Mitsubishi FUEL, MPI 4G6, MPI 6A1 USER MANUAL
FUEL
CONTENTS
MULTIPOINT FUEL INJECTION (MPI) 13A....................................
GASOLINE DIRECT INJECTION (GDI) 13I...................................
13A-1
13A-2
MULTIPOINT FUEL
INJECTION (MPI)
CONTENTS
MULTIPOINT FUEL INJECTION (MPI)
<4G6> 3..............................
GENERAL 3...............................
Outline of Changes 3........................
GENERAL INFORMATION 3................
Self-diagnosis Function 3.....................
General Specifications 3.....................
SERVICE SPECIFICATIONS 3..............
TROUBLESHOOTING 4....................
Diagnosis Function 4........................
Fail-safe Function Reference Table 7..........
Inspection Chart for Diagnosis Codes 8.......
Inspection Procedure Classified by Diagnosis
Code 10....................................
Inspection Chart for Trouble Symptoms 45.....
Inspection Procedure for Trouble Symptoms
Data List Reference Table 75.................
Actuator Test Reference Table 80.............
Check at the Engine-ECU Terminals 81.......
Inspection Procedure Using an Analyzer 88....
ON-VEHICLE SERVICE 89.................
Oxygen Sensor Check 89....................
MULTIPOINT FUEL INJECTION (MPI)
<6A1> 91.............................
GENERAL 91..............................
Outline of Changes 91.......................
GENERAL INFORMATION 91...............
Self-diagnosis Function 91....................
General Specifications 91....................
Multipoint Fuel Injection System Diagram 92...
SERVICE SPECIFICATIONS 93.............
TROUBLESHOOTING 94...................
Diagnosis Function 94.......................
Fail-safe Function Reference Table 98.........
Inspection Chart for Diagnosis Codes 99......
Inspection Procedure Classified by Diagnosis
Code 101...................................
Inspection Chart for Trouble Symptoms 145....
46.........................................
Inspection Procedure for Trouble Symptoms
146........................................
Data List Reference Table 176................
Actuator Test Reference Table 183............
Check at the Engine-ECU Terminals 185......
Inspection Procedure Using an Analyzer 192...
ON-VEHICLE SERVICE 193...............
Oxygen Sensor Check 193...................
MPI <4G6> -
General/General Information/Service Specifications
13A-3
MULTIPOINT FUEL INJECTION (MPI) <4G6>
GENERAL
OUTLINE OF CHANGES
Due to the changes shown below, the service procedures regarding the different description from the
previous version have been established.
On-board Diagnostics System has been adopted to expand the diagnostic items and to change diagnosis
D
code numbering system.
The engine-ECU has been changed. <Vehicles with M/T>
D
An engine-A/T-ECU has been adopted. <Vehicles with A/T>
D
An ignition failure sensor has been adopted.
D
The injector has been changed.
D
The oxygen sensor has been changed.
D
GENERAL INFORMATION
SELF-DIAGNOSIS FUNCTION
Following functions have been added.
The engine-ECU records the engine operating condition when the diagnosis code is set. This data
D
is called “freeze frame” data. It can be read by using the MUT-II, and can be used in simulation
tests for troubleshooting.
GENERAL SPECIFICATIONS
Items Specifications
Engine-ECU <M/T> Identification model No. E2T67693
Engine-A/T-ECU <A/T> Identification model No. E6T30571
Actuators Injector identification mark CDH240
SERVICE SPECIFICATIONS
Items Standard value
Oxygen sensor output voltage V 0.6 - 1.0
Oxygen sensor heater coil resistance (at 20_C) front 4.5 - 8.0
W
rear 11 - 18
13A-4
MPI <4G6> -
TROUBLESHOOTING
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
Engine warning lamp
(check engine lamp)
Engine warning lamp inspection items
Code No. Diagnosis item
- Engine-ECU <M/T> or engine-A/T-ECU <A/T>
P0100 Air flow sensor system
P0105 Barometric pressure sensor system
code output.
However, the warning lamp will illuminate as bulb check for
five seconds whenever the ignition switch is turned to the
ON position.
Troubleshooting
P0110 Intake air temperature sensor system
P0115 Engine coolant temperature sensor system
P0120 Throttle position sensor system
P0125 Feedback system
P0130 Oxygen sensor (front) system <sensor 1>
P0135 Oxygen sensor heater (front) system <sensor 1>
P0136 Oxygen sensor (rear) system <sensor 2>
P0141 Oxygen sensor heater (rear) system <sensor 2>
P0170 Abnormal fuel system
P0201 No. 1 injector system
P0202 No. 2 injector system
P0203 No. 3 injector system
P0204 No. 4 injector system
P0300
Ignition coil (power transistor) system
L
P0301 No. 1 cylinder misfire detected
P0302 No. 2 cylinder misfire detected
P0303 No. 3 cylinder misfire detected
P0304 No. 4 cylinder misfire detected
P0335 Crank angle sensor system
P0340 Camshaft position sensor system
MPI <4G6> -
MPI <4G6> -
Code No. Diagnosis item
P0403 EGR valve system
P0420 Catalyst malfunction
P0443 Purge control solenoid valve system
P0505 Idle speed control system
P0510 Idle position switch system
P0551 Power steering fluid pressure switch system
NOTE
1. If the engine warning lamp illuminates because of a malfunction of the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, communication between MUT-IIand the engine-ECU <M/T> or engine-A/T-ECU
<A/T> is impossible. In this case, the diagnosis code cannot be read.
2. After the engine-ECU <M/T> or engine-A/T-ECU <A/T> has detected a malfunction, the engine warning
lamp illuminates when the engine is next turned on and the same malfunction is re-detected. However,
for items marked with a “L” in the diagnosis code number column, the engine warning lamp illuminates
only on the first detection of the malfunction.
3. After the engine warning lamp illuminates, it will be switched off under the following conditions.
(1) When the engine-ECU <M/T> or engine-A/T-ECU <A/T> monitored the power train malfunction
three times* and met set condition requirements, it detected no malfunction.
*: In this case, “one time” indicates from engine start to stop.
(2) For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature,
etc.) are similar to those when the malfunction was first recorded.
4. Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.
Troubleshooting
Troubleshooting
13A-5
METHOD OF READING AND ERASING DIAGNOSIS
CODES
Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points.
DIAGNOSIS USING DIAGNOSIS 2 MODE
1. Switch the diagnosis mode of the engine control unit
to DIAGNOSIS 2 mode using the MUT-II.
2. Carry out a road test.
3. Take a reading of the diagnosis code and repair the
problem location.
4. Turn the ignition switch to OFF and then back to ON
again.
NOTE
By turning the ignition switch to OFF, the ENGINE-ECU
will switch the diagnosis mode from DIAGNOSIS 2 mode
to DIAGNOSIS 1 mode.
5. Erase the diagnosis codes.
13A-6
MPI <4G6> -
INSPECTION USING MUT-IIDATA LIST AND ACTUATOR
TESTING
1. Carry out inspection by means of the data list and the
2. After repairing, re-check using the MUT-IIand check that
3. Erase the diagnosis code memory.
4. Remove the MUT-II, and then start the engine again and
FREEZE FRAME DATA
When the engine-ECU <M/T> or engine-A/T-ECU <A/T>
detects a malfunction and stores a diagnosis code, it also
stores a current status of the engine. This function is called
“Freeze frame data.” By analyzing this “freeze frame” data
with the MUT-II, an effective troubleshooting can be
performed.
The display items of freeze frame data are shown below.
Troubleshooting
actuator test function. If there is an abnormality, check
and repair the chassis harnesses and components.
the abnormal input and output have returned to normal
as a result of the repairs.
carry out a road test to confirm that the problem has
disappeared.
Display item list
Data item Unit
Engine coolant temperature sensor _C
Engine speed r/min
Vehicle speed km/h
Long-term fuel compensation (long-term
fuel trim)
Short-term fuel compensation (short-term
fuel trim)
Fuel control condi- Open loop OL
tion
Closed loop CL
Open loop owing to
drive condition
Open loop owing to
system malfunction
Closed loop based
on one oxygen sensor
%
%
OL-DRV.
OL-SYS.
CL-H02S
Calculation load value %
Diagnosis code during data recording -
NOTE
If malfunctions have been detected in multiple systems, store
one malfunction only, which has been detected first.
MPI <4G6> -
Troubleshooting
13A-7
READINESS TEST STATUS
The engine-ECU <M/T> or engine-A/T-ECU <A/T> monitors
the following main diagnosis items, judges if these items are
in good condition or not, and the stores its history. This
history can be read out by using MUT-II. (If the ECU has
judged a item before, the MUT-IIdisplays “Complete.”)
In addition, if diagnosis codes are erased or the battery
cable is disconnected, this history will also be erased (the
memory will be reset).
Catalyst: P0420
D
Oxygen sensor: P0130
D
Oxygen sensor heater: P0135, P0141
D
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
Detonation sensor Switches the ignition timing from ignition timing for super petrol to ignition timing for standard
Ignition coil, power
transistor
Oxygen sensor (front) Air/fuel ratio feedback control (closed loop control) is not performed.
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 to all cylinders simultaneously.
(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.
petrol.
Cuts off the fuel supply to cylinders with an abnormal ignition.
Oxygen sensor (rear) Performs the feedback control (closed loop control) of the air/fuel ratio by using only the
signal of the oxygen sensor (front) installed on the front of the catalytic converter.
Alternator FR terminal Does not control the output of the alternator according to an electrical load. (works as a
normal alternator)
Misfiring If the detected misfiring causes damage to the catalyst, the misfiring cylinder will be shut
down.
13A-8
MPI <4G6> -
Troubleshooting
INSPECTION CHART FOR DIAGNOSIS CODES
Code No. Diagnosis item Reference page
P0100 Air flow sensor system 13A-10
P0105 Barometric pressure sensor system 13A-12
P0110 Intake air temperature sensor system 13A-14
P0115 Engine coolant temperature sensor system 13A-16
P0120 Throttle position sensor system 13A-18
P0125 Feedback system 13A-20
P0130 Oxygen sensor (front) system <sensor 1> 13A-21
P0135 Oxygen sensor heater (front) system <sensor 1> 13A-23
P0136 Oxygen sensor (rear) system <sensor 2> 13A-24
P0141 Oxygen sensor heater (rear) system <sensor 2> 13A-26
P0170 Abnormal fuel system 13A-27
P0201 No. 1 injector system 13A-28
P0202 No. 2 injector system 13A-28
P0203 No. 3 injector system 13A-28
P0204 No. 4 injector system 13A-28
P0300
P0301 No. 1 cylinder misfire detected 13A-31
P0302 No. 2 cylinder misfire detected 13A-31
P0303 No. 3 cylinder misfire detected 13A-31
P0304 No. 4 cylinder misfire detected 13A-31
P0325 Detonation sensor system 13A-32
P0335 Crank angle sensor system 13A-32
P0340 Camshaft position sensor system 13A-34
P0403 EGR valve system 13A-36
P0420 Catalyst malfunction 13A-37
Ignition coil (power transistor) system 13A-29
L
P0443 Purge control solenoid valve system 13A-38
P0500 Vehicle speed sensor system 13A-39
P0505 Idle speed control system 13A-39
P0510 Idle position switch system 13A-41
P0551 Power steering fluid pressure switch system 13A-42
P1500 Alternator FR terminal system 13A-43
P1610 Immobilizer system 13A-44
MPI <4G6> -
NOTE
1. Do not replace the engine-ECU <M/T> or engine-A/T-ECU <A/T> until a through terminal check reveals
there are no short/open circuit.
2. Check that the engine-ECU <M/T> or engine-A/T-ECU <A/T> earth circuit is normal before checking
for the cause of the problem.
3. After the engine-ECU <M/T> or engine-A/T-ECU <A/T> has detected a malfunction, a diagnosis code
is recorded the next time the engine is started and the same malfunction is re-detected. However,
for items marked with a “L”, the diagnosis code is recorded on the first detection of the malfunction.
4. Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.
Troubleshooting
13A-9
13A-10
MPI <4G6> -
Troubleshooting
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No. P0100 Air flow sensor system Probable cause
Range of Check
Engine speed: 500 r/min or more
D
Set Conditions
The sensor output frequency is 3.3 Hz or less for four seconds.
D
Malfunction of air flow sensor
D
Open or short circuit in air flow sensor circuit or
D
loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
MUT-IIData list
12 Air flow sensor (Refer to
P.13A-75, DATA LIST
REFERENCE TABLE.)
NG
Check the following connector:
B-12
OK
Measure at air flow sensor connector
B-12.
Disconnect the connector and
D
measure at the harness side.
(1) Voltage between terminal 3 and
earth (Ignition switch: ON)
OK:
(2) Voltage between terminal 4 and
(3) Resistance between terminal 5
To the next page
4.8 - 5.2 V
earth (Ignition switch: ON)
OK:
System voltage
and earth
OK:
2Wor less
OK
OK
NG
(1) NG
(2) NG
(3) NG
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Repair
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-176 <A/T>.
Measure the voltage at the
D
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
Ignition switch: ON
D
Voltage between terminal 90
D
<M/T>, 65 <A/T> and earth
OK:
4.8 - 5.2 V
NG
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
Check the following connector:
C-31
OK
Check the harness between the air
flow sensor and the engine control
relay, and repair if necessary.
Check the following connectors:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
OK
NG
NG
NG
NG
NG
NG
NG
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Repair
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NG
Repair
From the previous page
OK
Measure at air flow sensor connector
B-12.
Use test harness (MB991709) to
D
connect the connector, and
measure at the pick-up harness.
Ignition switch: ON
D
Voltage between terminal 7 and
D
earth
OK:
7-8V
OK
Measure at air flow sensor connector
B-12.
Use test harness (MB991709) to
D
connect the connector, and
measure at the pick-up harness.
Voltage between terminal 7 and
D
earth
OK:
Engine: Idling
0-1V
Engine speed: 3,000 r/min
6-9V
OK
Measure the output waveform at air
flow sensor connector B-12 (by
using an analyzer).
Use test harness (MB991709) to
D
connect the connector, and
measure at the pick-up harness.
Engine: Idling
D
Voltage between terminal 3 and
D
earth
OK:
Waveforms should be displayed on P.13A-88 (Inspection Procedure Using
an Analyzer) and noise
should not be displayed in
the waveform.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
MPI <4G6> -
NG
NG
NG
Check the following connector:
C-34 <M/T>, C-177 <A/T>
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
Replace the air flow sensor.
Check the following connector:
C-34 <M/T>, C-177 <A/T>
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
Check the trouble symptoms.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Replace the air flow sensor.
Check the trouble symptoms.
Check the following connectors:
C-40 <M/T>, C-176 <A/T>, C-31
Check the harnesses between the
air flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T> and
between the air flow sensor and the
engine control relay, and repair if
necessary.
Troubleshooting
NG
OK
NG
OK
NG
OK
OK
NG
NG
OK
NG
NG
13A-11
Repair
Repair
Repair
Repair
Repair
13A-12
MPI <4G6> -
Troubleshooting
Code No. P0105 Barometric pressure sensor system Probable cause
Range of Check
Two seconds have passed since the ignition switch is turned ON or the
D
engine starting process is completed.
Battery voltage: 8 V or more
D
Set Conditions
The sensor output voltage is 4.5 V or more for four seconds (equivalent to
D
114 kPa of barometric pressure)
or
The sensor output voltage is 0.2 V or less (equivalent to 53 kPa of
D
barometric pressure)
Malfunction of barometric pressure sensor
D
Open or short circuit in barometric pressure
D
sensor circuit or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
MUT-IIData list
25 Barometric pressure sensor
(Refer to P.13A-75, DATA LIST
REFERENCE TABLE.)
NG
Check the following connector:
B-12
OK
Measure at air flow sensor connector
B-12.
Disconnect the connector and
D
measure at the harness side.
(1) Voltage between terminal 1 and
earth (Ignition switch: ON)
OK:
(2) Resistance between terminal 5
4.8 - 5.2 V
and earth
OK:
2Wor less
OK
NG
(1) NG
(2) NG
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Repair
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-176 <A/T>.
Measure the voltage at the
D
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
Ignition switch: ON
D
Voltage between terminal 81
D
<M/T>, 46 <A/T> and earth
OK:
4.8 - 5.2 V
NG
Check the following connectors:
C-40 <M/T>, C-176 <A/T>, C-47
<RHD>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
Check the following connector:
C-40 <M/T>, C-176<A/T>
OK
NG
NG
NG
NG
OK
Check the following connectors:
C-40 <M/T>, C-176 <A/T>, C-47
<RHD>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Repair
NG
Repair
To the next page
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
NG
NG
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
From the previous page
OK
Measure at air flow sensor connector
B-12.
Connect connector terminals No.
D
1, No. 2 and No. 5 only by using
test harness (MB991709), and
measure at the pick-up harness.
Ignition switch: ON
D
(1) Voltage between terminal 1 and
earth
OK:
(2) Voltage between terminal 2 and
(3) Voltage between terminal 5 and
4.8 - 5.2 V
earth
OK:
Altitude 0 m: 3.7 - 4.3 V
Altitude 1,200 m:
3.2 - 3.8 V
earth
OK:
0.5 V or less
OK
MPI <4G6> -
(1) NG
(3) NG
(2) NG
Check the following connectors:
C-40 <M/T>, C-176 <A/T>, C-47
<RHD>
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.
Replace the air flow sensor.
Check the trouble symptoms.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.
Troubleshooting
NG
OK
NG
NG
OK
13A-13
Repair
Repair
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-176 <A/T>.
Measure the voltage at the
D
engine-ECU terminal.
Ignition switch: ON
D
Voltage between terminal 85
D
<M/T>, 55 <A/T> and earth
OK:
Altitude 0 m: 3.7 - 4.3 V
Altitude 1,200 m:
3.2 - 3.8 V
NG
OK
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NG
NG
Repair
Repair
13A-14
MPI <4G6> -
Troubleshooting
Code No. P0110 Intake air temperature sensor system Probable cause
Range of Check
Two seconds have passed since the ignition switch is turned ON or the
D
engine starting process is completed.
Set Conditions
The sensor output voltage is 4.6 V or more for four seconds (equivalent to
D
-45_C of intake air temperature)
or
The sensor output voltage is 0.2 V or more for four seconds (equivalent to
D
125_C of intake air temperature)
Malfunction of intake air temperature sensor
D
Open or short circuit in intake air temperature
D
sensor or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
MUT-IIData list
13 Intake air temperature sensor
OK:
Roughly the same as ambient temperature.
NG
Check the intake air temperature
sensor itself.
(Refer to P.13A-90*.)
OK
Check the following connector:
B-12
OK
Measure at air flow sensor connector
B-12.
Disconnect the connector and
D
measure at the harness side.
(1) Resistance between terminal 5
and earth
OK:
(2) Voltage between terminal 6 and
2Wor less
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
OK
NG
NG
(1) NG
(2) NG
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Repair
Repair
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-176 <A/T>.
Measure the voltage at the
D
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
Disconnect connector B-12.
D
Ignition switch: ON
D
Voltage between terminal 62
D
<M/T>, 64 <A/T> and earth
OK:
4.8 - 5.2 V
NG
NG
NG
NG
OK
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.
NG
Repair
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
OK
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
To the next page
NG
NG
NG
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
From the previous page
OK
Measure at air flow sensor connector
B-12.
Use the test harness (MB991709)
D
to connect only terminals 5 and
6, and then measure at the
pick-up harness.
Ignition switch: ON
D
Voltage between terminal 6 and
D
earth
OK:
Ambient temperature 0_C:
3.2 - 3.8 V
Ambient temperature 20_C:
2.3 - 2.9 V
Ambient temperature 40_C:
1.5 - 2.1 V
Ambient temperature 80_C:
0.4 - 1.0 V
OK
Check the trouble symptoms.
MPI <4G6> -
NG
NG
Check the following connector:
C-40 <M/T>, C-176 <A/T>
Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Troubleshooting
NG
OK
13A-15
Repair
13A-16
MPI <4G6> -
MPI <4G6> -
Troubleshooting
Troubleshooting
Code No. P0115 Engine coolant temperature sensor
system
Range of Check
Engine: Two seconds after the engine has been started
D
Set Conditions
The sensor output voltage is 4.6 V or more for four seconds (equivalent to
D
-45_C or lower of engine coolant temperature)
or
The sensor output voltage is 0.1 V or less for four seconds (equivalent to
D
140_C or higher of engine coolant temperature)
Range of Check
Engine: After starting
D
Set Conditions
The engine coolant temperature has reduced from over 40_C to less than
D
40_C, and that condition has lasted for five minutes or more.
MUT-IIData 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 80 120_C.
NG
Measure at engine coolant
temperature sensor connector B-33.
Disconnect the connector and
D
measure at the harness side.
Resistance between terminals 1
D
and 2
OK:
At 20_C of engine coolant
temperature: 2.1 - 2.7 k
At 80_C of engine coolant
temperature: 0.26 - 0.36
k
W
OK
OK
NG
W
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Replace
Probable cause
Malfunction of engine coolant temperature sensor
D
Open or short circuit in the engine coolant
D
temperature sensor circuit or loose connector
contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
Check the following connector:
B-33
OK
To the next page
NG
Repair
From the previous page
OK
Measure at engine coolant
temperature sensor connector B-33.
Disconnect the connector and
D
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK:
(2) Resistance between terminal 2
Measure at engine coolant
temperature sensor connector B-33.
D
D
D
Check the trouble symptoms.
4.8 - 5.2 V
and earth
OK:
2Wor less
OK
Use test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
Ignition switch: ON
Voltage between terminal 1 and
earth
OK:
At 0_C of engine coolant
temperature: 3.2 - 3.8 V
At 20_C of engine coolant
temperature: 2.3 - 2.9 V
At 40_C of engine coolant
temperature: 1.3 - 1.9 V
At 80_C of engine coolant
temperature: 0.3 - 0.9 V
OK
MPI <4G6> -
(1) NG
(2) NG
NG
NG
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-176 <A/T>.
D
D
D
D
Check the following connector:
C-40 <M/T>, C-176 <A/T>
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the trouble symptoms.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the trouble symptoms.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
Troubleshooting
Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
Disconnect connector B-33.
Ignition switch: ON
Voltage between terminal 83
<M/T>, 44 <A/T> and earth
OK:
4.8 - 5.2 V
NG
OK
OK
OK
OK
Check the engine coolant
temperature sensor.
(Refer to P.13A-90*.)
OK
OK
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NG
NG
NG
NG
NG
OK
NG
NG
NG
13A-17
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
engine coolant temperature sensor
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Repair
Repair
NG
Repair
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
13A-18
MPI <4G6> -
Troubleshooting
Code No. P0120 Throttle position sensor system Probable cause
Range of Check
Excluding two seconds after the ignition switch is turned ON or immediately
D
after the engine starts.
Set Conditions
When the idle position switch is ON, the sensor output voltage is 2 V or
D
more for 4 seconds
or
The sensor output voltage is 0.2 V or less for 4 seconds
D
Malfunction of throttle position sensor
D
Improper connector contact, open circuit or
D
short-circuited harness wire
Improper “ON” state of idle position switch
D
Short circuit of the idle position switch signal line
D
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
MUT-IIData list
14 Throttle position sensor
(Refer to P.13A-75, DATA LIST
REFERENCE TABLE.)
NG
Check the throttle position sensor.
(Refer to P.13A-91*.)
OK
Check the following connector:
B-07
OK
Measure at throttle position sensor
connector B-07.
Disconnect the connector and
D
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK:
(2) Resistance between terminal 4
To the next page
4.8 - 5.2 V
and earth
OK:
2Wor less
OK
OK
NG
NG
(1) NG
(2) NG
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Replace
Repair
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-176 <A/T>.
Measure the voltage at the
D
engine-ECU <M/T> or
engine-A/T-ECU <A/T> connector
terminals.
Ignition switch: ON
D
Voltage between terminal 81 and
D
earth
OK:
4.8 - 5.2 V
NG
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
OK
NG
NG
NG
NG
NG
NG
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NG
Repair
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
From the previous page
OK
Measure at throttle position sensor
connector B-07.
Use test harness (MB991536) to
D
connect the connector, and
measure at the pick-up harness.
Ignition switch: ON
D
(1) Voltage between terminal 1 and
earth
OK:
(2) Voltage between terminal 4 and
(3) Voltage between terminal 2 and
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-175 <A/T>.
D
D
D
4.8 - 5.2 V
earth
OK:
0.5 V or less
earth
OK:
Accelerator pedal fully released: 0.3 - 1.0 V
Accelerator pedal fully depressed: 4.5 - 5.5 V
OK
Measure voltage at the
engine-ECU terminal.
Ignition switch: ON
Voltage between terminal 84
<M/T>, 78 <A/T> and earth
OK:
Accelerator pedal fully released: 0.3 - 1.0 V
Accelerator pedal fully depressed: 4.5 - 5.5 V
MPI <4G6> -
(1) NG
(2) NG
(3) NG
NG
OK
Check the following connector:
C-40 <M/T>, C-176 <A/T>
Check the harness wire between the
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Adjust the throttle position sensor.
(Refer to P.13A-81*.)
Check the following connector:
C-40 <M/T>, C-175 <A/T>
Check the harness wire between the
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the following connector:
C-40 <M/T>, C-175 <A/T>
Check the harness wire between the
throttle position sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the following connector:
C-40 <M/T>, C-175<A/T>
Check the trouble symptoms.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Troubleshooting
NG
OK
NG
OK
NG
OK
NG
OK
NG
13A-19
Repair
Repair
Repair
Repair
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
13A-20
MPI <4G6> -
Troubleshooting
Code No. P0125 Feedback system Probable cause
Range of Check
The engine coolant temperature is approx. 80_C or more.
D
During stoichiometric feedback control
D
The vehicle is not being decelerated.
D
Set Conditions
Oxygen sensor (front) output voltage has been higher or lower than 0.5 V for
D
at least thirty seconds.
Malfunction of oxygen sensor (front)
D
Open or short circuit in the oxygen sensor (front)
D
circuit or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
Check the following connector:
C-46
OK
Measure at oxygen sensor (front)
connector C-46.
Disconnect the connector and
D
measure at the harness side.
Resistance between terminal 2
D
and earth
OK:
2Wor less
OK
Measure at oxygen sensor (front)
connector C-46.
Measure the voltage at the
D
oxygen sensor (front) terminal
Engine: 2,500 r/min (after
D
warming up)
(1) Voltage between terminal 2 and
earth
OK:
(2) Voltage between terminal 1 and
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-175 <A/T>.
D
D
D
Check the following connector:
C-40 <M/T>, C-175 <A/T>
Check the trouble symptoms.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
0.5 V or less
earth
OK:
0 V and 0.8 V alternate.
OK
Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
Engine: 2,500 r/min (after
warming up)
Voltage between terminal 76
<M/T>, 71 <A/T> and earth
OK:
0 V and 0.8 V alternate.
OK
OK
NG
NG
NG
(1) NG
(2) NG
NG
NG
OK
Repair
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the oxygen sensor (front).
(Refer to P.13A-89.)
OK
Check the following connector:
C-40 <M/T>, C-175 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the following connector:
C-40 <M/T>, C-175 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
NG
NG
NG
NG
Repair
Repair
Repair
Replace
Repair
Repair
MPI <4G6> -
Troubleshooting
13A-21
Code No. P0130 Oxygen sensor (front) system <sensor
1>
Range of Check
Three minutes have been passed since the engine has been started.
D
The engine coolant temperature is approx. 80_C or more.
D
Engine speed is 1,200 r/min or more
D
Driving on a level surface at constant speed.
D
Set Conditions
The oxygen sensor (front) output voltage is 4.5 V or more when the sensor
D
output voltage is 0.2 V or less and a voltage of 5 V is applied to the oxygen
sensor (front) inside the engine-ECU.
Range of Check
Engine speed is 2,800 r/min or less
D
During driving
D
During air/fuel ratio feedback control
D
Set Conditions
The oxygen sensor (front) output frequency is s ix or less per 10 seconds on
D
average.
Probable cause
Malfunction of oxygen sensor (front)
D
Open or short circuit in the oxygen sensor (front)
D
circuit or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
13A-22
MPI <4G6> -
Troubleshooting
Check the following connector:
C-46
OK
Measure at oxygen sensor (front)
connector C-46.
Disconnect the connector and
D
measure at the harness side.
Resistance between terminal 2
D
and earth
OK:
2Wor less
OK
Measure at oxygen sensor (front)
connector C-46.
Measure the voltage at the
D
oxygen sensor (front) terminal.
Engine: 2,500 r/min (after
D
warming up)
(1) Voltage between terminal 2 and
earth
OK:
(2) Voltage between terminal 1 and
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-175 <A/T>.
D
D
D
Check the following connector:
C-40 <M/T>, C-175 <A/T>
Check the trouble symptoms.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
0.5 V or less
earth
OK:
0 V and 0.8 V alternate.
OK
Measure the voltage at the
engine-ECU terminal.
Engine: 2,500 r/min (after
warming up)
Voltage between terminal 76
<M/T>, 71 <A/T> and earth
OK:
0 V and 0.8 V alternate.
OK
OK
NG
NG
NG
(1) NG
(2) NG
NG
NG
OK
Repair
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the oxygen sensor (front).
(Refer to P.13A-89.)
OK
Check the following connector:
C-40 <M/T>, C-175 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the following connector:
C-40 <M/T>, C-175 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
NG
NG
NG
NG
Repair
Repair
Repair
Replace
Repair
Repair
MPI <4G6> -
Troubleshooting
13A-23
Code No. P0135 Oxygen sensor heater (front) system
<sensor 1>
Range of Check
The engine coolant temperature is approx. 20_C or more.
D
The oxygen sensor heater (front) remains on.
D
The engine speed is 50 r/min or more.
D
Battery voltage is 11 - 16 V.
D
Set Conditions
The current, which flows through the oxygen sensor heater (front), is 0.2 A
D
or less or 3.5 A or more for six seconds.
Measure at oxygen sensor (front)
connector C-46.
Disconnect the connector and
D
measure at the harness side.
Resistance between terminals 3
D
and 4
OK:
4.5 - 8.0
Check the following connector:
C-46
Measure at oxygen sensor (front)
connector C-46.
Disconnect the connector and
D
measure at the harness side.
Ignition switch: ON
D
Voltage between terminal 3 and
D
earth
OK:
System voltage
Measure at engine-ECU connector
C-38 <M/T> or engine-A/T-ECU
connector C-177 <A/T>.
Measure the voltage at the
D
engine-ECU terminal.
Ignition switch: ON
D
Voltage between terminal 60
D
<M/T>, 3 <A/T> and earth
OK:
System voltage
Check the following connector:
C-38 <M/T>, C-177 <A/T>
Check the harness wires between
the oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T> and between
the oxygen sensor (front) and the
engine control relay.
Check the trouble symptoms.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
W
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
OK
Replace
Repair
Check the following connector:
C-31
OK
Check the harness wires between
the oxygen sensor (front) and the
engine control relay, and repair if
necessary.
Check the following connector:
C-38 <M/T>, C-177 <A/T>
OK
Check the harness wire between the
oxygen sensor (front) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Repair
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Probable cause
Malfunction of oxygen sensor heater (front)
D
Open or short circuit in the oxygen sensor heater
D
(front) circuit or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
NG
NG
Repair
Repair
13A-24
MPI <4G6> -
Troubleshooting
Code No. P0136 Oxygen sensor (rear) system <sensor
2>
Range of Check
Three minutes have been passed since the engine has been started.
D
The engine coolant temperature is approx. 80_C or more.
D
Engine speed is 1,200 r/min or more
D
Driving on a level surface at constant speed.
D
Set Conditions
The oxygen sensor (rear) output voltage is 4.5 V or more when the sensor
D
output voltage is 0.2 V or less and a voltage of 5 V is applied to the oxygen
sensor (rear) inside the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Probable cause
Malfunction of oxygen sensor (rear)
D
Open or short circuit in the oxygen sensor (rear)
D
circuit or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
MPI <4G6> -
Troubleshooting
13A-25
Check the following connector:
C-85
OK
Measure at oxygen sensor (rear)
connector C-85.
Disconnect the connector and
D
measure at the harness side.
Resistance between terminal 2
D
and earth
OK:
2Wor less
OK
Measure at oxygen sensor (rear)
connector C-85.
Measure the voltage at the
D
oxygen sensor (rear) terminal.
Engine: 2,500 r/min (after
D
warming up)
(1) Voltage between terminal 2 and
earth
OK:
(2) Voltage between terminal 1 and
Measure at engine-ECU connector
C-40 <M/T> or engine-A/T-ECU
connector C-175 <A/T>.
D
D
D
Check the following connector:
C-40 <M/T>, C-175 <A/T>
Check the trouble symptoms.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
0.5 V or less
earth
OK:
0 V and 0.8 V alternate.
OK
Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
Engine: 2,500 r/min (after
warming up)
Voltage between terminal 75
<M/T>, 73 <A/T> and earth
OK:
0 V and 0.8 V alternate.
OK
OK
NG
NG
NG
(1) NG
(2) NG
NG
NG
OK
Repair
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the following connector:
C-40 <M/T>, C-176 <A/T>
OK
Check the harness wire between the
oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the oxygen sensor (rear).
(Refer to P.13A-90.)
OK
Check the following connectors:
C-40 <M/T>, C-175 <A/T>
OK
Check the harness wire between the
oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Check the following connector:
C-40 <M/T>, C-175 <A/T>
OK
Check the harness wire between the
oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
NG
NG
NG
NG
Repair
Repair
Repair
Replace
Repair
Repair
13A-26
MPI <4G6> -
Troubleshooting
Code No. P0141 Oxygen sensor heater (rear) system
<sensor 2>
Range of Check
The engine coolant temperature is approx. 20_C or more.
D
The oxygen sensor heater (rear) remains on.
D
The engine speed is 50 r/min or more.
D
Battery voltage is 11 - 16 V.
D
Set Conditions
The current, which flows through the oxygen sensor heater (rear), is 0.2 A or
D
less or 3.5 A or more for six seconds.
Measure at oxygen sensor (rear)
connector C-85.
Disconnect the connector and
D
measure at the harness side.
Resistance between terminals 3
D
and 4
OK:
11 - 18
Check the following connector:
C-85
Measure at oxygen sensor (rear)
connector C-85.
Disconnect the connector and
D
measure at the harness side.
Ignition switch: ON
D
Voltage between terminal 3 and
D
earth
OK:
System voltage
Measure at engine-ECU connector
C-38 <M/T> or engine-A/T-ECU
connector C-177 <A/T>.
Measure the voltage at the
D
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
Ignition switch: ON
D
Voltage between terminal 54
D
<M/T>, 26 <A/T> and earth
OK:
System voltage
Check the following connector:
C-38 <M/T>, C-177 <A/T>
Check the harness wires between
the oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T> and between
the oxygen sensor (rear) and the
engine control relay.
Check the trouble symptoms.
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
W
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
OK
Replace
Repair
Check the following connector:
C-31
OK
Check the harness wires between
the oxygen sensor (rear) and the
engine control relay, and repair if
necessary.
Check the following connector:
C-38 <M/T>, C-177 <A/T>
OK
Check the harness wire between the
oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Repair
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Probable cause
Malfunction of oxygen sensor heater (rear)
D
Open or short circuit in the oxygen sensor heater
D
(rear) circuit or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
NG
NG
Repair
Repair
MPI <4G6> -
Troubleshooting
Code No. P0170 Abnormal fuel system Probable cause
Range of Check
Engine: Being learning the air/fuel ratio
D
Set Conditions
Ten seconds or more have been passed while the fuel injection amount
D
compensation value is too low.
or
Ten seconds or more have been passed while the fuel injection amount
D
compensation value is too high.
Incorrect fuel pressure
D
Malfunction of fuel supply system
D
Malfunction of oxygen sensor (front)
D
Malfunction of intake air temperature sensor
D
Malfunction of barometric pressure sensor
D
Malfunction of air flow sensor
D
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
13A-27
MUT-IIData list
13 Intake air temperature sensor (Refer to P.13A-75.)
OK
MUT-IIData list
21 Engine coolant temperature sensor (Refer to P.13A-75.)
OK
MUT-IIData list
25 Barometric pressure sensor (Refer to P.13A-75.)
OK
Check the injector (Refer to P.13A-93*.)
OK
Check the following connectors:
C-34 <M/T>, C-177 <A/T>, B-02, B-03, B-05, B-36
OK
Check the harness wire between the engine-ECU <M/T> or
engine-A/T-ECU <A/T> and the injector connector.
OK
Check the fuel pressure (Refer to P.13A-85*.)
OK
MUT-IIData list
81 Long-term fuel compensation (Refer to P.13A-75.)
Is fuel trim more or less than zero?
D
Less than zero
MUT-IIData list
12 Volume air flow sensor
(Refer to P.13A-75.)
Does the tester indi-
D
cate more than the
standard value?
Yes
Replace the volume air
flow sensor.
No
Check for fuel leaks
D
from injector.
Check for entry of
D
foreign matter (water,
kerosene,etc.) into the
fuel.
OK
Replace the engine-ECU
<M/T> or engine-A/T-ECU
<A/T>.
NG
NG
NG
NG
NG
NG
More than
zero
Check the intake air temperaturesensor system.(Refer to P.13A-14,
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
CODE P0110.)
Check the engine coolant temperature sensor system. (Refer to
P.13A-16, INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE P0115.)
Check the barometric pressure sensor system. (Refer to P.13A-12,
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
CODE P0105.)
Replace
Repair
Repair
Check if air was drawn into
the intake system.
OK
MUT-IIData list
12 Volume air flow sensor
(Refer to P.13A-75.)
Does the tester indi-
D
cate less than the
standard value?
Yes
Replace the volume air
flow sensor.
NG
No
Repair
Check for clogging of
D
the injector.
Check for clogging of
D
the fuel filter and fuel
line.
Check the fuel pump
D
(insufficient discharge
rate.)
Check for exhaust
D
leaks (oxygen sensor
installation section,
cracks in exhaust
manifold, cracks in
front pipe, etc.).
Check for entry of
D
foreign matter (water,
kerosene,etc.) into the
fuel.
OK
Replace the engine-ECU
<M/T> or engine-A/T-ECU
<A/T>.
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
13A-28
MPI <4G6> -
Troubleshooting
Code No. P0201 No. 1 injector system
Code No. P0202 No. 2 injector system
Code No. P0203 No. 3 injector system
Code No. P0204 No. 4 injector system
Range of Check
Engine speed is approx. 50 - 1,000 r/min
D
The throttle position sensor output voltage is 1.15 V or less.
D
Actuator test by MUT-IIis not carried out.
D
Set Conditions
Surge voltage of injector coil is not detected for 4 seconds.
D
MUT-IIActuator Test
01 No. 1 injector
02 No. 2 injector
03 No. 3 injector
04 No. 4 injector
OK:
The idling condition should change
NG
Check the following connectors:
B-02, B-03, B-05, B-36
OK
Check the injector. (Refer to P.13A-93*.)
OK
Measure at the injector connector B-02, B-03, B-05, B-36.
Disconnect the connector, and measure at the harness side.
D
Voltage between 1 and earth (Ignition switch: ON)
D
OK:
System voltage
OK
Check the following connector:
Measure at the engine-ECU connector C-34 <M/T> or engine-A/TECU connector C-177<A/T>.
Disconnect the connector, and measure at the harness side.
D
Voltage between 1, 2, 14, 15 and earth (Ignition switch: ON)
D
<M/T>
Voltagebetween 1,2, 9,24 and earth (Ignition switch: ON)<A/T>
D
OK:
System voltage
Check trouble symptoms.
Use an analyzer to measure the signal waveform at injector
connector B-02, B-03, B-05, B-36.
Use a test harness (MB991348) to connect the connector, and
D
measure at the pick-up harness side.
Engine: Idling
D
The voltage between terminal 2 and earth
D
OK:
A normal waveform should be displayed as described
on P.13A-88 (INSPECTION PROCEDURE USING
AN ANALYZER).
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
C-34 <M/T>, C-177 <A/T>
OK
OK
NG
NG
OK
NG
NG
NG
NG
NG
OK
Probable cause
Malfunction of the injector
D
Improper connector contact, open circuit or short-cir-
D
cuited harness wire of the injector circuit
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
Intermittent malfunction
(Refer to GROUP 00 - 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-ECU <M/T> or
engine-A/T-ECU <A/T> and the injector connector, and repair if
necessary.
Intermittent malfunction (Refer to GROUP 00 - Points to Note for
Intermittent Malfunctions.)
NOTE:
*: Refer to the ’97 GALANT Workshop Manual (Pub. No. PWDE9611)
MPI <4G6> -
Troubleshooting
Code No. P0300 Ignition coil (power transistor) system Probable cause
Range of Check
Engine speed is approx. 50 - 4,000 r/min.
D
Engine is not cranking.
D
Set Conditions
The ignition failure sensor does not send a signal about a certain cylinder for
D
four seconds.
Malfunction of the ignition coil
D
Malfunction of the ignition failure sensor
D
Malfunction of spark plug
D
Open or short circuit in the primary ignition circuit
D
or loose connector contact
Malfunction of engine-ECU <M/T>
D
Malfunction of engine-A/T-ECU <A/T>
D
13A-29
13A-30
MPI <4G6> -
Troubleshooting
MUT-IIActuator Test
01 No. 1 injector
02 No. 2 injector
03 No. 3 injector
04 No. 4 injector
OK:
The idling condition should
Reference
When the cylinder (defective
cylinder) where idling condition does
not change is detected after
suspending the injector, go to (1)
and inspect the spark plug, the
ignition coil, the connector, and the
harness of the defective cylinder.
(When more than one cylinder are
detected, inspect all of them.)
When all the cylinders are OK, go to
(2).
change.
(2)
(1)
Check the following connectors:
The ignition coil connectors for a
defective cylinder (B-01, B-11).
OK
Check the spark plug and the
ignition coil for a defective cylinder.
(Refer to GROUP 16 - Ignition
System.)
OK
Check the following connector:
C-34 <M/T>, C-177 <A/T>
OK
Check the harness wire between the
engine-ECU <M/T> or
engine-A/T-ECU <A/T> and the
ignition coil connector for defective
cylinder.
OK
Use an analyzer to measure the signal waveform at engine-ECU connector C-34 <M/T>
or engine-A/T-ECU connector C-177 <A/T>.
Engine: Idling
D
The voltage between the ignition coil primary signal terminal for a defective cylinder
D
and earth
OK:
A normal waveform should be displayed as described on P.13A-88* (Inspection
Procedure Using an Analyzer).
OK
Repair the ignition coil assembly for
a defective cylinder and the spark
plug.
NG
NG
NG
NG
Repair
Replace
Repair
Repair
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Use an analyzer to measure the
signal waveform at the ignition failure
sensor connector B-105.
Use test harness (MB991536) to
D
connect the connector, and
measure at the pick-up harness.
Engine: Idling
D
The voltage between terminal 2
D
and earth
OK:
A normal waveform should
be displayed as described
on P.13A-88* (INSPECTION
PROCEDURE USING AN
Reference
When a normal waveform is
displayed, compare it with that of the
ignition coil primary signal at the
engine-ECU terminal <M/T> or
engine-A/T-ECU <A/T> to determine
the cylinder (defective cylinder) with
an abnormal waveform.
®
abnormal, go to (1)
®
abnormal, go to (3)
®
displayed, go to (4).
ANALYZER).
When one or more cylinders are
When all of the cylinders are
When a normal waveform is
(1)
(3)
(4)
Check the following connectors:
C-38 <M/T>, C-176 <A/T>, B-105
OK
Check the harness wires between
the ignition failure sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and between
the ignition failure sensor and earth.
OK
Repair the ignition failure sensor.
Check the trouble symptoms.
Check the trouble symptoms.
NG
Check the spark plug and the
ignition coil for a defective cylinder.
(Refer to GROUP 16 - Ignition
System.)
NG
NG
NG
OK
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Intermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Loading...