(1) NG

(2) NG

(3) NG

Check the following connector:

C-124

Check the harness wire between the throttle position sensor and the engine-A/T-ECU.

Check the trouble symptoms.

Check the following connector:

C-124

Check the harness wire between the throttle position sensor and the engine-A/T-ECU.

Adjust the throttle position sensor. (Refer to P.13D-98.)

Check the following connector:

C-126

Check the harness wire between the throttle position sensor and the engine-A/T-ECU, and repair if necessary.

Repair

Replace the engine-A/T-ECU.

Repair

13D-20

From the previous page

Measure at the engine-A/T-ECU connector C-126 D Measure voltage at the

engine-A/T-ECU terminal.

D Ignition switch: ON D Voltage between terminal 78 and

earth OK: Accelerator pedal fully re-

leased: 0.335 ï 0.935 V Accelerator pedal fully depressed: 4.4 ï 5.3 V

MPI <4G63> ï Troubleshooting

Check the following connector:

C-126

Check the harness wire between the throttle position sensor and the engine-A/T-ECU, and repair if necessary.

Check the following connectors:

C-124, C-126

Check the trouble symptoms.

Replace the engine-A/T-ECU.

Code No. 21 Engine coolant temperature sensor system Probable cause

Range of Check D 60 seconds after the ignition switch is set to the “ON” position, or after the

completion of start of engine.

Set Conditions D The sensor output voltage is 4.6 V or more for 4 seconds (equivalent to

ï45_C or lower of engine coolant temperature)

or D The sensor output voltage is 0.1 V or less for 4 seconds (equivalent to

140_C or higher of engine coolant temperature)

Range of Check D Engine: After starting Set Condition D The engine coolant temperature has reduced from over 40_C to less than

40_C, and that condition has lasted for five minutes or more.

D Malfunction of the engine coolant temperature

sensor

D Open or short circuit in the engine coolant

temperature sensor circuit or loose connector contact

D Malfunction of the engine-A/T-ECU

Repair

M.U.T.-II/III Data list

21 Engine coolant temperature

sensor OK: When the engine is cold,

the temperature is roughly the same as ambient temperature. If warm, it is 80 ï 120_C.

Measure at engine coolant temperature sensor connector B-111. D Disconnect the connector and

measure at the sensor side.

D Resistance between terminals 1

and 2 OK: At 20_C of engine coolant

temperature: 2.1 ï 2.7 k: At 80_C of engine coolant temperature:

0.26 ï 0.36 k:

Check the following connector:

B-111

To the next page

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Replace

Repair

From the previous page

Measure at engine coolant temperature sensor connector B-111. D Disconnect the connector and

measure at the harness side.

(1) Voltage between terminal 1 and

earth (Ignition switch: ON) OK: 4.5 ï 4.9 V

(2) Resistance between terminal 2

and earth OK: 2 : or less

MPI <4G63> ï Troubleshooting

(1) NG

(2) NG

Measure at engine-A/T-ECU connector C-124. D Measure the voltage at the

engine-A/T-ECU terminal.

D Disconnect connector B-111. D Ignition switch: ON D Voltage between terminal 44 and

earth OK: 4.5 ï 4.9 V

Check the following connector:

C-124

Check the harness wire between the engine coolant temperature sensor and the engine-A/T-ECU.

Check the trouble symptoms.

Check the following connector:

C-124

Check the harness wire between the engine coolant temperature sensor and the engine-A/T-ECU.

Check the trouble symptoms.

13D-21

Check the following connector:

C-124

Check the harness wire between the engine coolant temperature sensor and the engine-A/T-ECU, and repair if necessary.

Repair

Replace the engine-A/T-ECU.

Repair

Replace the engine-A/T-ECU.

Repair

Measure at engine coolant temperature sensor connector B-111. D Use test harness (MB991658) to

connect the connector, and measure at the pick-up harness.

D Ignition switch: ON D Voltage between terminal 1 and

earth OK: At 0_C of engine coolant

temperature: 3.2 ï 3.8 V At 20_C of engine coolant temperature: 2.3 ï 2.9 V At 40_C of engine coolant temperature: 1.3 ï 1.9 V At 80_C of engine coolant temperature: 0.3 ï 0.9 V

Check the trouble symptoms.

Check the engine coolant temperature sensor. (Refer to P.13D-98.)

Check the following connector:

C-124

Check the harness wire between the engine coolant temperature sensor and the engine-A/T-ECU, and repair if necessary.

Replace the engine-A/T-ECU.

Repair

13D-22

MPI <4G63> ï Troubleshooting

Code No. 22 Crank angle sensor system Probable cause

Range of Check D Engine is cranking Set Condition

D Sensor output voltage does not change for 4 seconds (no pulse signal input).

D Malfunction of the crank angle sensor. D Open or short circuit in the crank angle sensor

circuit or loose connector contact.

D Malfunction of the engine-A/T-ECU

M.U.T.-II/III Data list

22 Crank angle sensor

OK: Refer to P.13D-66, DATA

LIST REFERENCE TABLE.

Check the following connector:

B-116

Measure at the crank angle sensor connector B-116. D Disconnect the connector and

measure at the harness side.

(1) The resistance between terminal

1 and earth OK: 2 : or less

(2) The voltage between terminal 2

and earth (Ignition switch: ON) OK: 4.9 ï 5.1 V

(3) The voltage between terminal 3

and earth (Ignition switch: ON) OK: System voltage

(1) NG

(2) NG

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Check the harness between the crank angle sensor and earth, and repair if necessary.

Measure at the engine-A/T-ECU connector C-124. D Measure the voltage at the

engine-A/T-ECU terminal.

D Disconnect the connector B-116 D Ignition switch: ON D The voltage between terminal 45

and earth OK: 4.9 ï 5.1 V

Check the following connector:

C-124

Check the harness wire between the crank angle sensor and the engine-A/T-ECU.

Check the trouble symptoms.

Check the following connector:

C-124

Check the harness wire between the crank angle sensor and the engine-A/T-ECU, and repair if necessary.

Repair

Replace the engine-A/T-ECU.

Repair

To the next page

(3) NG

Check the following connector:

B-16X

Check the harness wire between the crank angle sensor and the engine control relay, and repair if necessary.

Repair

From the previous page

Use an analyzer to measure the output waveform at the crank angle sensor connector B-116. D Use the test harness

(MD998478) to connect the connector, and measure at the pick-up harness side.

D Engine: Idling D The voltage between terminal 2

and earth OK: A normal waveform should

be displayed as described on P.13D-81 (Inspection Procedure Using an Analyzer). Its maximum value should be 4.8 V or more, and its minimum value should be 0.6 V or less with no noise in waveform.

Check the trouble symptoms.

Replace the engine-A/T-ECU.

MPI <4G63> ï Troubleshooting

Check the crank angle sensor vane.

Replace the crank angle sensor.

Check the trouble symptoms.

Check the following connectors:

B-16X, C-124

Check the harness wires between the crank angle sensor and the engine-A/T-ECU, crank angle sensor and the engine control relay, and the crank angle sensor and earth. Then, repair if necessary.

13D-23

Replace

Repair

13D-24

MPI <4G63> ï Troubleshooting

Code No. 23 Camshaft position sensor system Probable cause

Range of Check D During engine cranking and driving Set Condition D The sensor output voltage does not change for 4 seconds (no pulse signal

input).

D Malfunction of the camshaft position sensor D Open or short circuit in the camshaft position

sensor circuit or loose connector contact.

D Malfunction of the engine-A/T-ECU

Check the following connector:

B-107

Measure at camshaft position sensor connector B-107. D Disconnect the connector and

measure at the harness side.

(1) The voltage between terminal 3

and earth (Ignition switch: ON) OK: System voltage

(2) The voltage between terminal 2

and earth (Ignition switch: ON) OK: 4.9 ï 5.1 V

(3) The resistance between terminal

1 and earth OK: 2 : or less

(1) NG

(2) NG

Repair

Check the following connector:

B-16X

Check the harness wire between the camshaft position sensor connector and the engine control relay, and repair if necessary.

Measure at the engine-A/T-ECU connector C-124. D Measure the voltage at the

engine-A/T-ECU terminal.

D Disconnect connector B-107. D Ignition switch: ON D The voltage between terminal 56

and earth OK: 4.9 ï 5.1 V

Check the following connector:

C-124

Check the harness wire between the intermediate connector and the engine-A/T-ECU.

Check the trouble symptoms.

Repair

Check the following connector:

C-124

Check the harness wire between the camshaft position sensor connector and the engine-A/T-ECU, and repair if necessary.

Repair

Replace the engine-A/T-ECU.

Repair

Use an analyzer to measure the output waveform at camshaft position sensor connector B-107. D Use test harness (MB991709) to

connect the connector, and measure at the pick-up harness.

D Engine: Idling D The voltage between terminal 2

and earth OK: A normal waveform should

be displayed as described on P.13D-81 (Inspection Procedure Using an Analyzer), its maximum value should be 4.8 V or more, and its minimum value should be 0.6 V or less with no noise in waveform.

Check the trouble symptoms.

Replace the engine-A/T-ECU.

(3) NG

Check the harness wire between the camshaft position sensor connector and earth, and repair if necessary.

Check the camshaft position sensing cylinder.

Replace the camshaft position sensor.

Check the trouble symptoms.

Check the following connectors:

B-16X, C-124

Check the harness wires between the camshaft position sensor connector and the engine-A/T-ECU, the camshaft position sensor connector and the engine control relay, and the camshaft position sensor connector and earth. Then, repair if necessary.

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Replace

Repair

MPI <4G63> ï Troubleshooting

Code No. 24 Vehicle speed signal system Probable cause

Range of Check D 60 seconds after the ignition switch is set to the “ON” position, or after the

completion of start of engine.

D The engine speed is more than 2,300 r/min. D Volumetric efficiency 50 % or more

Set Condition D The vehicle speed signal does not change for 4 seconds (no pulse signal

input.)

D Malfunction of the output shaft speed sensor D Open or short circuit in the output shaft speed

sensor circuit or loose connector contact

D Malfunction of the engine-A/T-ECU

13D-25

M.U.T.-II/III Self-Diag code

D Is diagnosis code of automatic transmission system output?

Check the trouble symptoms.

Replace the engine-A/T-ECU.

YES

D Automatic transmission system check

(Refer to GROUP 23B ï Troubleshooting ï Inspection chart for diagnosis codes)

Intermittent malfunction. (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

13D-26

MPI <4G63> ï Troubleshooting

Code No. 25 Barometric pressure sensor system Probable cause

Range of Check D 60 seconds after the ignition switch is set to the “ON” position, or after the

completion of start of engine.

D Battery voltage 8 V or more. Set Conditions D The sensor output voltage is more than 4.5 V for 4 seconds (Equivalent to

air pressure of more than 114 kPa)

or D The sensor output voltage is less than 0.2 V for 4 seconds (Equivalent to air

pressure of less than 5 kPa)

D Malfunction of the barometric pressure sensor D Barometric pressure sensor circuit disconnection,

short-circuit, or connector contact defect

D Malfunction of the engine-A/T-ECU

M.U.T.-II/III Data list

D No. 25 Barometric pressure

sensor (Refer to P.13D-66.)

Check the following connector:

B-08

Measure at the B-08 air flow sensor connector. D Disconnect the connector to

measure at the harness side

(1) Voltage between terminal No. 1

and earth (Ignition switch: ON) OK: 4.9 ï 5.1 V

(2) Resistance between terminal No.

5 and earth. OK: Less than 2 :

(1) NG

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Measure at the C-124 engine-A/T-ECU connector. D Measure the engine-A/T-ECU

terminal voltage.

D Ignition switch: ON D Voltage between terminal No. 46

and earth OK: 4.9 ï 5.1 V

Check the following connector:

C-124

Check the harness between the air flow sensor and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 25 Barometric pressure

sensor (Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Check the following connector:

C-124

Check and repair the harness between the air flow sensor and engine-A/TECU.

Repair

Replace the engine-A/T-ECU.

Repair

To the next page

(2) NG

Check the following connector:

C-122

Check the harness between the air flow sensor and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 25 Barometric pressure

sensor (Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Replace the engine-A/T-ECU.

From the previous page

Measure at the B-08 air flow sensor connector. D Using the test harness

(MB991709), connect only connector terminals No. 1, No. 2, and No. 5, and measure at the pickup harness.

D Ignition switch: ON (1) Voltage between terminal No. 1

and earth OK: 4.9 ï 5.1 V

(2) Voltage between terminal No. 5

and earth OK: Less than 0.5 V

(3) Voltage between terminal No. 2

and earth OK: High 0 m 3.8 ï 4.2 V

High 600 m 3.5 ï 3.9 V

High 1,200 m 3.3 ï 3.7 V

High 1,800 m 3.0 ï 3.4 V

MPI <4G63> ï Troubleshooting

(1) NG

(2) NG

(3) NG

Check the following connector:

C-124

Check and repair the harness between the air flow sensor and engine-A/TECU.

Check the following connector:

C-122

Check and repair the harness between the air flow sensor and engine-A/TECU.

Check the following connector:

C-124

Check the harness between the air flow sensor and engine-A/T-ECU.

Replace the air flow sensor.

13D-27

Repair

Measure at the C-124 engine-A/T-ECU connector. D Measure the engine-A/T-ECU

terminal voltage.

D Ignition switch: ON D Voltage between terminal No. 55

and earth. OK: High 0 m 3.8 ï 4.2 V

High 600 m 3.5 ï 3.9 V High 1,200 m 3.3 ï 3.7 V High 1,800 m 3.0 ï 3.4 V

Check the following connectors:

C-122, C-124

M.U.T.-II/III Data list

D No. 25 Barometric pressure

sensor (Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Check the following connector:

C-124

Check and repair the harness between the air flow sensor and engine-A/TECU.

Repair

Replace the engine-A/T-ECU.

Repair

13D-28

MPI <4G63> ï Troubleshooting

Code No. 31 Detonation sensor system Probable cause

Range of Check D 60 seconds after the ignition switch is set to the “ON” position, or after the

completion of start of engine.

D The engine speed is more than 2,500 r/min. D Volumetric efficiency 30 % or more

Set Condition D Changes in sensor output voltage (detonation sensor peak voltage per 1/2

crankshaft rotation) in 200 consecutive cycles are 0.078 V or less.

D Malfunction of the detonation sensor D Open or short circuit in the detonation sensor

circuit or loose connector contact

D Malfunction of the engine-A/T-ECU

Check the following connector: B-117

Measure at the detonation sensor connector B-117. D Disconnect the connector and measure at the harness

side.

D The resistance between terminal 2 and earth

OK: 2 : or less

Check the following connector: C-126

Check the harness wire between the detonation sensor and the engine-A/T-ECU.

Check the trouble symptoms.

Replace the detonation sensor.

Check the trouble symptoms.

Replace the engine-A/T-ECU.

Repair

Check the harness wire between the detonation sensor and earth, and repair if necessary.

Repair

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

MPI <4G63> ï Troubleshooting

Code No. 41 Injector system Probable cause

Range of Check

D Fuel cut and injector not in forced drive (actuator test) mode. D The engine speed is 50 ï 1,000 r/min D The throttle position sensor output voltage is 1.15 V or less.

Set Condition

D Surge voltage of injector coil is not detected for 4 seconds.

D Malfunction of the injector D Improper connector contact, open circuit or short-cir-

cuited harness wire of the injector circuit

D Malfunction of the engine-A/T-ECU

13D-29

M.U.T.-II/III Actuator Test

01 No. 1 injector 02 No. 2 injector 03 No. 3 injector 04 No. 4 injector

OK: The idling condition should change

Check the following connectors:

B-02, B-03, B-04, B-05

Check the injector. (Refer to P.13D-101.)

Measure at the injector connector B-02, B-03, B-04, B-05.

D Disconnect the connector, and measure at the harness side. D Voltage between 1 and earth (Ignition switch: ON)

OK: System voltage

Check the following connector: C-122

Measure at the engine-A/T-ECU connector C-122.

D Disconnect the connector, and measure at the harness side. D Voltage between 1, 2, 9, 24 and earth (Ignition switch: ON)

OK: System voltage

Check the trouble symptoms.

Use an analyzer to measure the signal waveform at injector connector B-02, B-03, B-04, B-05. D Use a test harness (MB991348) to connect the connector, and

measure at the pick-up harness side.

D Engine: Idling D The voltage between terminal 2 and earth

OK: A normal waveform should be displayed as described

on P.13D-83 (INSPECTION PROCEDURE USING AN ANALYZER).

Replace the engine-A/T-ECU.

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Replace

Check the harness wire between the engine control relay and the injector connector, and repair if necessary.

Repair

Check the harness wire between the engine-A/T-ECU and the injector connector, and repair if necessary.

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

13D-30

MPI <4G63> ï Troubleshooting

Code No. 44 Ignition coil system Probable cause

Range of Check

D The engine speed is 1,500 ï 4,500 r/min D Volumetric efficiency 30 ï 55 % D Fuel cut and injector not in forced drive (actuator test) mode. D The throttle deviation is within the range of ï0.06 V/25 ms to 0.06 V/10 ms. D The coolant temperature is 80_C or higher, and the intake air temperature is ï10_C

or higher.

Set condition D After driven for 250 rotations or more in the above check range, crank angle

sensor detects abnormal rotation caused by misfire (one failed coil of the two coils).

D Malfunction of the ignition coil D Improper connector contact, open circuit or

short-circuited harness wire of the ignition primary circuit

D Malfunction of the spark plug and spark plug cable. D Faulty compression D Malfunction of the engine-A/T-ECU

Check the ignition coil. (Refer to GROUP 16 ï Ignition System.)

Measure at the ignition coil connectors B-104, B-113. D Disconnect the connector, and

measure at the harness side.

(1) Voltage between 1 and earth

(Ignition switch: ON) OK: System voltage

(2) Voltage between 3 and earth

(Engine: Cranking) OK: 0.5 ï 4.0 V

(3) Continuity between 2 and earth

OK: 2 : or less

Check the following connectors:

B-104, B-113

Check the trouble symptom.

Check the following items in order. D Check the spark plug cables, spark

plugs.

D Check the compression pressure.

Replace the ignition coil.

Repair

(1) NG

(2) NG

(3) NG

Replace

Check the following connectors:

A-13, C-27, C-210, C-212

Check the trouble symptom.

Checkthefollowing connector:C-122

Check the trouble symptom.

Check the harness wire between the engine-A/T-ECU and ignition coil connector.

Replace the engine-A/T-ECU.

Check the harness between the ignition coil connector and the earth and repair if necessary.

Repair or Replace

Repair

D Check the harness wire between

the ignition coil and ignition switch connector, and repair if necessary.

Repair

Check the trouble symptom.

Replace the engine-A/T-ECU.

MPI <4G63> ï Troubleshooting

13D-31

Cord No. 54 Immobilizer system Probable cause

Range of Check D Ignition switch: ON Set Condition D Improper communication between the engine-A/T-ECU and the

immobilizer-ECU

D Open or short circuit, or loose connector contact D Malfunction of the immobilizer-ECU D Malfunction of the engine-A/T-ECU

NOTE (1) If the registered ignition keys are close each other when starting the engine, radio interference may

cause this code to be displayed.

(2) This code may be displayed when registering the key encrypted code.

Check the following connectors:

C-13, C-128, C-202

Check the harness wire between the immobilizer-ECU and the engine-A/T-ECU.

Check the trouble symptoms.

Replace the immobilizer-ECU.

Check the trouble symptoms.

Replace the engine-A/T-ECU.

Repair

Replace

13D-32

MPI <4G63> ï Troubleshooting

Code No. 59 Oxygen sensor (rear) system Probable cause

Range of Check

D More than 3 minutes passed after completion of start of engine D The engine coolant temperature is approximately more than 80_C. D Intake air temperature 0 ï 55_C D The engine speed is more than 1,800 ï 3,500 r/min. D The volumetric efficiency is 16 ï 60% or more. D Other than the fuel cut mode D When 0.2 seconds or more of the fuel cut passed, 30 seconds elapsed after

return.

D The air flow sensor output frequency is 81 Hz or more. Set Conditions D When the throttle position sensor is 4.4 V or higher, other than the engine is

idling, and other than in feedback mode, all the following states continue to be true for 5 seconds or more: the oxygen sensor (front) output voltage is

0.5 V or higher; the oxygen sensor (rear) output voltage is less than 0.1 V; and the oxygen sensor (rear) output voltage variation is less than 0.078 V.

D When the air/fuel ratio is forcibly turned to a rich state for 10 seconds, all

the following states continue to be true for 5 seconds or more: the oxygen sensor (front) output voltage is 0.5 V or more; the oxygen sensor (rear) output voltage is less than 0.1 V; and the oxygen sensor (rear) output voltage variation is less than 0.078 V.

D The engine-A/T-ECU monitors for this condition once during the drive cycle.

D Malfunction of the oxygen sensor (rear) D Oxygen sensor (rear) circuit disconnection,

short-circuit, or connector contact defect

D Malfunction of the engine-A/T-ECU

M.U.T.-II/III Data list

D No. 59 Oxygen sensor (rear)

(Refer to P.13D-66.)

Check the following connector:

C-130

Measure at the C-130 oxygen sensor (rear) connector. D Disconnect connector to measure

at the harness side

D Resistance between terminal No.

2 and earth. OK: Less than 2 :

Measure at the C-130 oxygen sensor (rear) connector. D Using the test harness

(MB991658), connect the connector, and measure at the pickup harness.

D Engine: After warm-up (1) Voltage between terminal No. 2

and earth OK: Less than 0.5 V

(2) Voltage between terminal No. 1

and the earth

D During rapid racing

OK: 0 and 600 ï 1,000 mV

alternate.

To the next page

(1) NG

(2) NG

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Repair

Check the following connector:

C-124

Check the harness between the oxygen sensor (rear) and engine-A/T-ECU.

M.U.T.-II/III Data list

D No. 59 Oxygen sensor (rear)

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

Check the following connector:

C-124

Check the harness between the oxygen sensor (rear) and engine-A/T-ECU.

Check the oxygen sensor (rear). (Refer to P.13D-100.)

Check the following connector:

C-126

Check the harness between the oxygen sensor (rear) and engine-A/T-ECU.

Repair

Replace the engine-A/T-ECU.

Repair

Replace the oxygen sensor (rear).

Repair

From the previous page

Measure at the C-126 engine-A/T-ECU connector. D Measure the engine-A/T-ECU

terminal voltage.

D Engine: After warm-up D Voltage between terminal No. 73

and earth.

D During rapid racing

OK: 0 and 600 ï 1,000 mV

alternate.

Check the following connectors:

C-122, C-124, C-126

M.U.T.-II/III Data list

D No. 59 Oxygen sensor (rear)

(Refer to P.13D-66.)

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

MPI <4G63> ï Troubleshooting

Check the following connector:

C-126

Check and repair the harness between the oxygen sensor (rear) and engine-A/T-ECU.

Repair

Replace the engine-A/T-ECU.

13D-33

Repair

13D-34

MPI <4G63> ï Troubleshooting

Code No. 64 Alternator FR terminal system Probable cause

Range of Check D During the engine running. Set Condition D Input voltage from the alternator FR terminal is system voltage for 20

seconds.

D Open circuit in alternator FR terminal circuit D Malfunction of the engine-A/T-ECU

Check the following connector:

B-26

Measure at the alternator connector B-26. D Use test harness (MB991519) to

connect the connector, and measure at the pick-up harness.

D Ignition switch: ON D The voltage between terminal 4

and earth OK: 9 ï 10 V

Measure at the alternator connector B-26. D Use test harness (MB991519) to

connect the connector, and measure at the pick-up harness.

D Engine: Idling (After warming up) D Radiator fan: Not operating D The voltage between terminal 4

and earth OK: The voltage drops when

the headlamps are turned on.

Repair

Measure at the engine-A/T-ECU connector C-124. D Measure the voltage at the

engine-A/T-ECU terminal.

D Ignition switch: ON D The voltage between terminal 54

and earth OK: 9 ï 10 V

Check the following connector:

C-124

Check the harness wire between the alternator connector and the engine-A/T-ECU.

Check the trouble symptoms.

Check the following connectors:

B-18, C-124

Check the harness wire between the alternator connector and the engine-A/T-ECU.

Check the trouble symptoms.

Replace the alternator.

Check the following connectors:

B-18, C-124

Check the harness wire between the alternator connector and the engine-A/T-ECU, and repair if necessary.

Repair

Replace the engine-A/T-ECU.

Replace

Repair

Check the trouble symptoms.

Replace the engine-A/T-ECU.

Intermittent malfunction (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.)

MPI <4G63> ï Troubleshooting

with

M.U.T

II/

idling)

(Engi

)

INSPECTION CHART FOR TROUBLE SYMPTOMS

13D-35

Trouble symptom Inspection

procedure No.

Communication with M.U.T.-II/ III is impossible.

Engine warning lamp and relatedparts

Starting No initial combustion (starting impossible) 5 13D-41

Idling stability

mproper

Communication with all systems is not possible. 1 13D-39

Communication with engine-A/T-ECU only is not possible. 2 13D-39

The engine warning lamp does not illuminate right after the ignition switch is turned to the ON position.

The engine warning lamp remains illuminating and never goes out.

Initial combustion but no complete combustion (starting impossible)

Long time to start (improper starting) 7 13D-43

Unstable idling (Rough idling, hunting) 8 13D-44

Idling speed is high. (Improper idling speed) 9 13D-46

Idling speed is low. (Improper idling speed) 10 13D-46

3 13D-40

4 13D-40

6 13D-42

Reference page

Idling stability

ne stalls

Driving Hesitation, sag or stumble 15 13D-51

Dieseling 21 13D-55

Too high CO and HC concentration when idling 22 13D-56

Low alternator output voltage (approx. 12.3 V) 23 13D-57

Idling speed is improper when A/C is operating 24 13D-57

When the engine is cold, it stalls at idling. (Die out) 11 13D-47

When the engine is hot, it stalls at idling. (Die out) 12 13D-48

The engine stalls when starting the car. (Pass out) 13 13D-50

The engine stalls when decelerating. 14 13D-50

The feeling of impact or vibration when accelerating 16 13D-52

The feeling of impact or vibration when decelerating 17 13D-52

Poor acceleration 18 13D-53

Surge 19 13D-54

Knocking 20 13D-55

Fans (radiator fan, A/C condenser fan) are inoperative 25 13D-58

13D-36

bilit

MPI <4G63> ï Troubleshooting

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

Items Symptom

Starting Won’t start The starter is used to crank the engine, but there is no combustion within the

cylinders, and the engine won’t start.

Fires up and dies There is combustion within the cylinders, but then the engine soon stalls.

Hard starting Engine starts after cranking a while.

Idling sta

Hunting Engine speed doesn’t remain constant; changes at idle.

Rough idle Usually, a judgement can be based upon the movement of the tachometer

pointer, and the vibration transmitted to the steering wheel, shift lever, body, etc. This is called rough idle.

Incorrect idle

The engine doesn’t idle at the usual correct speed.

speed

Engine stall (Die out)

Engine stall (Pass out)

The engine stalls when the foot is taken from the accelerator pedal, regardless of whether the vehicles is moving or not.

The engine stalls when the accelerator pedal is depressed or while it is being used.

Driving Hesitation Sag “Hesitation” is the delay in response of the vehicle speed (engine speed) that

occurs when the accelerator is depressed in order to accelerate from the speed at which the vehicle is now traveling, or a temporary drop in vehicle speed (engine speed) during such acceleration. Serious hesitation is called “sag”. (Refer to Fig. 1)

Poor acceleration Poor acceleration is inability to obtain an acceleration corresponding to the

degree of throttle opening, even though acceleration is smooth, or the inability to reach maximum speed.

Stumble Engine speed increase is delayed when the accelerator pedal is initially

depressed for acceleration. (Refer to Fig. 2)

Shock The feeling of a comparatively large impact or vibration when the engine is

Surge This is repeated surging ahead during constant speed travel or during

Knocking A sharp sound like a hammer striking the cylinder walls during driving and

Stopping Run on

(“Dieseling”)

Fig. 1

Normal

Vehicle speed

Initial accelerator pedal depression

Time

Hesitation

Sag

accelerated or decelerated.

variable speed travel.

which adversely affects driving.

The condition in which the engine continues to run after the ignition switch is turned to LOCK (OFF) position. Also called “Dieseling”.

Fig. 2

Vehicle speed

Normal

Initial accelerator pedal depression

Idling

Stumble

Time

MPI <4G63> ï Troubleshooting

PROBLEM SYMPTOMS TABLE

13D-37

Inspection procedure No.

1 Communication with all system is not possible 13D-39

2 Communication with engine-A/T-ECU only is not possible 13D-39

3 The engine warning lamp does not illuminate right after the ignition switch is turned

4 The engine warning lamp remains illuminating and never goes out 13D-40

5 No initial combustion (Starting impossible) 13D-41

6 Initial combustion but no complete combustion (Starting impossible) 13D-42

7 It takes too long time to start (Incorrect starting) 13D-43

8 Unstable idling (Rough idling, hunting) 13D-44

9 Idling speed is high (Improper idling speed) 13D-46

10 Idling speed is low (Improper idling speed) 13D-46

11 When the engine is cold, it stalls at idling (Die out) 13D-47

12 When the engine is hot, it stalls at idling (Die out) 13D-48

Trouble symptom Reference

page

13D-40

to the “ON” position

13 The engine stalls when starting the car (Pass out) 13D-50

14 The engine stalls when decelerating 13D-50

15 Hesitation, sag or stumble 13D-51

16 The feeling of impact or vibration when accelerating 13D-52

17 The feeling of impact or vibration when decelerating 13D-52

18 Poor acceleration 13D-53

19 Surge 13D-54

20 Knocking 13D-55

21 Dieseling 13D-55

22 Too high CO and HC concentration when idling 13D-56

23 Low alternator output voltage (approx. 12.3 V) 13D-57

24 Idling speed is improper when A/C is operating 13D-57

25 Fans (radiator fan, A/C condenser fan) are inoperative 13D-58

26 Check the engine-A/T-ECU power supply and earth circuit 13D-59

27 Power supply system and ignition switch-IG system 13D-59

28 Fuel pump system 13D-60

29 Ignition switch-ST and inhibitor switch system 13D-62

30 Power steering fluid pressure switch system 13D-63

13D-38

MPI <4G63> ï Troubleshooting

Inspection procedure No.

31 A/C switch and A/C relay system 13D-63

32 Idle speed control (ISC) servo (Stepper motor) system 13D-64

33 Purge control solenoid valve system 13D-65

34 EGR control solenoid valve system 13D-65

Trouble symptom

Reference page

MPI <4G63> ï Troubleshooting

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

INSPECTION PROCEDURE 1

13D-39

Communication with M.U.T.-II/III is not possible. (Communication with all systems is not possible.)

The cause is probably a defect in the power supply system (including earth) for the diagnosis line.

Measure at the diagnosis connector (16-pin) C-11. D Voltage between 16 and earth

OK: System voltage

Measure at the diagnosis connector (16-pin) C-11.

D Continuity between 4 and earth D Continuity between 5 and earth

OK: Continuity

Replace the M.U.T.-II/III.

Check the following connectors:

C-212, C-211, C-21

Check the trouble symptom.

Check the harness wire between the diagnosticconnector(16-pin)andearth, and repair if necessary.

INSPECTION PROCEDURE 2

M.U.T.-II/III communication with engine-A/T-ECU is impossible.

One of the following causes may be suspected:

D No power supply to engine-A/T-ECU. D Defective earth circuit of engine-A/T-ECU. D Defective engine-A/T-ECU. D Improper communication line between engine-A/T-ECU and M.U.T.-II/III

Probable cause

D Malfunction of the connector D Malfunction of the harness wire

Repair

Check the harness wire between the power supply and diagnostic connector (16 pin), and repair if necessary.

Probable cause

D Malfunctionof the engine-A/T-ECUpowersupply circuit D Malfunction of the engine-A/T-ECU D Open circuit between engine-A/T-ECU and diagnosis

connector

Check the following connectors: C-11, C-32, C-13, C-126

Check the trouble symptom.

Check the harness wire between engine-A/T-ECU and diagnosis connector.

Repair

Check the harness wire betweenengine-A/T-ECU and earth.

Check the power supply system and ignition switch-IG system. (Refer to P.13D-59, INSPECTION PROCEDURE 27.)

Repair

13D-40

INSPECTION PROCEDURE 3

MPI <4G63> ï Troubleshooting

The engine warning lamp does not illuminate right after the ignition switch is turned to the ON position.

Because there is a burnt-out bulb, the engine-A/T-ECU causes the engine warning lamp to illuminate for five seconds immediately after the ignition switch is turned to ON. If the engine warning lamp does not illuminate immediately after the ignition switch is turned to ON, one of the malfunctions listed at right has probably occurred.

M.U.T.-II/III Data list

16 Engine-A/T-ECU power supply voltage (Refer to P.13D-66.)

Measure at the engine-A/T-ECU connector C-122.

D Disconnect the connector, and measure at the harness side. D Earth the terminal No. 22.

OK: The engine warning lamp illuminates.

Check a burnt-out bulb.

Measure at the combination meter connector C-04.

D Disconnect the connector, and measure at the harness side. D Voltage between 9 and earth (Ignition switch: ON)

OK: System voltage

Check the following connectors:

C-13, C-122

Check the trouble symptom.

Replace

Check the engine-A/T-ECU power supply and earth circuit. (Refer to P.13D-59, INSPECTION PROCEDURE 26.)

Check the following connector: C-122

Check the trouble symptom.

Replace the engine-A/T-ECU.

Check the following connectors: C-03,

C-212, C-210

Check the trouble symptom.

Check the engine warning lamp power supply circuit, and repair if necessary.

Repair

Checkthe harnesswirebetweencombinationmeter andengine-A/TECU, and repair if necessary.

Probable cause

D Burnt-out bulb D Defective warning lamp circuit D Malfunction of the engine-A/T-ECU

Repair

INSPECTION PROCEDURE 4

The engine warning lamp remains illuminating and never goes out.

In cases such as the above, the cause is probably that the engine-A/T-ECU is detecting a problem in a sensor or actuator, or that one of the malfunctions listed at right has occurred.

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Measure at the combination meter connector C-04.

D Disconnect the connector, and measure at the harness side. D Disconnect the engine-A/T-ECU connector D Continuity between 17 and earth

OK: No continuity

Replace the engine-A/T-ECU.

YES

Probable cause

D Short-circuit between the engine warning lamp and

engine-A/T-ECU

D Malfunction of the engine-A/T-ECU

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES

Checkthe harnesswirebetweencombinationmeter andengine-A/TECU connector, and repair if necessary.

INSPECTION PROCEDURE 5

MPI <4G63> ï Troubleshooting

13D-41

No initial combustion (starting impossible)

In cases such as the above, the cause is probably that a spark plug is defective, or that the supply of fuel to the combustion chamber is defective. In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.

Check battery voltage when cranking.

OK: 8 V or higher

Is an immobilizer-ECU diagnosis code displayed?

M.U.T.-II/III Data list

16 Engine-A/T-ECU power supply voltage (Refer to P.13D-66.)

Does the camshaft rotate at the engine cranking? (When oil filler cap is removed.)

YES

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

M.U.T.-II/III Data list

22 Crank angle sensor

OK: Cranking speed is displayed.

M.U.T.-II/III Actuator test

07 Fuel pump (Refer to P.13D-70)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

Can any sound be heard from the injectors when cranking?

Does the engine tachometer display the cranking speed? D Set the tachometer of primary voltage detection type.

Check the ignition timing when cranking.

OK: Approx. 5_ BTDC

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check if the injectors are clogged. D Check if foreign materials (water, alcohol, etc.) got into fuel. D Check the compression pressure. D Check the immobilizer system.

YES

Check the battery. (Refer to GROUP 54 ï Battery.)

Check the immobilizer. (Refer to GROUP 54 ï Ignition Key and Immobilizer.)

Check the power supply system and ignition switch-IG system. (Refer to P.13D-59, INSPECTION PROCEDURE 27.)

Check timing belt for breakage.

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the crank angle sensor system. (RefertoP.13D-56, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 22.)

Check the fuel pump system. (Refer to P.13D-60, INSPECTION PROCEDURE 28.)

Check the engine coolant temperature sensor system. (Refer to P.13D-20, INSPECTION PROCEDURE FOR DIAGNOSIS CODE

21.)

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check the ignition coil system. (Refer to P.13D-30, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 44.)

Check that the crank angle sensor is installed properly.

Probable cause

D Malfunction of the ignition system D Malfunction of the fuel pump system D Malfunction of the injectors D Malfunction of the engine-A/T-ECU D Malfunction of the immobilizer system <Australia> D Foreign materials in fuel

13D-42

INSPECTION PROCEDURE 6

MPI <4G63> ï Troubleshooting

Initial combustion but no complete combustion (starting impossible)

In such cases as the above, the cause is probably that the spark plugs are generating sparks but the sparks are weak, or the initial mixture for starting is not appropriate.

Check battery voltage when cranking.

OK: 8 V or higher

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

M.U.T.-II/III Actuator test

07 Fuel pump (Refer to P.13D-70)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

18 Ignition switch-ST (Refer to P.13D-66.)

YES

Check the battery. (Refer to GROUP 54 ï Battery.)

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the fuel pump system. (Refer to P.13D-60, INSPECTION PROCEDURE 28.)

Check the engine coolant temperature sensor system. (Referto P.13D-55,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the ignition switch-ST and inhibitor switch system (Refer to P.13D-62, INSPECTION PROCEDURE 29.)

Probable cause

D Malfunction of the ignition system D Malfunction of the injector system D Foreign materials in fuel D Poor compression D Malfunction of the engine-A/T-ECU

Can any sound be heard from the injectors when cranking?

Is starting good if the engine is cranked with the accelerator pedal slightly depressed?

Check the ignition timing when cranking.

OK: Approx. 5_BTDC

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check if the injectors are clogged. D Check the compression pressure. D Check fuel lines for clogging. D Check if foreign materials (water, alcohol, etc.) got into fuel.

YES

Check the injector system, (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check ISC servo for operation sound. (Refer to P.13D-102.)

Clean the throttle valve area. (Refer to P.13D-90.)

Check that the crank angle sensor is installed properly.

Check the ISC servo system. (Refer to P.13D-64, INSPECTION PROCEDURE 32.)

INSPECTION PROCEDURE 7

MPI <4G63> ï Troubleshooting

13D-43

It takes too long time to start. (Incorrect starting)

In cases such as the above, the cause is probably that the spark is weak and ignition is difficult, the initial mixture for starting is not appropriate, or sufficient compression pressure is not being obtained.

Check battery voltage when cranking

OK: 8 V or higher

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

M.U.T.-II/III Actuator test

07 Fuel pump (Refer to P.13D-70)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

18 Ignition switch-ST (Refer to P.13D-66.)

Can any sound be heard from the injectors when cranking?

Check the ignition timing when cranking.

OK: Approx. 5_BTDC

YES

Check the battery. (Refer to GROUP 54 ï Battery.)

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the fuel pump system. (Refer to P.13D-60, INSPECTION PROCEDURE 28.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

D Check the ignition switch-ST and inhibitor switch system.

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check that the crank angle sensor is installed properly.

Probable cause

D Malfunction of the ignition system D Malfunction of the injector system D Inappropriate gasoline use D Poor compression

(Refer to P.13D-62, INSPECTION PROCEDURE 29.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check if the injectors are clogged. D Check the compression pressure. D Check if foreign materials (water, alcohol, etc.) got into fuel.

13D-44

INSPECTION PROCEDURE 8

MPI <4G63> ï Troubleshooting

Unstable idling (Rough idling, hunting)

In cases as the above, the cause is probably that the ignition system, air/fuel mixture, idle speed control (ISC) or compression pressure is defective. Because the range of possible causes is broad, inspection is narrowed down to simple items.

Were the battery terminals disconnected?

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Does idling speed fluctuate excessively?

Check the ISC servo for operation sound. (Refer to P.13D-102.)

Check the injector for operation sound.

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

13 Intake air temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

25 Barometric pressure sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Actuator test

08 Purge control solenoid valve (Refer to P.13D-70.)

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

YES

After warming-up, let the engine run at idling for 10 minutes.

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

D Check the throttle valve area. (Refer to P.13D-90.)

Check the trouble symptom.

Inspect the intake of air into the air intake system.

D Broken intake manifold gasket D Broken air intake hose D Broken vacuum hose D Positive crankcase ventilation valve does not operate.

Check the ISC servo system. (Refer to P.13D-64, INSPECTION PROCEDURE 32.)

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check the throttle position sensor system. (Refer to P.13D-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

Check the intake air temperature sensor system. (Referto P.13D-16,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 13.)

Check the barometric pressure sensor system. (Refer to P.13D-26, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 25.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the purge control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 33)

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

Probable cause

D Malfunction of the ignition system D Malfunction of the air-fuel ratio control system D Malfunction of the ISC system D Malfunction of the purge control solenoid valve system D Malfunction of the EGR solenoid valve system D Poor compression D Drawing air into exhaust system

To the next page

MPI <4G63> ï Troubleshooting

From the previous page

M.U.T.-II/III Data list

59 Oxygen sensor (rear)

D Transmission: D range D Driving with throttle widely open

OK: 600 ï 1,000 mV

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: 600 ï 1,000 mV during sudden racing

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: Changes between 0 ï 400 mV and 600 ï 1,000 mV during

idling

M.U.T.-II/III Data list

27 Power steering fluid pressure switch (Refer to P.13D-66.)

13D-45

Check the oxygen sensor (rear) system. (Referto P.13D-32,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 59.)

Check the oxygen sensor (front) system. (Referto P.13D-13,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 11.)

Check the fuel pressure. (Refer to P.13D-92.)

Check the power steering fluid pressure switch system. (Refer to P.13D-63, INSPECTION PROCEDURE 30.)

1. Inspect the intake of air into the air intake system.

D Broken intake man-

ifold gasket

D Broken vacuum hose D PCV valve does not

operate.

D Brokenairintakehose

2. Check the injector for clog.

M.U.T.-II/III Data list

28 A/C switch (Refer to P.13D-66.)

M.U.T.-II/III Data list

45 ISC servo position (Refer to P.13D-66.)

Check the ignition timing. (Refer to GROUP 11E ï On-vehicle Service.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check the purge control system. D Check the EGR control system. D Check the compression pressure. D Check if foreign materials (water, alcohol, etc.) got into fuel.

Check the A/C switch and A/C relay system. (Refer to P.13D-63, INSPECTION PROCEDURE 31.)

Adjust the basic idle speed. (Refer to P.13D-91.)

Check that the crank angle sensor is installed properly.

13D-46

INSPECTION PROCEDURE 9

MPI <4G63> ï TroubleshootingMPI <4G63> ï Troubleshooting

Idling speed is high. (Improper idling speed)

In such cases as the above, the cause is probably that the intake air volume during idling is too great.

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the ISC servo for operation sound. (Refer to P.13D-102.)

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

28 A/C switch (Refer to P.13D-66.)

Basic idle speed adjustment (Refer to P.13D-91.)

Check the trouble symptom.

YES

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the ISC servo system. (Refer to P.13D-64, INSPECTION PROCEDURE 32.)

Check the throttle position sensor system. (Referto P.13D-18,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 14.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the A/C switch and A/C relay system. (Refer to P.13D-63, INSPECTION PROCEDURE 31.)

Clean the throttle valve area. (Refer to P.13D-90.)

Probable cause

D Malfunction of the ISC servo system D Malfunction of the throttle body

INSPECTION PROCEDURE 10

Idling speed is low. (Improper idling speed)

In cases such as the above, the cause is probably that the intake air volume during idling is too small.

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the ISC servo for operation sound. (Refer to P.13D-102.)

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

Basic idle speed adjustment (Refer to P.13D-91.)

Check the trouble symptom.

YES

Probable cause

D Malfunction of the ISC servo system D Malfunction of the throttle body

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the ISC servo system. (Refer to P.13D-64, INSPECTION PROCEDURE 32.)

Check the throttle position sensor system. (Referto P.13D-18,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 14.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Clean the throttle valve area. (Refer to P.13D-90.)

INSPECTION PROCEDURE 11

MPI <4G63> ï Troubleshooting

13D-47

When the engine is cold, it stalls at idling. (Die out)

Insuchcases as theabove,thecauseisprobablythatthe air/fuel mixture is inappropriate when the engine is cold, or that the intake air volume is insufficient.

Were the battery terminals disconnected?

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Does the engine stall right after the accelerator pedal is released?

Is engine-idling stable after the warming-up?

YES

Check the ISC servo for operation sound. (Refer to P.13D-102.)

Check the injector for operation sound.

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

YES

After warming-up, let the engine run at idling for 10 minutes.

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Clean the throttle valve area. (Refer to P.13D-90.)

Check if the unstable idling (Rough idling, hunting). (Refer to P.13D-44, INSPECTION PROCEDURE 8.)

Check the ISC servo system. (Refer to P.13D-64, INSPECTION PROCEDURE 32.)

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check the throttle position sensor system. (Refer to P.13D-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

Probable cause

D Malfunction of the ISC servo system D Malfunction of the throttle body D Malfunction of the injector system D Malfunction of the ignition system

Check the fuel pressure. (Refer to P.13D-92.)

Check the ignition timing. (Refer to GROUP 11C ï On-vehicle Service.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check the compression pressure. D Check the engine oil viscosity.

Check that the crank angle sensor is installed properly.

13D-48

INSPECTION PROCEDURE 12

MPI <4G63> ï Troubleshooting

When the engine is hot, it stalls at idling. (Die out)

In such cases as the above, the cause is probably that ignition system, air/fuel mixture, idle speed control (ISC) or compression pressure is defective. In addition, if the engine suddenly stalls, the cause may also be a defective connector contact.

Were the battery terminals disconnected?

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the ISC servo for operation sound. (Refer to P.13D-102.)

Check the injector for operation sound.

Does the engine stall right after the accelerator pedal is released?

Does the engine stall easily again?

YES

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

13 Intake air temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

25 Barometric pressure sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

M.U.T.-II/III Data list

59 Oxygen sensor (rear)

D Transmission: D range D Driving with throttle widely open

OK: 600 ï 1,000 mV

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: 600 ï 1,000 mV during sudden racing

YES

After warming-up, let the engine run at idling for 10 minutes.

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the ISC servo system. (Refer to P.13D-64, INSPECTION PROCEDURE 32.)

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

D Clean the throttle valve area. (Refer to P.13D-90.)

While carrying out an intermittent malfunction simulation test (Refer to GROUP 00 ï Points to Note for Intermittent Malfunctions.), check for sudden changes in the signals shown below.

D Crank angle sensor signal D Injector drive signal

Check the throttle position sensor system. (Refer to P.13D-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

Check the intake air temperature sensor system. (Referto P.13D-16,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 13.)

Check the barometric pressure sensor system. (Referto P.13D-26,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 25.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

Check the oxygen sensor (rear) system. (Referto P.13D-32,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 59.)

Check the oxygen sensor (front) system. (Referto P.13D-13,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 11.)

Probable cause

D Malfunction of the ignition system D Malfunction of the air-fuel ratio control system D Malfunction of the ISC system D Drawing air into intake system D Improper connector contact

D Primary and secondary

ignition signal

D Fuel pump drive signal D Engine-A/T-ECU power

supply voltage

To the next page

MPI <4G63> ï Troubleshooting

From the previous page

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: Changes between 0 ï 400 mV and 600 ï 1,000 mV during

idling

M.U.T.-II/III Data list

27 Power steering fluid pressure switch (Refer to P.13D-66.)

M.U.T.-II/III Data list

28 A/C switch (Refer to P.13D-66.)

M.U.T.-II/III Data list

45 ISC servo position (Refer to P.13D-66.)

Check the ignition timing. (Refer to GROUP 11C ï On-vehicle Service.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check if the injectors are clogged. D Check the compression pressure. D Check if foreign materials (water, alcohol, etc.) got into fuel.

13D-49

Check the fuel pressure. (Refer to P.13D-92.)

Check the power steering fluid pressure switch system. (Refer to P.13D-63, INSPECTION PROCEDURE 30.)

Check the A/C switch and A/C relay system. (Refer to P.13D-63, INSPECTION PROCEDURE 31.)

Adjust the basic idle speed. (Refer to P.13D-91.)

Check that the crank angle sensor is installed properly.

1. Inspect the intake of air into the air intake system.

D Broken intake man-

ifold gasket

D Broken vacuum hose D PCV valve does not

operate.

D Brokenairintakehose

2. Check the injector for clog.

13D-50

INSPECTION PROCEDURE 13

MPI <4G63> ï Troubleshooting

The engine stalls when starting the car. (Pass out)

In cases such as the above, the cause is probably misfiring due to a weak spark, or an inappropriate air/fuel mixture when the accelerator pedal is depressed.

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check if air was drawn into the intake system.

Broken intake manifold gasket Broken or disconnected vacuum hose Improper operation of the PCV valve Broken air intake hose

YES

INSPECTION PROCEDURE 14

The engine stalls when decelerating.

In cases such as the above, thecause is probably that the intake air volume is insufficient due to a defective idle speed control (ISC) servo system.

Were the battery terminals disconnected?

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

45 ISC servo position D Is the idle speed control (ISC) servo position drops to 0ï2

steps when decelerating (engine r/min less than 1,000)?

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

YES

Probable cause

D Drawing air into intake system D Malfunction of the ignition system

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

Probable cause

D Malfunction of the ISC system

After warming-up, let the engine run at idling for 10 minutes.

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the throttle position sensor system. (Refer to P.13D-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

Check the vehicle speed signal system. (Refer to P.13D-25, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 24.)

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Clean the throttle valve area.

INSPECTION PROCEDURE 15

MPI <4G63> ï Troubleshooting

13D-51

Hesitation, sag or stumble

In cases such as the above, the cause is probably that ignition system, air/fuel mixture or compression pressure is defective.

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the injectors for operation sound.

Check the ignition timing. (Refer to GROUP 11C ï On-vehicle Service.)

M.U.T.-II/III Data list

13 Intake air temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

25 barometric pressure sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

M.U.T.-II/III Data list

59 Oxygen sensor (rear)

D Transmission: D range D Driving with throttle widely open

OK: 600 ï 1,000 mV

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: 600 ï 1,000 mV during sudden racing

YES

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check that the crank angle sensor is installed properly.

Check the intake air temperature sensor system. (Referto P.13D-16,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 13.)

Check the barometric pressure sensor system. (Referto P.13D-26,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 25.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the throttle position sensor system. (Refer to P.13D-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

Check the oxygen sensor (rear) system. (Referto P.13D-32,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 59.)

Check the oxygen sensor (front) system. (Referto P.13D-13,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 11.)

Probable cause

D Malfunction of the ignition system D Malfunction of the air-fuel ratio control system D Malfunction of the fuel supply system D Malfunction of the EGR control solenoid valve system D Poor compression

To the next page

13D-52

From the previous page

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: Changes between 0 ï 400 mV and 600 ï 1,000 mV during

idling

Check the fuel pressure. (Refer to P.13D-92.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check the EGR control system. D Check the compression pressure. D Check the fuel filter or fuel line for clogging.

MPI <4G63> ï TroubleshootingMPI <4G63> ï Troubleshooting

INSPECTION PROCEDURE 16

Check the fuel pressure. (Refer to P.13D-92.)

1. Inspect the intake of air into the air intake system.

D Broken intake man-

ifold gasket

D Broken vacuum hose D PCV valve does not

operate.

D Brokenairintakehose

2. Check the injector for clog.

The feeling of impact or vibration when accelerating

In cases such as the above, the cause is probably that there is an ignition leak accompanying the increase in the spark plug demand voltage during acceleration.

YES

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check for occurrence of ignition leak.

Probable cause

D Malfunction of the ignition system

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

INSPECTION PROCEDURE 17

The feeling of impact or vibration when decelerating.

Malfunction of the ISC system is suspected. D Malfunction of the ISC system

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the ISC servo for operation sound. (Refer to P.13D-102.)

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

YES

Probable cause

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the ISC servo system. (Refer to P.13D-64, INSPECTION PROCEDURE 32.)

Check the throttle position sensor system. (Refer to P.13D-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

Clean the throttle valve area. (Refer to P.13D-90.)

INSPECTION PROCEDURE 18

MPI <4G63> ï Troubleshooting

13D-53

Poor acceleration

Defective ignition system, abnormal air-fuel ratio, poor compression pressure, etc. are suspected.

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the injectors for operation sound.

Check the ignition timing. (Refer to GROUP 11C ï On-vehicle Service.)

M.U.T.-II/III Data list

13 Intake air temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

25 Barometric pressure sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

M.U.T.-II/III Data list

59 Oxygen sensor (rear)

D Transmission: D range D Driving with throttle widely open

OK: 600 ï 1,000 mV

YES

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check that the crank angle sensor is installed properly.

Check the intake air temperature sensor system. (Referto P.13D-16,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 13.)

Check the barometric pressure sensor system. (Referto P.13D-26,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 25.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the throttle position sensor system. (Refer to P.13D-18, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

Check the oxygen sensor (rear) system. (Referto P.13D-32,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 59.)

Probable cause

D Malfunction of the ignition system D Malfunction of the air-fuel ratio control system D Malfunction of the fuel supply system D Poor compression pressure D Clogged exhaust system

To the next page

13D-54

From the previous page

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: 600 ï 1,000 mV during sudden racing

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: Changes between 0 ï 400 mV and 600 ï 1,000 mV during

idling

Check the fuel pressure. (Refer to P.13D-92.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check the compression pressure. D Check the fuel filter or fuel line for clogging. D Broken air intake hose D Clogged air cleaner

MPI <4G63> ï Troubleshooting

Check the oxygen sensor (front) system. (Referto P.13D-13,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 11.)

Check the fuel pressure. (Refer to P.13D-92.)

1. Inspect the intake of air into the air intake system.

D Broken intake man-

ifold gasket

D Broken vacuum hose D PCV valve does not

operate.

D Brokenairintakehose

2. Check the injector for clog.

INSPECTION PROCEDURE 19

Surge

Defective ignition system, abnormal air-fuel ratio, etc. are suspected. D Malfunction of the ignition system

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the injectors for operation sound.

Check the ignition timing. (Refer to GROUP 11E ï On-vehicle Service.)

M.U.T.-II/III Data list

13 Intake air temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

25 Barometric pressure sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

14 Throttle position sensor (Refer to P.13D-66.)

M.U.T.-II/III Actuator test

10 EGR control solenoid valve (Refer to P.13D-70.)

YES

Probable cause

D Malfunction of the air-fuel ratio control system D Malfunction of the EGR control solenoid valve system

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the injector system. (Refer to P.13D-29,INSPECTION PROCEDURE FOR DIAGNOSIS CODE 41.)

Check that the crank angle sensor is installed properly.

Checktheintake air temperaturesensorsystem. (RefertoP.13D-16, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 13.)

Check the barometric pressure sensor system. (Refer to P.13D-26, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 25.)

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the throttle position sensor system. (Referto P.13D-18,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 14.)

Check the EGR control solenoid valve system. (Refer to P.13D-65, INSPECTION PROCEDURE 34.)

To the next page

MPI <4G63> ï TroubleshootingMPI <4G63> ï Troubleshooting

From the previous page

M.U.T.-II/III Data list

59 Oxygen sensor (rear)

D Transmission: D range D Driving with throttle widely open

OK: 600 ï 1,000 mV

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: 600 ï 1,000 mV during sudden racing

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: Changes between 0 ï 400 mV and 600 ï 1,000 mV during

idling

Check the fuel pressure. (Refer to P.13D-92.)

Check the following items.

D Check the ignition coil, spark plugs, spark plug cables. D Check the EGR control system.

13D-55

Check the oxygen sensor (rear) system. (Referto P.13D-32,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 59.)

Check the oxygen sensor (front) system. (Referto P.13D-13,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 11.)

Check the fuel pressure. (Refer to P.13D-92.)

1. Inspect the intake of air into the air intake system.

D Broken intake man-

ifold gasket

D Broken vacuum hose D PCV valve does not

operate.

D Brokenairintakehose

2. Check the injector for clog.

INSPECTION PROCEDURE 20

Knocking

In cases as the above, the cause is probably that the detonation control is defective or the heat value of the spark plug is inappropriate.

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Does knocking occur when driving with the detonation sensor connector disconnected? At this time, use the M.U.T.-II/III to check if the timing is retarded compared to when the detonation sensor connector is disconnected.

YES

Check the following items.

D Spark plugs D Check if foreign materials (water, alcohol, etc.) got into fuel.

YES

Probable cause

D Inappropriate heat value of the spark plug D Defective detonation sensor

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check the detonation sensor system. (Refer to P.13D-28, INSPECTION PROCEDURE FOR DIAGNOSIS CODE 31.)

INSPECTION PROCEDURE 21

Dieseling

Fuel leakage from injectors is suspected. D Fuel leakage from injectors

Check the injectors for fuel leakage.

Probable cause

13D-56

INSPECTION PROCEDURE 22

MPI <4G63> ï Troubleshooting

Too high CO and HC concentration when idling

Abnormal air-fuel ratio is suspected. D Malfunction of the air-fuel ratio control system

YES

M.U.T.-II/III Self-Diag code

Are diagnosis codes displayed?

Check the ignition timing. (Refer to GROUP 11C ï On-vehicle Service.)

M.U.T.-II/III Data list

21 Engine coolant temperature sensor. (Refer to P.13D-66.)

M.U.T.-II/III Data list

13 Intake air temperature sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

25 Barometric pressure sensor (Refer to P.13D-66.)

M.U.T.-II/III Data list

59 Oxygen sensor (rear)

D Transmission: D range D Driving with throttle widely open

OK: 600 ï 1,000 mV

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: 600 ï 1,000 mV when racing suddenly.

M.U.T.-II/III Data list

11 Oxygen sensor (front)

OK: Repeat 0 ï 400 mV and 600 ï 1,000 mV alternately when

idling.

Check the fuel pressure. (Refer to P.13D-92.)

Probable cause

D Deteriorated catalyst

Refer to P.13D-12, INSPECTION CHART FOR DIAGNOSIS CODES.

Check that the crank angle sensor is installed properly.

Check the engine coolant temperature sensor system. (Referto P.13D-20,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 21.)

Check the intake air temperature sensor system. (Referto P.13D-16,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 13.)

Check the barometric pressure sensor system. (Referto P.13D-26,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 25.)

Check the oxygen sensor (rear) system. (Referto P.13D-32,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 59.)

Check the oxygen sensor (front) system. (Referto P.13D-13,INSPECTIONPROCEDUREFOR DIAGNOSIS CODE 11.)

Replace the oxygen sensor.

Check the trouble symptom.

Check the following items.

D Check the injectors for operation sound. D Check the injectors for fuel leakage. D Check the ignition coil, spark plugs, spark plug cables. D Check the compression pressure. D Check the positive crankcase ventilation system. D Check the purge control system. D Check the EGR control system.

Check the trouble symptom.

Replace the catalytic converter.

INSPECTION PROCEDURE 23

MPI <4G63> ï Troubleshooting

13D-57

Low alternator output voltage (approx. 12.3 V)

The alternator may be defective, or malfunctions, which are listed in the right column, may be suspected.

Measureat the alternatorconnectorside B-26. D Connect the connector.

(Test harness: MB991519)

D Voltage between 1 (black clip) and

earth (Engine: Idling) (Radiator fan: Not operating) (Head lamp: OFF o ON) (Stop lamp: OFF o ON) (Rear defogger switch: OFF o ON)

OK: Voltage rises by 0.2 ï 3.5 V.

Check the alternator. (Refer to GROUP 16 ï Charging System.)

Measure at the alternator connector. B-26 D Disconnect the connector, and

measure at the harness side.

D Disconnect the engine-A/T-ECU

connector.

D Continuity between 1 and earth

OK: No continuity

Check the following connectors:

B-18, C-122

Check the trouble symptom.

INSPECTION PROCEDURE 24

Idling speed is improper when A/C is operating

If the engine-A/T-ECU detects that the air conditioner is on, it activates the idle speed control (ISC) servo to control idle-up operation. The automatic compressor-ECU judges if the load caused by air conditioner operation is high or low, and converts it to voltage signal (high or low voltage) and inputs the signal to the engine-A/T-ECU. Based on this voltage signal, the engine-A/T-ECU controls the idle-up speed (for high or low load).

Probable cause

D Malfunction of the charging system

(Refer to GROUP 16 ï Charging System.)

D Short circuit in harness between alternator G terminal

and engine-A/T-ECU

D Malfunction of the engine-A/T-ECU

Check the harness wire between the alternatorandthe engine-A/T-ECUconnector, and repair if necessary.

Repair

Replace the engine-A/T-ECU.

Probable cause

D Malfunction of the A/C control system D Improper connector contact, open circuit or

short-circuited harness wire

D Malfunction of the engine-A/T-ECU

Measure at the engine-A/T-ECU connector C-124.

D Connect the connector. D Voltage between 61 and earth (Engine: at idle, outside air

temperature: 25_C or more)

OK: 0 ï 3 V [When A/C is MAX. COOL condition (when

the load by A/C is high)] System voltage [When A/C is MAX. HOT condition (when the load by A/C is low)]

Check the A/C system. (Refer to GROUP 55 ï On-vehicle Service.)

Check the following connector:

C-124

Check the trouble symptom.

Replace the engine-A/T-ECU.

Repair

13D-58

INSPECTION PROCEDURE 25

MPI <4G63> ï Troubleshooting

Fans (radiator fan, A/C condenser fan) are inoperative.

The engine-A/T-ECU sends a duty signal to the fan controller according to engine coolant temperature, vehicle speed, or A/C switch. The fan controller controls radiator fan and condenser fan speeds, based on this signal. (The closer the terminal voltage comes to 5V,the higher the fan speed becomes.)

Measure at the engine-A/T-ECU connector C-122.

D Disconnect the connector, measure at the harness side. D Voltage between terminal 18 and earth

(Ignition switch: ON)

OK: 4.8 ï 5.2 V (The fan runs at high speed.)

D Earth terminal 18.

(Ignition switch: ON)

OK: The fan stops.

Check the following connector: C-122

Check the trouble symptom.

M.U.T.-II/III Data list

21 Engine coolant temperature sensor OK: After the engine has been warmed up, the engine coolant

temperature during idling is identical to the M.U.T.-II/IIIreading.

Check the thermostat.

Check the harness wire between the engine-A/T-ECU and fan controller.

Check the radiator fan and condenser fan circuit. (Refer to GROUP 14 ï Troubleshooting.)

Repair

Check the engine coolant temperature sensor system. (Refer to P.13D-20, INSPECTION PROCEDURE FOR DIAGNOSIS DODE

21.)

Replace

Probable cause

D Malfunction of the fan motor relay D Malfunction of the fan motor D Malfunction of the fan controller D Open or short circuit, or poor connector contact D Malfunction of the engine-A/T-ECU

Repair

Replace the engine-A/T-ECU.

MPI <4G63> ï Troubleshooting

INSPECTION PROCEDURE 26

Check the engine-A/T-ECU power supply and earth circuit.

13D-59

Measure the engine-A/T-ECU connectors, C-124, C-126. D Disconnect the connector and measure at the harness side (1) Voltage between 98 and earth (Ignition switch: ON)

OK: System voltage

(2) Voltage between 49 and earth

OK: System voltage

(3) Voltage between 41, 47 and earth

OK: System voltage (when the terminal 49 is earthed)

(4) Continuity between 42, 48 and earth

OK: Continuity

(5) Voltage between 66 and earth

OK: System voltage

Check the following connectors:

C-124, C-126

Check the trouble symptom.

Replace the engine-A/T-ECU.

Check the harness wire between engine-A/T-ECU and battery, and repair if necessary.

Repair

(1) NG

(2), (3) NG

(4) NG

(5) NG

Check the following connectors: C-14,

C-209, Cï210

Check the trouble symptom.

Check the harness wire betweenengine-A/T-ECU and ignition switch connector.

Check the ignition switch. (Refer to GROUP 54 ï Ignition Switch and Immobilizer System.)

Check the following connectors: A-13,

B-16X, C-12

Check the trouble symptoms.

Check the harness wire between engine-A/T-ECUand control relay connector, and repair if necessary.

Check the harness wire between engine-A/T-ECU and earth, and repair if necessary.

Repair

INSPECTION PROCEDURE 27

Power supply system and ignition switch-IG system

When an ignition switch ON signal is input to the engine-A/T-ECU,the engine-A/T-ECU turns the engine control relay ON. This causes battery voltage to be supplied to the engine-A/T-ECU, injectors and air flow sensor.

Check the engine control relay. (Refer to P.13D-96.)

Measure at the engine control relay connector B-16X.

D Disconnect the connector, and measure at the harness side. D Voltage between 3, 4 and earth

OK: System voltage

Check the engine-A/T-ECU power supply and earth circuit. (Refer to P.13D-59, INSPECTION PROCEDURE 26.)

Probable cause

D Malfunction of the ignition switch D Malfunction of the engine control relay D Improper connector contact, open circuit or

short-circuited harness wire

D Disconnected engine-A/T-ECU earth wire D Malfunction of the engine-A/T-ECU

Replace

Check the following connector: A-13

Check the trouble symptom.

Checktheharness wire betweenbatteryand control relayconnector, and repair if necessary.

Repair

13D-60

INSPECTION PROCEDURE 28

MPI <4G63> ï Troubleshooting

Fuel pump system

Engine-A/T-ECU turns fuel pump relay ON to supply drive voltage to fuel pump while engine is cranked and rotated.

M.U.T.-II/III Actuator test

07 Fuel pump (Refer to P.13D-70.)

Check fuel pump relay (1). (Refer to P.13D-96.)

Check fuel pump relay (2). (Refer to P.13D-96.)

Measure at connector C-222 of fuel pump relay (1) D Disconnect the connector to

measure at the harness side

(1) Voltage of terminal No. 1 ï earth

(Ignition switch: ON)

OK: System voltage

(2) Voltage of terminal No. 2 ï earth

OK: System voltage

(3) Continuity of terminal No. 4 ï earth

OK: Continuity

(1) NG

(2) NG

Normal

Replace

Check the following connector:

C-210

Check the trouble symptom.

Check the following connectors:

C-209, C-27

Check and repair harness from fuel pump relay (1) to battery.

Probable cause

D Malfunction of the fuel pump relay (1) D Malfunction of the fuel pump relay (2) D Malfunction of the fuel pump D Improper connector contact, open circuit or

short-circuited harness wire

D Malfunction of the engine-A/T-ECU

Repair

Check harness from fuel pump relay (1) to ignition switch.

Repair

Check ignitionswitch. (RefertoGROUP 54A ï Ignition Switch.)

Repair

Measure at connector C-220 of fuel pump relay (2) D Disconnect the connector to

measure at the harness side.

D Ignition switch: ON (1) Voltage of terminal No.1 ï earth

OK: System voltage

(2) Voltage of terminal No.3 ï earth

OK: System voltage

To the next page.

(3) NG

(1) NG

(2) NG

Check the following connector:

C-212

Check and repair harness from fuel pump relay (1) to earth.

Check the following connector:

C-210

Check the trouble symptom.

Check the following connector:

C-222

Check and repair harness from fuel pump relay (1) to fuel pump relay (2).

Repair

Check harness from fuel pump relay (2) to ignition switch.

Check ignition switch. (Refer to GROUP 54A ï Ignition Switch.)

Repair

From the previous page.

Measure at the C-122 engine-A/T-ECU connector. D Disconnect the connector to

measure at the harness side

D Voltage of terminal No. 21 ï earth D Ignition switch: ON

OK: System voltage

Measure at connector C-122 of engineA/T-ECU D Disconnect the connector to

measure at the harness side

D Terminal No. 21 ï earth short circuit D Ignition switch: ON

OK: Fuel pump is operated

(operating noise audible)

Measure at connector D-16 of fuel pump D Disconnect the connector to

measure at the harness side

(1) Voltage of terminal No. 5 ï earth

(Ignition switch: ON) OK: System voltage

(2) Continuity of terminal No. 4 ï earth

OK: Continuity

MPI <4G63> ï Troubleshooting

(1) NG

(2) NG

Check the following connectors:

C-14, C-212, Cï220

Check the trouble symptom.

Check the following connector:

C-122

Check the trouble symptom.

Check the following connectors:

D-18, C-215, C-220

Check the trouble symptom.

Check the following connector:

D-16

Check the trouble symptom.

13D-61

Repair

Check and repair harness from fuel pump relay (2) to engine-A/T-ECU

Repair

Replace the engine-A/T-ECU.

Repair

Check and repair harness from fuel pump relay (2) to fuel pump.

Repair

Check and repair harness from fuel pump to earth.

Check the following connectors:

D-16, D-18, C-215, C-220

Check the trouble symptom.

Replace the fuel pump.

Replace

13D-62

INSPECTION PROCEDURE 29

MPI <4G63> ï Troubleshooting

Ignition switch-ST and inhibitor switch system

D The ignition switch-ST inputs a HIGH signal to the engine-A/T-ECU while the

engine is cranking. The engine-A/T-ECU controls fuel injection, etc. during starting based on this input.

D The inhibitor switch inputs the condition of the select lever, i.e. whether it is in

P or N range or in some other range, to the engine-A/T-ECU. The engine-A/T-ECU controls the idle speed control (ISC) servo based on this input.

M.U.T.-II/III Data list

Check the 61 Inhibitor switch data list of automatic transmission system. (Refer to GROUP 23A ï Troubleshooting.)

Check the inhibitor switch D Continuity between the terminal 9

and terminal 10

(Refer to GROUP 23A ï

Troubleshooting.)

Measure at the inhibitor switch connector B-20. D Disconnect the connector, and

measure at the harness side.

D Voltage between 10 and earth

(Ignition switch: START)

OK: System voltage

Measure at the engine-A/T-ECU connector C-124. D Disconnect the connector, and

measure at the harness side.

D Voltage between 58 and earth

(Selector lever: P or N range)

(Ignition switch: START)

OK: System voltage

Check the inhibitor switch system (RefertoGROUP23A ï On-vehicle Service.)

Replace

Check the following connector:

C-14

Check the trouble symptom.

Check the harness wire between the inhibitor switch and ignition switch.

Repair

Check the following connector:

B-20

Check the trouble symptom.

Probable cause

D Malfunction of the ignition switch D Malfunction of the inhibitor switch D Improper connector contact, open circuit or

short-circuited harness wire

D Malfunction of the engine-A/T-ECU.

Repair

Check the ignition switch (Refer to GROUP 54 ï Ignition Switch and Immobilizer system.)

Repair

Check the harness wire between the inhibitor switch and engine-A/T-ECU, and repair if necessary.

Check the following connector:

C-124

Check the trouble symptom.

Replace the engine-A/T-ECU.

Replace

INSPECTION PROCEDURE 30

MPI <4G63> ï Troubleshooting

13D-63

Power steering fluid pressure switch system

The presence or absence of power steering load is input to the engine-A/T-ECU. The engine-A/T-ECU controls the idle speed control (ISC) servo based on this input.

Check the power steering fluid pressure switch. (Refer to GROUP 37A ï On-vehicle Service.)

Measure at the power steering fluid pressure switch connector B-115.

D Disconnect the connector, and measure at the harness side. D Voltage between 1 and earth (Ignition switch: ON)

OK: System voltage

Check the following connector: B-115

Check the trouble symptom.

Replace the engine-A/T-ECU.

Repair

INSPECTION PROCEDURE 31

Probable cause

D Malfunction of the power steering fluid pressure switch D Improper connector contact, open circuit or

short-circuited harness wire

D Malfunction of the engine-A/T-ECU

Replace

Check the following connector: C-124

Check the trouble symptom.

Check harness wire between engine-A/T-ECU and power steering fluid pressure switch connector.

Replace the engine-A/T-ECU.

Repair

A/C switch and A/C relay system

When an A/C ON signal is input to the engine-A/T-ECU, the engine-A/T-ECU carries out control of the idle speed control (ISC) servo, and also operates the A/C compressor magnetic clutch.

Check the A/C compressor relay. (Refer to GROUP 55 ï On-vehicle Service.)

Measure at the engine-A/T-ECU connectors C-122, C-126.

D Disconnect the connectors, and measure at the harness side. D Voltage between 20 and earth, and 83 and earth

(Ignition switch: ON, A/C switch: ON)

OK: System voltage

D Short circuit between 20 and earth

OK: A/C compressor clutch turns on.

Replace

Check the A/C system. (Refer to GROUP 55 ï On-vehicle Service.)

Check the following connectors: C-122,

C-126

Check the trouble symptom.

Replace the engine-A/T-ECU.

Probable cause

D Malfunction of the A/C control system D Malfunction of the A/C switch D Improper connector contact, open circuit or

short-circuited harness wire

D Malfunction of the engine-A/T-ECU

Replace

13D-64

INSPECTION PROCEDURE 32

MPI <4G63> ï Troubleshooting

Idle speed control (ISC) servo (Stepper motor) system

The engine-A/T-ECUcontrols the intake air volume during idling by opening andclosing the servo valve located in the bypass air passage.

Check the ISC servo (Refer to P.13D-102.)

Measure at the ISC servo connector B-103.

D Disconnect the connector and measure at the harness side. D Voltage between 2 and earth, and 5 and earth

(Ignition switch: ON)

OK: System voltage

Measure at the engine-A/T-ECU connector C-122.

D Disconnect the connector, measure at the harness side. D Voltage between each of 14, 15, 28, 29 and earth (Ignition

switch: ON)

OK: System voltage

Check the following connector: C-122

Check the trouble symptom.

Replace

Repair

Check the harness wire between control relay and ISC servo connector, and repair if necessary.

Check the following connector: B-103

Check the trouble symptom.

Check harness wire between engine-A/T-ECU and ISC servo connector, and repair if necessary.

Replace the engine-A/T-ECU.

Probable cause

D Malfunction of the ISC servo D Improper connector contact, open circuit or

short-circuited harness wire

D Malfunction of the engine-A/T-ECU

Repair

INSPECTION PROCEDURE 33

MPI <4G63> ï TroubleshootingMPI <4G63> ï Troubleshooting

13D-65

Purge control solenoid valve system

The purge control solenoid valve controls the purging of air from the canister located inside the intake manifold.

Check the purge control solenoid valve. (Refer to GROUP 17 ï Emission Control System.)

Measure at the purge control solenoid valve connector B-105.

D Disconnect the connector and measure at the harness side. D Voltage between 2 and earth (Ignition switch: ON)

OK: System voltage

Measure at the engine-A/T-ECU connector C-122.

D Disconnect the connector and measure at the harness side. D Voltage between 34 and earth (Ignition switch: ON)

OK: System voltage

Check the following connector: C-122

Check the trouble symptom.

Repair

Replace

Check the harness wire between engine control relay and solenoid valve connector, and repair if necessary.

Checkthefollowing connector:B-105

Check the trouble symptom.

Check the harness wire between engine-A/T-ECU and solenoid valve connector, and repair if necessary.

Replace the engine-A/T-ECU.

Probable cause

D Malfunction of the solenoid valve D Improper connector contact, open circuit or

short-circuited harness wire.

D Malfunction of the engine-A/T-ECU

Repair

INSPECTION PROCEDURE 34

EGR control solenoid valve system

The EGR control solenoid valve is controlled by the negative pressure resulting from EGR operation leaking to port “A” of the throttle body.

Check the EGR control solenoid valve. (Refer to GROUP 17 ï Emission Control System.)

Measure at the EGR control solenoid valve connector B-101.

D Disconnect the connector and measure at the harness side. D Voltage between 1 and earth (Ignition switch: ON)

OK: System voltage

Measure at the engine-A/T-ECU connector C-122.

D Disconnect the connector and measure at the harness side. D Voltage between 6 and earth (Ignition switch: ON)

OK: System voltage

Check the following connector: C-122

Check the trouble symptom.

Replace the engine-A/T-ECU.

Repair

Probable cause

D Malfunction of the solenoid valve D Improper connector contact, open circuit or

short-circuited harness wire.

D Malfunction of the engine-A/T-ECU

Replace

Check the harness wire between engine control relay and solenoid valve connector, and repair if necessary.

Check the following connector: B-101

Check the trouble symptom.

Check the harness wire between engine-A/T-ECU and solenoid valve connector, and repair if necessary.

Repair

13D-66

theair/fuel

*1t

2,500

83–123

MPI <4G63> ï Troubleshooting

DATA LIST REFERENCE TABLE

Caution When shifting the select lever to D range, the brakes should be applied so that the vehicle does not move forward.

NOTE

: In a new vehicle [driven approximately 500 km or less], the air intake plenum pressure is sometimes

10% higher than the standard pressure.

. The injector drive time represents the time when the cranking speed is at 250 r/min or below when

the power supply voltage is 11 V.

. In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10

longer than the standard time.

. In a new vehicle [driven approximately 500 km or less], the step of the stepper motor is sometimes

30 steps greater than the standard value.

Item No.

Inspection item

11 Oxygen

sensor (front)

12 Air flow

sensor

Inspection contents Normal condition Inspection

procedure No.

Engine:After having

warmed up

Air/fuel mixture is madeleaner whendecelerating, and is made richer when racing.

Engine:After having

warmed up

The oxygen sensor signal is used to check

mixture ratio, and control condition is also checked by the engine-A/T-ECU.

D Engine coolant

emperature:

80 ï 95 _C

D Lamps and all

accessories: OFF

D Transmission:

P range

When at 4,000 r/min, engine is suddenly decelerated

When engine is suddenly raced

Engine is idling 400 mV or less

2,500 r/min 400 mV or less

Engine is idling 18 – 44 Hz

r/min

Engine is raced Frequency

200 mV or less

600ï1,000 mV

(Changes)

600ï1,000 mV

(Changes)

600ï1,000 mV

increases in response to racing

Code No.1113D-13

ï ï

Reference page

13 Intake air

temperature sensor

Ignition switch: ON or with engine running

When intake air temperature is ï20_C

When intake air temperature is 0_C

When intake air temperature is 20_C

When intake air temperature is 40_C

When intake air temperature is 80_C

ï20_C

0_C

20_C

40_C

80_C

Code No.1313D-16

MPI <4G63> ï Troubleshooting

iti

signal

No.

13D-67

Item No.

item

14 Throttle

pos sensor

16 Power

supply voltage

18 Cranking

signal (ignition switch-ST)

21 Engine

coolant temperature sensor

Normal conditionInspection contentsInspection

Ignition switch: ON

Ignition switch: ON System voltage Procedure

Ignition switch: ON

Ignition switch: ON or with engine running

Set to idle position 535ï735 mV

Gradually open Increases in

proportion to throttle opening angle

Open fully 4,500ï5,000 mV

Engine: Stopped OFF

Engine: Cranking ON

When engine coolant temperature is ï20_C

When engine coolant temperature is 0_C

ï20_C

0_C

Inspection procedure No.

Code No.

No. 27

Procedure No. 29

Code No.2113D-20

Reference page

13D-18

13D-59

13D-62

22 Crank angle

sensor

D Engine: Cranking D Tachometer:

Connected

D Engine: Idling D Idle position

switch: ON

When engine coolant temperature is 20_C

When engine coolant temperature is 40_C

When engine coolant temperature is 80_C

Compare the engine speed readings on the tachometer and the MUT-II/III.

When engine coolant temperature is ï20_C

When engine coolant temperature is 0_C

When engine coolant temperature is 20_C

20_C

40_C

80_C

Accord

1,103 – 1,303 r/min

Code No.2213D-22

When engine coolant temperature is 40_C

When engine coolant temperature is 80_C

924 – 1,124 r/min

650 – 850 r/min

13D-68

(when

A/C

switch

No.

No.29

ficiency

temperature:

cooling

fan

and

all

(Thetimingl

MPI <4G63> ï Troubleshooting

Item No.

item

25 Barometric

pressure sensor

27 Power

steering fluid pressure switch

28 A/C switch Engine: Idling

29 Inhibitor

switc

37 Volumetric

efficienc

Ignition switch: ON

Engine: Idling

(when A/C switch is ON, A/C compressor should be operating.)

Ignition switch: ON

D Engine coolant

temperature: 85ï95_C

D Lamps, and all

accessories: OFF

D Transmission:

P range

Normal conditionInspection contentsInspection

At altitude of 0 m 101 kPa

At altitude of 600 m 95 kPa

At altitude of 1,200 m 88 kPa

At altitude of 1,800 m 81 kPa

Steering wheel stationary

Steering wheel turning

A/C switch: OFF OFF

A/C switch: ON ON

P or N PorN

D, 3, 2, L or R D, 3, 2, L or R

Engine is idling 20 ï 30 %

2,500 r/min 20 ï 30 %

When engine is suddenly raced

OFF

Increases

Inspection procedure No.

Code No.

Procedure No. 30

Procedure No. 31

Procedure

ï ï

Reference page

13D-58

13D-63

13D-62

Injectors *

Injectors*

44 Ignition coils

and power transistors

Engine: Cranking

D Engine coolant

temperature: 85ï95_C

D Lamps, electric

coolin accessories: OFF

D Transmission:

P range

D Engine: After

having warmed up

D Timing lamp is set.

set in order to check actual ignition timing.)

fan and all

ampis

When engine coolant temperature is 0_C (injection is carried out for all cylinders simultaneously)

When engine coolant temperature is 20_C

When engine coolant temperature is 80_C

Engine is idling 2.2 – 3.4 ms

2,500 r/min 2.5 – 3.7 ms

When engine is suddenly raced

Engine is idling 2 – 18_BTDC

2,500 r/min 20 – 40_BTDC

14.7 – 22.1 ms

26.2 – 39.4 ms

6.6 – 9.8 ms

Increases

ï ï

MPI <4G63> ï Troubleshooting

motor

8595C

13D-69

Item No.

item

45 ISC

(stepper) motor position *4

49 A/C relay Engine: After having

59 Oxygen

sensor (rear)

D Engine coolant

temperature: 85ï95_C

D Lamps, electric

cooling fan and all accessories: OFF

D Transmission:

P range

D Engine: Idling D When A/C switch is

ON, A/C compressor should be operating

warmed up/Engine is idling

Engine: After having warmed up

Normal conditionInspection contentsInspection

A/C switch: OFF 2ï25 STEP

A/C switch: OFF o ON

D A/C switch: OFF D Select lever:

N range o D range

A/C switch: OFF OFF (Compressor

A/C switch: ON ON (Compressor

Engine is raced 600 ï 1000 mV Code No.5913D-32

Increases by 10ï70 steps

Increases by 5ï50 steps

clutch is not operating)

clutch is operating)

Inspection procedure No.

ï ï

Procedure No. 31

Reference page

13D-63

13D-70

idli

dif

MPI <4G63> ï Troubleshooting

ACTUATOR TEST REFERENCE TABLE

Item No.

Inspection item

01 Injectors Cut fuel to No. 1

02 Cut fuel to No. 2

03 Cut fuel to No. 3

04 Cut fuel to No. 4

07 Fuel pump Fuel pump

Drive contents Inspection contents Normal

injector

operates and fuel is recirculated.

Engine: After having warmed up/Engineis

(Cut the fuel supply to each injector in turn and check cylinders which don’t affect idling.)

D Engine:

D Fuel

Cranking

pump: Forced driving Inspect according to both the above conditions.

’

Pinch the return hose with fingers to feel the pulse of the fuel being recirculated.

Listen near the fuel tank for the sound of fuel pump operation.

Inspection

condition

Idling condition becomes

eren comes unstable).

Pulse is felt. Procedure

Sound of operation is heard.

procedure No.

Code No.4113D-29

No. 28

Reference page

13D-60

08 Purge

control solenoid valve

10 EGR

control solenoid valve

17 Basic ignition

timing

21 Fan controller Drive the fan

Solenoid valve turns from OFF to ON.

Set the engineA/T-ECU to ignition timing adjustment mode

motors

Ignition switch: ON Sound of op-

eration can be heard when solenoid valve is driven.

Ignition switch: ON Sound of op-

eration can be heard when solenoid valve is driven.

D Engine: Idling D Timing light is set

D Ignition switch: ON D A/C switch: ON

5 _BTDC ï ï

Fan motor runs

Procedure No. 33

Procedure No. 34

Procedure No. 25

13D-65

13D-58

MPI <4G63> ï Troubleshooting

13D-71

Needle-nosed wire probe

CHECK AT THE ENGINE-A/T-ECU TERMINALS

TERMINAL VOLTAGE CHECK CHART

1. Connect a needle-nosed wire probe (test harness: MB991223) to a voltmeter probe.

2. Insert the needle-nosed wire probe into each of the engine-A/T-ECU connector terminals from the wire side, and measure the voltage while referring to the check chart.

NOTE (1) Make the voltage measurement with the

engine-A/T-ECU connectors connected.

(2) You may find it convenient to pull out the

engine-A/T-ECU to make it easier to reach the connector terminals.

(3) The checks can be carried out off the order given

in the chart.

Caution Short-circuiting the positive (+) probe between a connector terminal and earth could damage the vehicle wiring, the sensor, engine-A/T-ECU or all of them. Be careful to prevent this!

3. If voltmeter shows any division from standard value, check the corresponding sensor, actuator and related electrical wiring, then repair or replace.

4. After repair or replacement, recheck with the voltmeter to confirm that the repair has corrected the problem.

13D-72

ily

heat

Ignition

coil

No.

A/Cswitch

OFFoON

(A/C

MPI <4G63> ï TroubleshootingMPI <4G63> ï Troubleshooting

Engine-A/T-ECU Connector Terminal Arrangement

Terminal No.

1 No. 1 injector While engine is idling after having warmed

9 No. 2 injector

24 No. 3 injector

2 No. 4 injector

3 Oxygen sensor

6 EGR control sole-

8 Alternator G termi-

11 Ignition coil ï No. 1,

Check item Check condition (Engine condition) Normal condition

up, suddenlydepressthe accelerator pedal. momentar

Engine: Idling after warming up 1 V or less

ron

noidvalve

nal

No. 4

Engine r/min: 5,000 r/min System voltage

Ignition switch: “ON” System voltage

While engine is idling, suddenly depress the accelerator pedal

D Engine: Warm, idle (radiator fan: OFF) D Headlamp: OFF o ON D Stop lamp: OFF o ON D Rear defogger switch: OFF o ON

Engine r/min: 3,000 r/min 0.3 ï 3.0 V

From 11 ï 14 V,

rops

slightly

From system voltage, momentaly drops

Voltage increases by 0.2 ï 3.5 V

12 Ignition coil ï No. 2,

No. 3

14 Stepper motor coil

<A>

28 Stepper motor coil

<B>

15 Stepper motor coil

<C>

29 Stepper motor coil

<D>

18 Fan controller Radiator and condenser fan is not operating 0 ï 0.3 V

19 Air flow sensor

resetsigna

D Engine: Soon after the warmed up

engine is started.

is operating)

Radiator and condenser fan is operating 0.7 V or more

Engine: Idle speed 0 ï 1V

Engine r/min: 3,000 r/min 6 ï 9V

compressor

System voltage l 1 V or less (Changes repeatedly)

MPI <4G63> ï Troubleshooting

(

)

heat

Igniti

“ON”

Syst

13D-73

Terminal No.

20 A/C relay D Engine: Idle speed

D A/C switch: OFF o ON (A/C compressor

is operating)

21 Fuel pump relay Ignition switch: “ON” System voltage

Engine: Idle speed 1 V or less

22 Engine warning

lamp

26 Oxygen sensor

rear

34 Purge control sole-

noidvalve

ower supply

43 Tachometer signal Engine r/min: 3,000 r/min 0.3 ï 3.0 V

Ignition switch: “LOCK” (OFF) o ”ON” 1 V or less o System voltage (After

Engine: Idling after warming up 1 V or less

Engine: Racing System voltage

Ignition switch: “ON” System voltage

Running at 3,500 r/min while engine is warming up after having been started

“

on switch:

”

Normal conditionCheck condition (Engine condition)Check item

System voltage or momentarily 6 V or more o 1 V or less

several seconds have elapsed)

1 V or less

em voltage

44 Engine coolant

temperature sensor

45 Crank angle sen-

sor

46 Sensor impressed

voltage

49 Engine control

relay (power supply)

Ignition switch: “ON” When engine coolant

temperature is ï20_C

When engine coolant temperature is 0_C

When engine coolant temperature is 20_C

When engine coolant temperature is 40_C

When engine coolant temperature is 60_C

When engine coolant temperature is 80_C

Engine: Cranking 0.4 ï 4.0 V

Engine: Idle speed 1.5 ï 2.5 V

Ignition switch: “ON” 4.9 ï 5.1 V

Ignition switch: “LOCK” (OFF) System voltage

Ignition switch: “ON” 1 V or less

3.9 ï 4.5 V

3.2 ï 3.8 V

2.3 ï 2.9 V

1.3 ï 1.9 V

0.7 ï 1.3 V

0.3 ï 0.9 V

52 Power steering

fluid pressure switc

Engine: Idling after warmed up

When steering wheel is stationary

When steering wheel is turned

System voltage

1 V or less

13D-74

terminal

Headlamp:

OFF

“ON”

MPI <4G63> ï Troubleshooting

Terminal No.

54 Alternator FR

terminal

55 Barometric pres-

sure sensor

56 Camshaft position

sensor

58 Ignition switch ï ST Engine: Cranking 8Vormore

61 A/C load signal Refer to GROUP 55 ï Troubleshooting

D Engine: Warm, idle (radiator fan: OFF) D Headlamp: OFF o ON D Stop lamp: OFF o ON D Rear defogger switch: OFF o ON

Ignition switch:

”

“

Engine: Cranking 0.4 ï 3.0 V

Engine: Idling 1.5 ï 3.0 V

(Inspection at Automatic compressor ï ECU terminal)

When altitude is 0 m 3.8 ï 4.2 V

When altitude is 600 m

When altitude is 1,200 m

When altitude is 1,800 m

Normal conditionCheck condition (Engine condition)Check item

Voltage decreases

3.5 ï 3.9 V

3.3 ï 3.7 V

3.0 ï 3.4 V

64 Intake air

temperature sensor

65 Air flow sensor Engine: Idle speed 2.2 ï 3.2 V

66 Backup power

supply

71 Oxygen sensor

(front)

Ignition switch: “ON”

Engine r/min: 2,500 r/min

Ignition switch: “LOCK” (OFF) System voltage

Engine: Running at 2,500 r/min after warmed up (Check using a digital type voltmeter)

When intake air temperature is ï20_C

When intake air temperature is 0_C

When intake air temperature is 20_C

When intake air temperature is 40_C

When intake air temperature is 60_C

When intake air temperature is 80_C

3.8 ï 4.4 V

3.2 ï 3.8 V

2.3 ï 2.9 V

1.5 ï 2.1 V

0.8 ï 1.4 V

0.4 ï 1.0 V

0 l 0.8 V (Changes repeatedly)

73 Oxygen sensor

(rear)

78 Throttle position

sensor

Engine: Idling after warmed up (Check using a digital type voltmeter)

Ignition switch: “ON”

Set throttle valve to idle position

Fully open throttle valve

0 l 0.6 V (Changes repeatedly)

0.535 ï 0.735 V

4.4 ï 5.3 V

MPI <4G63> ï Troubleshooting

13D-75

Terminal No.

83 A/C switch Engine: Idle speed Turn the A/C switch

OFF

Turn the A/C switch ON (A/C compressor is operating)

98 Ignition switch ï IG Ignition switch: “ON” System voltage

Normal conditionCheck condition (Engine condition)Check item

0.5 V or less

System voltage

13D-76

MPI <4G63> ï Troubleshooting

CHECK CHART FOR RESISTANCE AND CONTINUITY BETWEEN TERMINALS

1. Turn the ignition switch to “LOCK” (OFF) position.

2. Disconnect the engine-A/T-ECU connector.

3. Measure the resistance and check for continuity between the terminals of the engine-A/T-ECU harness-side connector while referring to the check chart.

NOTE (1) When measuring resistance and checking continuity,

a harness for checking contact pin pressure should be used instead of inserting a test probe.

(2) Checking need not be carried out in the order given

in the chart.

Caution If the terminals that should be checked are mistaken, or if connector terminals are not correctly shorted to earth, damage may be caused to the vehicle wiring, sensors, engine-A/T-ECU and/or ohmmeter. Be careful to prevent this!

4. If the ohmmeter shows any deviation from the standard value, check the corresponding sensor, actuator and related electrical wiring, and then repair or replace.

5. After repair or replacement, recheck with the ohmmeter to confirm that the repair or replacement has corrected the problem.

MPI <4G63> ï Troubleshooting

Engine-A/T-ECU Harness Side Connector Terminal Arrangement

13D-77

Terminal No.

1 ï 41 No. 1 injector 10.5 ï 13.5 : (At 20_C)

9 ï 41 No. 2 injector

24 ï 41 No. 3 injector

2 ï 41 No. 4 injector

3 ï 41 Oxygen sensor (front) heater 4.5 ï 8.0 : (At 20_C)

6 ï 41 EGR control solenoid valve 30 ï 34 : (At 20_C)

14 ï 41 Stepper motor coil (A) 28 ï 33 : (At 20_C)

28 ï 41 Stepper motor coil (B)

15 ï 41 Stepper motor coil (C)

29 ï 41 Stepper motor coil (D)

26 ï 41 Oxygen sensor (rear) heater 11 ï 18 : (At 20_C)

34 ï 41 Purge control solenoid valve 29 ï 35 : (At 20_C)

42 ï Body earth

Inspection item Normal condition (Check condition)

Engine-A/T-ECU earth Continuity (0 :)

48 ï Body earth

44 ï 57 Engine coolant temperature sensor 14 ï 17 k:

(When coolant temperature is ï20_C)

5.1 ï 6.5 k: (When coolant temperature is 0_C)

2.1 ï 2.7 k: (When coolant temperature is 20_C)

0.9 ï 1.3 k: (When coolant temperature is 40_C)

0.48 ï 0.68 k: (When coolant temperature is 60_C)

0.26 ï 0.36 k: (When coolant temperature is 80_C)

13D-78

MPI <4G63> ï Troubleshooting

Terminal No.

64 ï 16 Intake air temperature sensor 13 ï 17 k:

Normal condition (Check condition)Inspection item

(When intake air temperature is ï20_C)

5.3 ï 6.7 k: (When intake air temperature is 0_C)

2.3 ï 3.0 k: (When intake air temperature is 20_C)

1.0 ï 1.5 k: (When intake air temperature is 40_C)

0.56 ï 0.76 k: (When intake air temperature is 60_C)

0.30 ï 0.42 k: (When intake air temperature is 80_C)

MPI <4G63> ï Troubleshooting

13D-79

Oscilloscope

Special patterns pickup

Standard Wave Pattern Observation conditions

Function Special patterns

Pattern height Low

Pattern selector Display

Engine r/min Idle

OSCILLOSCOPE

The output signals of the sensors and the conditions of the actuation signals of the actuators can be inspected visually by observing the waveforms on the oscilloscope.

AIR FLOW SENSOR Measurement Method

1. Disconnect the air flow sensor connector, and connect the special tool test harness (MB991709) in between (All terminals should be connected).

2. Connect the oscilloscope special patterns pickup to air flow sensor connector terminal No. 3.

Alternate Method (Test harness not available)

1. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 65.

INSPECTION PROCEDURE USING AN

13D-80

Standard wave pattern

(V)

MPI <4G63> ï Troubleshooting

T1 T2

The time (cycle time) T is reduced when the amount of intake air increases.

Times T1 and T2 are equal.

Time

Observation conditions (from conditions above engine speed is increased by racing.)

(V)

Time

Wave Pattern Observation Points

Check that cycle time T becomes shorter and the frequency increases when the engine speed is increased.

MPI <4G63> ï Troubleshooting

Examples of Abnormal Wave Patterns

D Example 1

Cause of problem

Sensor interface malfunction

Wave pattern characteristics

Rectangular wave pattern is output even when the engine is not started.

D Example 2

Cause of problem

Damaged rectifier or vortex generation column

Wave pattern characteristics

Unstable wave pattern with nonïuniform frequency. However, when an ignition leak occurs during acceleration, the wave pattern will be distorted temporarily, even if the air flow sensor is normal.

13D-81

Camshaftposition sensor connector

Special patterns pick-up

Crank angle sensor connector

Oscilloscope

CAMSHAFT POSITION SENSOR AND CRANK ANGLE SENSOR

Measurement Method

1. Disconnect the camshaft position sensor connector and connect the special tool test harness (MB991709) in between (All terminals should be connected).

2. Connect the oscilloscope special pattern pickup to camshaft position sensor terminal No. 2.

3. Disconnect the crank angle sensor connector and connect the special tool test harness (MD998478) in between.

4. Connect the oscilloscope special patterns pickup to crank angle sensor terminal No. 2.

Alternate Method (Test harness not available)

1. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 56 (When checking the camshaft position sensor signal wave pattern).

2. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 45 (When checking the crank angle sensor signal wave pattern).

13D-82

MPI <4G63> ï Troubleshooting

Standard Wave Pattern Observation condition

Function Special patterns

Pattern height Low

Pattern selector Display

Engine r/min Idle

Standard wave pattern

Crank angle sensor output wave pattern

Camshaft position sensor output wave pattern

TDC: Top dead centre

(V)

2 engine revolutions (1 camshaft revolution)

75_BTDC

5_BTDC

No. 1 TDC No. 3 TDC No. 4 TDC No. 2 TDC

The time (cycle time) T is reduced when the engine speed increases

Time

Wave Pattern Observation Points

Check that cycle time T becomes shorter when the engine speed increases.

MPI <4G63> ï Troubleshooting

Examples of Abnormal Wave Patterns

D Example 1

Cause of problem

Sensor interface malfunction

Wave pattern characteristics

Rectangular wave pattern is output even when the engine is not started.

D Example 2

Cause of problem

Loose timing belt Abnormality in sensor disk

Wave pattern characteristics

Wave pattern is displaced to the left or right.

13D-83

Special patterns pickup

Oscilloscope

INJECTOR

Measurement Method

1. Disconnect the injector connector, and then connect the special tool test harness set (MB991348) in between (All terminals should be connected).

2. Connect the oscilloscope special patterns pickup to terminal No. 2 of the injector connector.

Alternate Method (Test harness not available)

1. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 1 (When checking the No. 1 cylinder).

2. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 9 (When checking the No. 2 cylinder).

3. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 24 (When checking the No. 3 cylinder).

4. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 2 (When checking the No. 4 cylinder).

13D-84

MPI <4G63> ï Troubleshooting

Standard Wave Pattern Observation conditions

Function Special patterns

Pattern height Variable

Variable knob Adjust while viewing the wave pattern

Pattern selector Display

Engine speed Idle

Standard wave pattern

(V)

Point B Injector drive time

Drive signal: ON Drive signal: OFF

Point A

Solenoid back electromotive force (Approx. 7u10 V)

Wave Pattern Observation Points

Point A: Height of solenoid back electromotive force

Contrast with standard wave pattern Probable cause

Time

Power voltage

Solenoid coil back electromotive force is low or doesn’t appear at all.

Point B: Injector drive time

D The injector drive time will be synchronized with the

D When the engine is suddenly raced, the drive time will

When idling When racing

Short in the injector solenoid

M.U.T.-II/III tester display.

be greatly extended at first, but the drive time will soon match the engine speed.

MPI <4G63> ï Troubleshooting

13D-85

Oscilloscope

Special patterns pickup

Standard wave pattern Observation conditions

Function Special patterns

Pattern height High

Pattern selector Display

IDLE SPEED CONTROL (ISC) SERVO (STEPPER MOTOR)

Measurement Method

1. Disconnect the ISC servo connector, and connect the special tool test harness (MB991709) in between.

2. Connect the oscilloscope special patterns pickup to the ISC servo side connector terminal No. 1, No. 3, No. 4 and No. 6 respectively.

Alternate Method (Test harness not available)

1. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 14, connection terminal No. 15, connection terminal No. 28, and connection terminal No. 29 respectively.

Engine condition When the engine coolant temperature is 20˚C or below, turn the ignition switch from ”LOCK”

(OFF) position to ”ON” (without starting the engine).

While the engine is idling, turn the A/C switch to ON.

Immediately after starting the warm engine.

13D-86

Standard wave pattern

MPI <4G63> ï Troubleshooting

Stepper motor control signal wave pattern

(V)

The wave pattern appears for an instant, but soon disappears.

Point B Coilreverse electromotive force (Approx. 3 u 10 V)

Point A Induced electromotive force from the motor turning

Time

Wave pattern Observation Points

Check that the standard wave pattern appears when the stepper motor is operating. Point A: Presence or absence of induced electromotive force from the motor turning (Refer to the abnormal wave pattern).

Contrast with standard wave pattern Probable cause

Induced electromotive force does not appear or is extremely small. Motor is malfunctioning

Point B: Height of coil reverse electromotive force

Contrast with standard wave pattern Probable cause

Coil reverse electromotive force does not appear or is extremely small. Short in the coil

Open circuit side

Normal side

MPI <4G63> ï Troubleshooting

Examples of Abnormal Wave Pattern

D Example 1

Cause of problem

Motor is malfunctioning. (Motor is not operating.)

Wave pattern characteristics

Induced electromotive force from the motor turning does not appear.

D Example 2

Cause of problem

Open circuit in the line between the stepper motor and the engine-A/T-ECU.

Wave pattern characteristics

Current is not supplied to the motor coil on the open circuit side (Voltage does not drop to 0 V). Furthermore, the induced electromotive force waveform at the normal side is slightly different from the normal waveform.

13D-87

13D-88

MPI <4G63> ï Troubleshooting

Oscilliscope

Measurement Method

1. Disconnect the ignition coil connector, and connect the

IGNITION COIL AND POWER TRANSISTOR

Special patterns pickup

special tool test harness set (MB991348) in between (All terminals should be connected).

2. Connect the oscilloscope special patterns pickup to terminal No. 3 of each ignition coil connector in turn.

Alternate Method (Test harness not available)

1. Connect the oscilloscope special patterns pickup to engine-A/T-ECU terminal No. 11 (No. 1 ï No. 4), connection terminal No. 12 (No. 2 ï No.3) respectively.

Standard Wave Pattern Observation condition

Function Special patterns

Pattern height Low

Pattern selector Display

Engine r/min Approximately 1,200 r/min

Standard wave pattern

Crank angle sensor output wave pattern

Power transistor control signal wave pattern

(V)

T: Revolution time corresponding to a crank angle of 180_ T1: Time computed by the engine-A/T-ECU T: Spark advance angle

75_BTDC

5_BTDC

Compression top dead center

Ignition period

OFF ON

Dwell section

MPI <4G63> ï Troubleshooting

13D-89

Wave Pattern Observation Points

Point: Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wave pattern examples 1 and 2).

Condition of wave pattern build-up section and maximum voltage Probable cause

Rises from approximately 2 V to approximately 4.5 V at the top-right

2 V rectangular wave Open-circuit in ignition primary circuit

Rectangular wave at power voltage Power transistor malfunction

Normal

Examples of Abnormal Wave Patterns

Normal wave pattern

D Example 1

Wave pattern during engine cranking

Cause of problem

Open-circuit in ignition primary circuit

Wave pattern characteristics

Topïright part of the buildïup section cannot be seen, and voltage value is approximately 2 V too low.

D Example 2

Normal wave pattern

Wave pattern during engine cranking

Cause of problem

Malfunction in power transistor

Wave pattern characteristics

Power voltage results when the power transistor is ON.

13D-90

Areas on throttle valve to apply molybdenum disulfide

MPI <4G63> ï On-vehicle Service

ON-VEHICLE SERVICE

THROTTLE BODY (THROTTLE VALVE AREA) CLEANING

1. Remove the air intake hose from the throttle body.

2. Spray cleaning fluid on a clean cloth.

Caution D Do not spray the cleaning fluid directly to the

15 mm

3. Wipe off the dirt around the throttle valve with the cloth

4. Attach the air intake hose.

5. Adjust the basic idle speed (Refer to P.13D-91.)

throttle valve.

D Make sure the cleaning fluid does not enter the

motor from the bypass line. Also make sure it does not enter the sensor through the shaft.

D Be careful not to rub off the molybden applied

around the throttle valve shaft.

sprayed with cleaning fluid.

Throttle position sensor

Equipment side connector

Throttle position sensor

MB991536

THROTTLE POSITION SENSOR ADJUSTMENT

1. Connect the M.U.T.-II/III to the diagnosis connector. When not using the M.U.T.-II/III, proceed as follows.

(1) Disconnect the throttle position sensor connector and

connect the special tool test harness (MB991536) between the disconnected connector taking care not to confuse the terminal to be connected.

(2) Connect digital voltmeter between the terminal No.

2 (special tool’s yellow clip on the sensor output) and the terminal No. 4 (special tool’s red clip on the sensor earth) of the throttle position sensor connector.

2. Turn the ignition switch to ”ON” position (but do not start the engine).

3. Check the output voltage of the throttle position sensor.

Standard value: 535 ï 735 mV

MPI <4G63> ï On-vehicle Service

4. If not within the standard value, loosen the throttle position sensor mounting bolts. Then rotate the sensor body to adjust.

5. Turn the ignition switch to ”LOCK” (OFF) position.

6. Remove the M.U.T.-II/III. If the M.U.T.-II/III is not used, remove the special tool, and then connect the throttle position sensor connector.

7. If a diagnosis code is displayed, erase the diagnosis code by using the M.U.T.-II/III or disconnect the negative battery cable from the battery terminal and then leave it for at least 10 seconds. After that, reconnect the battery cable, and then let the engine run at idle for approximately 10 minutes.

13D-91

BASIC IDLE SPEED ADJUSTMENT

Caution D The standard idling speed has been adjusted by the

speed adjusting screw (SAS) by the manufacturer, and there should usually be no need for readjustment.

D If the adjustment has been changed by mistake, the

idle speed may become too high or the idle speed may drop too low when loads from components such as the A/C are placed on the engine. If this occurs, adjust by the following procedure.

D The adjustment, if made, should be made after first

confirming that the spark plugs, the injectors, the idle speed control servo, the compression pressure, etc., are all normal.

1. Before inspection and adjustment, set the vehicle to the pre-inspection condition.

2. Connect the M.U.T.-II/III to the diagnosis connector (16-pin).

NOTE When the M.U.T.-II/III is connected, the diagnosis control terminal should be earthed.

3. Start the engine and run at idle.

4. Select the item No. 30 of the M.U.T.-II/III actuator test.

NOTE This holds the ISC servo at the basic step to adjust the basic idle speed.

5. Check the idle speed.

Standard value: 750 r 50 r/min

13D-92

MPI <4G63> ï On-vehicle Service

NOTE (1) The engine speed may be 20 to 100 r/min lower

than indicated above for a new vehicle [driven approximately 500 km or less], but no adjustment is necessary.

(2) If the engine stalls or the engine speed is low even

though the vehicle has been driven approximately 500 km or more, it is probable that deposits are adhered to the throttle valve, so clean it (Refer to P.13D-90.)

6. If not within the standard value range, turn the speed adjusting screw (SAS) to make the necessary adjustment.

NOTE If the idling speed is higher than the standard value range even when the SAS is fully closed, check whether or not there is any indication that the fixed SAS has been moved. If there is an indication that it has been moved, adjust the fixed SAS.

7. Press the M.U.T.-II/III clear key, and release the ISC servo from the actuator test mode.

NOTE Unless the ISC servo is released, the actuator test mode will continue 27 minutes.

8. Turn the ignition switch to ”LOCK” (OFF) position.

9. Disconnect the M.U.T.-II/III.

10. Start the engine again and let it run at idle speed for about 10 minutes; check that the idling condition is normal.

Delivery pipe

MB991637

Gasket

MD998709

MD998742

High-pressure fuel hose

FUEL PRESSURE TEST

1. Release residual pressure from the fuel pipe line to prevent fuel gush out.

Caution Cover the hose connection with rags to prevent splash of fuel that could be caused by some residual pressure in the fuel pipe line.

2. Disconnect the high-pressure fuel hose at the delivery pipe side.

3. Assemble the fuel pressure measurement tools as follows.

<When using the fuel pressure gauge set (special tool)> (1) Remove the union joint and bolt from the special

tool adaptor hose (MD998709) and attach the special tool hose adaptor (MD998742) to the adaptor hose.

(2) Via a gasket, install the special tool fuel pressure

gauge set (MB991637 or MB991981) into the special tool that has already assembled as described in (a) above.

Delivery pipe

MB991981

Gasket

MD998709

MD998742

High-pressure fuel hose

MPI <4G63> ï On-vehicle Service

<When using the fuel pressure gauge> (1) Remove the union joint and bolt from special tool

adaptor hose (MD998709) and attach the special tool hose adaptor (MD998742) to the adaptor hose.

(2) Via a suitable O-ring or gasket, install the fuel pressure

gauge to the special tool that has already assembled as described in (a) above.

13D-93

Delivery pipe

Vacuum hose

Fuel pressure gauge set

O-ring or gasket

MD998709

MD998742

High-pressure fuel hose

4. Install the assembled fuel pressure measurement tools between the fuel rail and high-pressure fuel hose.

Caution To prevent damage to the M.U.T.-II/III, always turn the ignition switch to the ”LOCK” (OFF) position before connecting or disconnecting the M.U.T.-II/III

5. Connect the M.U.T.-II/III to the diagnosis connector.

6. Turn the ignition switch to ”ON” position (But do not start the engine)

7. Select ”Item No. 07” from the M.U.T.- II/III actuator test to drive the fuel pump. Check that there are no fuel leaks from any parts.

8. Finish the actuator test or turn the ignition switch to ”LOCK” (OFF) position.

9. Start the engine and run at idle.

10. Fuel pressure measurement while the engine is running at idle.

Standard value: Approximately 265 kPa at kerb idle

11. Disconnect the vacuum hose from the fuel pressure regulator and measure fuel pressure with the hose end closed by a finger.

Standard value: 324 ï 343 kPa at kerb idle

12. Check to see that fuel pressure at idle does not drop even after the engine has been raced several times.

13. Racing the engine repeatedly, hold the fuel return hose lightly with fingers to feel that fuel pressure is present in the return hose.

13D-94

Fuel

MPI <4G63> ï On-vehicle Service

NOTE If the fuel flow rate is low, there will be no fuel pressure in the return hose.

14. If any of fuel pressure measured in steps 10 to 13 is out of specification, troubleshoot and repair according to the table below.

Symptom Probable cause Remedy

D Fuel pressure too low D D No fuel pressure in fuel return

Fuel pressure too high Binding valve in fuel pressure

Same fuel pressure when vacuum hose is connected and when disconnected

pressuredrops after racing

hose

Clogged fuel filter Replace fuel filter

Fuel leaking to return side due to poor fuel regulator valve seating or settled spring

Low fuel pump delivery pressure Replace fuel pump

regulator

Clogged fuel return hose or pipe Clean or replace hose or pipe

Damaged vacuum hose or Clogged nipple

Replace fuel pressure regulator

Replace vacuum hose or clean nipple

15. Stop the engine and check change of fuel pressure gauge reading. Normal if the reading does not drop within 2 minutes. If it does, observe the rate of drop and troubleshoot and repair according to the table below.

Symptom Probable cause Remedy

Fuel pressure drops gradually after engineisstoppe

Leaky injector Replace injector

Leaky fuel regulator valve seat Replace fuel pressure regulator

Fuel pressure drops sharply immediately after engine is stopped

Check valve in fuel pump is held open Replace fuel pump

16. Release residual pressure from the fuel pipe line.

Caution Cover the hose connection with rags to prevent splash of fuel that could be caused by some residual pressure in the fuel pipe line.

17. Remove the fuel pressure gauge and special tool from the delivery pipe.

18. Replace the O-ring at the end of the fuel high pressure hose with a new one. Furthermore, apply engine oil to the new O-ring before replacement.

19. Fit the fuel high pressure hose over the delivery pipe and tighten the bolt to specified toque.

Tightening torque: 5.0 r 1.0 N·m

20. Check for any fuel leaks by following the procedure in step 7.

21. Disconnect the M.U.T.-II/III.

MPI <4G63> ï On-vehicle Service

)

13D-95

COMPONENT LOCATION

Name Symbol Name Symbol

Air flow sensor (with intake air temperature sensor and

arometric pressure sensor

A/C compressor relay H Fuel pump relay (1) and (2) R

A/C switch U Idle speed control servo E

Camshaft position sensor O Ignition coil L

Crank angle sensor B Injector C

Detonation sensor J Oxygen sensor (front) K

Diagnosis connector T Oxygen sensor (rear) Q

EGR control solenoid valve I Power steering fluid pressure switch A

Engine control relay H Purge control solenoid valve I

Engine coolant temperature sensor N Throttle position sensor D

Engine-A/T-ECU V Vehicle speed sensor F

A B

D E F G H

Engine warming lamp (check engine lamp)

Fan controller M

R S T U V

I J K L M N O P

Mitsubishi Lancer 2006 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual