Toyota Tercel 1994 User Manual

toyota :: Toyota Tercel Sedan 4-Door L4-1456cc

1.5L SOHC (3E) (1994)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Testing and Inspection

Electronic Brake Control Module: Testing and Inspection

ECU TERMINAL VALUES MEASUREMENT USING TOYOTA BREAK-OUT-BOX AND TOYOTA HAND-HELD TESTER

1. Hook up the TOYOTA hand-held tester and TOYOTA break-out-box to the vehicle.

2. Read the ECU input/output values by following the prompts on the tester screen.

Hint:

TOYOTA hand-held tester has a "Snapshot" function. This records the measured values and is effective in the diagnosis of intermittentproblems. Please refer to the TOYOTA hand-held tester/ TOYOTA break-out-box operator's manual for further details.

> Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Testing and Inspection > A/C Amplifier With P/S

Control Module HVAC: Testing and InspectionA/C Amplifier With P/S

ON-VEHICLE INSPECTION

INSPECT A/C AMPLIFIER CIRCUIT

Terminal Identification

Reference

a. Disconnect the connector from the amplifier and inspect connector on wire harness side. as shown in the chart.

ON

Test conditions:^ Ignition switch ^ Blower switch HI

Terminal Identification

> Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Testing and Inspection > A/C Amplifier With P/S > Page 12

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

If circuit is as specified, try replacing the amplifier with a new one. If the circuit is not as specified, inspect the circuits connected to otherparts.

Reference

b. Connect the connector to A/C amplifier and inspect wire harness side connector from the back side, as shown in the chart.

ON

Test conditions:^ Ignition switch ^ Temperature control lever MAX COOL

^ Blower switch HI^ A/C switch ^ Install manifold gauge setON

If circuit is as specified, try replacing the amplifier with a new one. If the circuit is not as specified, inspect the circuits connected to otherparts.

> Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Testing and Inspection > A/C Amplifier With P/S > Page 13

Control Module HVAC: Testing and InspectionA/C Amplifier Without P/S

ON -VEHICLE INSPECTION

INSPECT A/C AMPLIFIER CIRCUIT

Terminal Identification

Reference

a. Disconnect the connector from the amplifier and inspect connector on wire harness side, as shown in the chart.

ON

Test conditions:^ Ignition switch ^ Blower switch HI

If circuit is as specified, try replacing the amplifier with a new one. If the circuit is not as specified, inspect the circuits connected to otherparts.

Terminal Identification

> Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Testing and Inspection > A/C Amplifier With P/S > Page 14

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

Reference

b. Connect the connector to A/C amplifier and inspect wire harness side connector from the back side, as shown in the chart.

ON

Test conditions:^ Ignition switch ^ Temperature control lever MAX COOL^ Blower switch HI

^ A/C switch ^ Install manifold gauge setON

If circuit is as specified. try replacing the amplifier with a new one. If the circuit is not as specified, inspect the circuits connected to otherparts.

> Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Testing and Inspection > Page 15

Control Module HVAC: Service and Repair
AMPLIFIER REMOVAL

REMOVE A/C AMPLIFIER

a. Remove glove compartment parts.b. Disconnect the connector from the amplifier.c. Remove the 2 screws and the amplifier.

AMPLIFIER INSTALLATION

Installation is in the reverse order of removal.

> Relays and Modules > Relays and Modules - Lighting and Horns > Horn Relay > Component Information > Locations

Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment

Engine Compartment Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 25

Instrument Panel Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 26

Relay Box: LocationsRelay Block No. 2

Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 27

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 28

Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 29

Relay Box: Locations

Engine Compartment Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 30

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

Instrument Panel Relay Locations

Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 31

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

Relay Locations

Relay Locations

> Relays and Modules > Relays and Modules - Power and Ground Distribution > Relay Box > Component Information > Locations > Engine Compartment > Page 32

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

Relay Locations

Relay Locations

Relay Locations

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Specifications > ECM Terminal Voltage

Values

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Specifications > ECM Terminal Voltage

Values > Page 39

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Specifications > Page 40

Engine Control Module: Locations

Behind Center Console

Located behind the center console, underneath of the dashboard.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Specifications > Page 41

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Specifications > Page 42

Engine Control Module: Description and Operation
The ECM controls the following functions:

1. Multiport Fuel Injection (MFI)

The ECM receives signals from various sensors indicating changing engine operating conditions such as:

Intake manifold absolute pressure
Intake air temperature
Engine coolant temperature
Engine rpm
Throttle valve opening angle
Exhaust oxygen content, etc.

These signals are utilized by the Electronic Control Module () to determine the injection duration necessary for an optimum air-fuel ratio.ECM

2. Electronic Spark Advance (ESA)

The ECM is programmed with data for optimum ignition timing under all operating conditions. Using data provided by sensors which monitorvarious engine functions (rpm, engine coolant temperature, etc.) the microcomputer (ECM) triggers the spark at precisely the right instant.

3. Idle-Up Control

The ECM determines the appropriate idle speed according to engine condition and provides the electric signal to the Vacuum Switching Valve () which controls the bypass air.VSV

4. Exhaust Gas Recirculation (EGR)

The ECM controls the EGR system according to coolant temperature, engine rpm and intake manifold absolute pressure. The electric signal fromthe ECM is transmitted to the VSV which controls the EGR valve.

5. Diagnosis

6. Fail-Safe Function

In the event of a sensor malfunction, a back-up circuit will take over to provide minimal driveability, and the malfunction indicator lamp will lightup.

The ECM detects any malfunctions or abnormalities in the sensor network and lights a malfunction indicator lamp on the instrument panel. At thesame time, the trouble is identified and a diagnostic code is recorded by the ECM. The diagnostic trouble code can be read by the number of blinksof the malfunction indicator lamp when terminals TE1 and E1 are connected. For the diagnostic trouble codes.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Testing and Inspection > Troubleshooting

W/ Volt, Ohmmeter

Engine Control Module: Testing and InspectionTroubleshooting W/ Volt, Ohmmeter

HINT

: The following troubleshooting procedures are designed for inspection of each separate system, therefore the procedure may varysomewhat. However. troubleshooting should be performed referring to the inspection methods described in this manual.

Before beginning inspection, it is best to first make a simple check of the fuses. fusible links and condition of the connectors.

The following troubleshooting procedures are based on the supposition that the trouble lies in either a short or open circuit in a component outsidethe computer or a short circuit within the computer.

If engine trouble occurs even though proper operating voltage is detected in the computer connector, then it can be assumed that the ElectronicControl Module () is faulty and should be replaced.ECM

PREPARATION

a. Disconnect the connectors from the ECM.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component

Information > Testing and Inspection > Troubleshooting W/ Volt, Ohmmeter > Page 45

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

b. Remove the locks as shown in the illustration so that the tester probe(s) can easily come in.

NOTICE: Pay attention to sections A and B in the illustration which can be easily broken.

c. Reconnect the connectors to the ECM.

HINT:
^ Perform all voltage measurements with the connectors connected.
^ Verify that the battery voltage is 11 V or above when the ignition switch is ON.

ECM INSPECTION

Use a voltmeter with high impedance (10 kohms/V minimum) when measuring voltage at ECM terminals.Note:

1. Inspect Voltage Of ECM, See: ECM Terminal Voltage Values

Check the voltage between each terminal of the wiring connectors.
^ Turn the ignition switch ON.
^ Measure the voltage at each terminal.

NOTE:

^ Perform all voltage measurements with the connectors connected.
^ Verify that the battery voltage is 11 V or more when the ignition switch is ON.

2. Inspect Resistance Of ECM, See: ECM Terminal Resistance Values

NOTE:

^ Do no touch the ECM terminals.
^ The tester probe should be inserted in the wiring connector from the wiring side.

Check the resistance between each of the terminals of the wiring connector.
^ Disconnect the connectors from the ECM.
^ Measure the resistance at each terminal.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Testing and Inspection > Troubleshooting

W/ Volt, Ohmmeter > Page 46

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Testing and Inspection > Troubleshooting

W/ Volt, Ohmmeter > Page 47

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Testing and Inspection > Troubleshooting

W/ Volt, Ohmmeter > Page 48

Engine Control Module: Testing and InspectionFuel Cut RPM Test

FUEL CUT RPM INSPECTION

1. Warm Up Engine
Allow the engine to warm up to normal operating temperature.

2. Connect Tachometer
Connect the test probe of a tachometer to terminal 1G of the data link connector 1.

NOTE

^ Never allow the tachometer terminal to touch ground as It could result in damage to the igniter and/or ignition coil.
^ As some tachometers are not compatible with this ignition system. we recommend that you confirm the compatibility of yours before use.

3. Inspect Fuel Cut Operation
a. Increase the engine speed to at least 2,500 rpm.
b. Check for injector operating sound.
c. Check that when the throttle lever is released, injector operation sound stops momentarily and then resumes.

NOTE

^ The vehicle should be stopped.
^ Accessories switched OFF.

Fuel return rpm: 1,300 rpm

4. Remove Tachometer

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Testing and Inspection > Page 49

Engine Control Module: Service and Repair

ECM Removal

Refer to illustration for ECM removal.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > EFI Main Relay <--> [Main Relay (Computer/Fuel System)] > Component Information >

Locations

EFI Main Relay: Locations

Location Of Fuses And Fusible Link

Located on the LH side of engine compartment.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > EFI Main Relay <--> [Main Relay (Computer/Fuel System)] > Component Information >

Locations > Page 53

EFI Main Relay: Description and Operation

EFI Main Relay Circuit Schematic

PURPOSE

The main relay provides power to the Electronic Control Module (). ECM

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > EFI Main Relay <--> [Main Relay (Computer/Fuel System)] > Component Information >

Locations > Page 54

EFI Main Relay: Testing and Inspection

1. Remove Electronic Fuel Injection () Main RelayEFI

2. Inspect EFI Main Relay
A. Inspect relay continuity

a. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
b. Check that there is no continuity between terminals 3 and 5.
If continuity is not as specified, replace the relay.

B. Inspect relay operation

a. Apply battery voltage across terminals 1 and 2.
b. Using an ohmmeter. check that there is continuity between terminals 3 and 5.

If operation is not as specified. replace the relay.

3. Reinstall EFI Main Relay

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Circuit Opening Relay <--> [Fuel Pump Relay] > Component Information > Locations

Circuit Opening Relay: Locations

ECU And Circuit Opening Relay Location

The Circuit Opening Relay is located behind the center dash console, near the Electronic Control Module ().ECM

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Circuit Opening Relay <--> [Fuel Pump Relay] > Component Information > Locations > Page

59

Circuit Opening Relay: Description and Operation

Circuit Opening Relay Schematic

PURPOSE

The circuit opening relay provides power to the fuel pump.

OPERATION

ECM

One coil is energized when the key is turned to the start position. The relay contacts close and power is supplied to the fuel pump for starting.Once the Electronic Control Module () begins to receive pulses from the engine rpm sensor it grounds the other coil which continues to holdthe contacts closed after the key is released to the run position.

CONSTRUCTION

The relay consists of a single set of contacts controlled by two separate coils.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Circuit Opening Relay <--> [Fuel Pump Relay] > Component Information > Locations > Page

60

Circuit Opening Relay: Testing and Inspection

1. Remove Circuit Opening Relay

2. Inspect Circuit Opening Relay
A. Inspect relay continuity

a. Using and ohmmeter, check that there is continuity between terminals STA and E1.
b. Check that there is continuity between terminals +B and FC.
c. Check that there is no continuity between terminals +B and FP.

If continuity is not as specified, replace the relay.

B. Inspect relay operation

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Circuit Opening Relay <--> [Fuel Pump

Relay] > Component Information > Locations > Page 61

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

a. Apply battery voltage across terminals STA and E1.
b. Using an ohmmeter, check that there is continuity between terminals +B and FP.

c. Apply battery voltage across terminals +B and FC.
d. Check that there is continuity between terminals +B and FP.
If operation is not as specified, replace the relay.

3. Reinstall Circuit Opening Relay

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Circuit Opening Relay <--> [Fuel Pump Relay] > Component Information > Locations > Page

62

Circuit Opening Relay: Service and Repair

Accessing The Circuit Opening Relay

Refer to illustration for circuit opening relay removal.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > EFI Main Relay <--> [Main Relay (Computer/Fuel System)] > Component Information >

Locations

EFI Main Relay: Locations

Location Of Fuses And Fusible Link

Located on the LH side of engine compartment.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > EFI Main Relay <--> [Main Relay (Computer/Fuel System)] > Component Information >

Locations > Page 66

EFI Main Relay: Description and Operation

EFI Main Relay Circuit Schematic

PURPOSE

The main relay provides power to the Electronic Control Module (). ECM

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > EFI Main Relay <--> [Main Relay (Computer/Fuel System)] > Component Information >

Locations > Page 67

EFI Main Relay: Testing and Inspection

1. Remove Electronic Fuel Injection () Main RelayEFI

2. Inspect EFI Main Relay
A. Inspect relay continuity

a. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
b. Check that there is no continuity between terminals 3 and 5.
If continuity is not as specified, replace the relay.

B. Inspect relay operation

a. Apply battery voltage across terminals 1 and 2.
b. Using an ohmmeter. check that there is continuity between terminals 3 and 5.

If operation is not as specified. replace the relay.

3. Reinstall EFI Main Relay

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Ignition System > Igniter <--> [Ignition Control Module] > Component Information > Locations

Igniter: Locations

Located near firewall, center of engine compartment.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Ignition System > Igniter <--> [Ignition Control Module] > Component Information > Locations > Page 72

Igniter: Description and Operation

PURPOSE

ECU

The igniter physically fires the ignition coil in response to the Electronic Control Unit ()'s signal. Computers generally produce low amperagesignals as outputs, the igniter is essentially an electronic relay. It receives a "trigger" from the ECU and responds by turning a higher amperagecurrent to the ignition coil on and off.

OPERATION

Computers generally produce low amperage signals as outputs, the igniter is essentially an electronic relay. It receives a "trigger" from the ECUand responds by turning a higher amperage current to the ignition coil on and off.

CONSTRUCTION

The igniter consists of a power transistor and circuitry to provide a tachometer output.

> Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Ignition System > Igniter <--> [Ignition Control Module] > Component Information > Locations > Page 73

Igniter: Testing and Inspection

Spark Test

a. Disconnect the high-tension cords from the spark plugs.
b. Remove the spark plugs.
c. Install the spark plugs to each high-tension cord.
d. Ground the spark plug.
e. Check if spark occurs while engine is being cranked.

HINT: To prevent gasoline from being injected from injectors during this test. crank the engine for no more than 1 - 2 seconds at a time.

If Spark Does Not Occur, Perform The Following Test:

> Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Service and Repair

Air Bag Control Module: Service and Repair

CENTER AIRBAG SENSOR ASSEMBLY REMOVAL AND INSTALLATION

CAUTION:

Work must be started after 90 seconds from the time the ignition switch is turned to the LOCK position and the negative (-) terminalcable is disconnected from the battery.

-NOTICE:

Do not open the cover or the case of the ECU and various computers unless absolutely necessary. (If the IC terminals are touched, the IC may bedestroyed by static electricity.)

- Never use SRS parts from another vehicle. When replacing parts, replace with new parts.

- Never reuse the center airbag sensor assembly involved in a collision when the airbag has deployed.

- Never repair a sensor in order to reuse it.

> Relays and Modules > Relays and Modules - Restraint Systems > Air Bag Control Module > Component Information > Service and Repair > Page 78

Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)

1. Disconnect and connect the connector.

Removal and installation of the connector is done with the sensor assembly installed.NOTICE:

2. Using a torx wrench, loosen and tighten the 4 screws.

Torx wrench: T40 (Part No.09042-00020 or locally manufactured tool)
Torque: 13 N.m (130 kgf.cm, 9 ft.lbf)

-NOTICE:

Make sure the sensor assembly is installed to the specified torque.

­If the sensor assembly has been dropped, or there are cracks, dents or other defects in the case, bracket or connector, replace the sensor assemblywith a new one.

- When installing the sensor assembly, take care that the airbag wiring does not interfere with other parts and is not pinched between other parts.

- After installation, shake the sensor assembly to check that there is no looseness.

> Relays and Modules > Relays and Modules - Restraint Systems > Seat Occupant Classification Module - Air Bag > Component Information > Technical Service Bulletins > Restraints - OCS System Initialization

Seat Occupant Classification Module - Air Bag: Technical Service BulletinsRestraints - OCS System Initialization

COLLISION REPAIR INFORMATIONFOR THE COLLISION REPAIR PROFESSIONAL
TITLE: SRS OCCUPANT CLASSIFICATION SYSTEM INITIALIZATION
SECTION: ELECTRICAL BULLETIN # 177
MODELS: ALL EQUIPPED TOYOTA LEXUS and SCION MODELS
DATE: MARCH 2010

Models equipped with a Supplemental Restraint System (SRS) Occupant Classification System (OCS) will enable or disable the passenger front and sideairbags based on seat occupancy passenger weight and seat belt latch engagement.

If an equipped vehicle sustains collision damage or if the front passenger seat or any of the OCS components are serviced the SRS Malfunction IndicatorLight (MIL) may illuminate setting a Diagnostic Trouble Code (DTC).

:NOTE

It is necessary to diagnose and repair the root cause of a SRS or OCS DTC before initializing the OCS system. If SRS and OCS DTC's are notcleared the system may not operate properly.

Be sure to check and clear DTC's and perform OCS initialization per repair manual instructions with a Techstream Special Service Tool (SST) orcapable diagnostic tester.

Any of the following conditions could set a DTC illuminate the SRS MIL or cause the PASSENGER AIRBAG light to indicate incorrectly regardless ofoccupancy:
^ The OCS Electronic Control Unit (ECU) is replaced
^ Accessories such as a seatback tray are installed on the passenger seat
^ The passenger seat is removed and replaced or reinstalled
^ The vehicle is involved in an accident or collision
Model-specific repair manuals can be accessed through the Technical Information System (TIS) www.techinfo.toyota.com

> Relays and Modules > Relays and Modules - Starting and Charging > Starter Relay > Component Information > Testing and Inspection

Starter Relay: Testing and Inspection

Fig. 11 Starter Relay Inspection.

1.

Fig. 11.

Using a suitable ohmmeter, check relay continuity as follows:a. Ensure continuity exists between terminals 85 and 86, b. Ensure continuity exists between terminals 30 and 87.c. Apply battery voltage across terminals 85 and 86.d. Ensure continuity does not exist between terminals 30 and 87.e. If continuity is not as specified, replace relay.

> Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Shift Interlock Control Module > Component Information > Testing and Inspection

Shift Interlock Control Module: Testing and Inspection

Fig. 3 Shift Lock ECM Connector Terminals.

Fig. 4 Shift Lock Control ECM Inspection.

Fig. 3. Fig. 4

Using a suitable voltmeter, measure voltage at each terminal of the shift lock ECM connector, Refer to for measuring conditions andvoltage specifications.

> Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Specifications

Coolant Temperature Sensor/Switch (For Computer): Specifications
Resistance

-4 F (-20 C) ..................................................................................................................................................................................... 10 - 20 K ohms32 F (0 C) ........................................................................................................................................................................................... 4 - 7 K ohms68 F (20 C) ......................................................................................................................................................................................... 2 - 3 K ohms

104 F (40 C) ................................................................................................................................................................................... 0.9 - 1.3 K ohms140 F (60 C) ................................................................................................................................................................................... 0.4 - 0.7 K ohms176 F (80 C) ................................................................................................................................................................................... 0.2 - 0.4 K ohms

> Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Specifications > Page 98

Coolant Temperature Sensor/Switch (For Computer): Locations

CEC Component Locations

The water temperature sensor is located in the engine compartment on the left, rear side of the engine.

> Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Specifications > Page 99

Coolant Temperature Sensor/Switch (For Computer): Description and Operation

Engine Coolant Temperature (ECT ) Sensor

PURPOSE

ECT ECM

The engine coolant temperature () sensor measures engine temperature by sensing water temperature. The Electronic Control Module ()uses this information for determining the proper air/fuel mixture for all conditions.

> Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Specifications > Page 100

Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

ECT SENSOR INSPECTION

1. Drain Engine Coolant

2. Remove Engine Cooland Temperature () SensorECT

3. Inspect ECT Sensor

Using an ohmmeter, measure the resistance between the terminals.