Fuel Temperature Sensor -G81-, CHECKING

Observe all safety precautions: SAFETY PRECAUTIONS 

View clean working conditions: CLEAN WORKING CONDITIONS 

Prior to repair work, perform a preliminary check to verify the condition. Refer to 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 and workshop equipment 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 

-- Remove the engine cover

-- Disconnect the Fuel Temperature Sensor -G81- electrical harness connector. -2-

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:

Fuel temperature	Sensor resistance
20° C (68° F)	2000 to 2400 Ω

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 specified value 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 -J623-. Refer to the service information for removal and installation procedures.

Fuel Temperature Sensor -G81- electrical harness connector terminal	Engine Control Module -J623- electrical harness connector T105 terminals
1	94
2	73

-- Using a multimeter, measure the resistance of circuits between the Fuel Temperature Sensor -G81- and the Engine Control Module -J623- electrical harness connectors. Refer to the applicable wiring diagram.

Specified value: 1.5 Ω Max.

If the specified value 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 -J623-. Refer to the service information for removal and installation 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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .