Fuel Temperature Sensor, Checking

Fuel Temperature Sensor, Checking

Observe all safety precautions: => [ Safety Precautions ] Safety Precautions

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Prior to repair work, perform a preliminary check to verify the condition. Refer to => [ Preliminary Check ] Preliminary Check.

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram

Test requirements

• The engine control module fuses OK

• Battery voltage at least 12.5 volts

• All electrical consumers switched off

• Vehicles with automatic transmission, shift selector lever in park or neutral

• A/C switched off

• Ground connections between engine/transmission/chassis OK

Test procedure

- Disconnect the Fuel Temperature Sensor (G81) electrical harness connector.

Checking internal resistance

- Using a multimeter, measure the resistance between the terminals of the Fuel Temperature Sensor (G81).

Use the chart below to estimate the specified values:






If the sensor value was not within the specified range:

- Replace the Fuel Temperature Sensor (G81).

Checking the voltage

- Disconnect the Fuel Temperature Sensor (G81) connector.

- Turn the ignition switch ON.

- Using a multimeter, measure the voltage between the Fuel Temperature Sensor (G81) terminal 2 and ground.

Specified value: near 5.0 V

If the specification was obtained:

- Using a multimeter, measure the voltage between the Fuel Temperature Sensor (G81) terminals 2 and 1.

Specified value: near 5.0 V

If the voltages above were Not obtained:

Checking the wiring

- Remove the Engine Control Module (ECM) (J623). Refer to the service information for procedures.






- Using a multimeter, measure the resistance of circuits between the Fuel Temperature Sensor (G81) and the Engine Control Module (ECM) (J623) electrical harness connectors.

Specified value: 1.5 ohms Max.

If the specification was not obtained:

- Check the wires for high resistance, a short circuit to each other, a short to battery voltage, and a short to ground.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- Repair as necessary.

If no malfunction is detected in the sensor or wiring:

- Replace the Engine Control Module (ECM) (J623). Refer to the service information for procedures.

Final procedures

After repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 0A.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 0A.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Readiness Code.