Engine Coolant Temperature Sensor - G62-, Checking: Notes

General Description

The Engine Coolant Temperature Sensor -G62- sends information about the current coolant temperature to the Engine/Motor Control Module -J623-. It uses the coolant temperature as a correction value for calculating the injection quantity.

Special Tools And Workshop Equipment Required

Multimeter.
Wiring Diagram.
Scan Tool.

Test Requirements

Fuses OK.
Battery voltage OK.
Switch OFF all electrical and electronic accessories.
Vehicles with automatic transmission, ensure the selector lever position is in "P".
Vehicles with manual transmission, ensure the shifter lever position is in "N" with the parking brake applied.
Observe all safety precautions: SAFETY PRECAUTIONS .
View clean working conditions: CLEAN WORKING CONDITIONS .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2 Engine Coolant Temperature Sensor - G62-, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Engine Coolant Temperature Sensor -G62- harness connector. CHECK: Engine Coolant Temperature Sensor -G62- component connector terminals 1 to 2 for resistance. SPECIFIED VALUE: 2, 250 Ω (+/- 750 Ω @ approx. 20° C). -- Was Value obtained?	-- YES: GO TO: Step 3 Engine Coolant Temperature Sensor - G62-, CHECKING - 3 . -- NO: REPLACE: Engine Coolant Temperature Sensor -G62-. Refer to appropriate service information. GO TO: Step 4 Engine Coolant Temperature Sensor - G62-, CHECKING - 4 .
3	REMOVE: Engine/Motor Control Module -J623-. Refer to appropriate service information. CHECK: Engine Coolant Temperature Sensor -G62- harness connector terminal 1 to the Engine/Motor Control Module -J623- harness connector T60 / 14 for resistance. CHECK: Engine Coolant Temperature Sensor -G62- harness connector terminal 2 to the Engine/Motor Control Module -J623- harness connector T60 / 10 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: TIP: The Engine Coolant Temperature Sensor -G62- may fail under loaded operation; please swap a known good Engine Coolant Temperature Sensor -G62- prior to continuing to the next step. GO TO: Step 4 Engine Coolant Temperature Sensor - G62-, CHECKING - 4 . -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 4 Engine Coolant Temperature Sensor - G62-, CHECKING - 4 .
4	Refer to the Final Procedure Below