Engine Coolant Temperature Sensor -G62-, Checking

Function

The Engine Coolant Temperature Sensor -G62- sends information about the current coolant temperature to the Engine 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 Auto. Transmission, ensure Selector Lever position is in "P".
Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
Observe all safety precautions: SAFETY PRECAUTIONS .
View clean working conditions: CLEAN WORKING CONDITIONS .
For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .

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. -- 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: 2380 Ω (+/- 500 Ω @ approx. 20° C). IGNITION: OFF. -- Was Value obtained?	-- YES: GO TO Step 3. -- NO: REPLACE: Engine Coolant Temperature Sensor -G62-. Refer to appropriate Service Information. GO TO: Step 4.
3	REMOVE: Engine Control Module - J623-. Refer to appropriate Service Information. CHECK: Engine Coolant Temperature Sensor -G62- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / 14 for resistance. CHECK: Engine Coolant Temperature Sensor -G62- harness connector terminal 2 to the Engine Control Module - J623- harness connector T60 / 10 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Engine Control Module -J623-. Refer to appropriate Service Information. GO TO: Step 4. -- NO: 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.
4	Final Procedure Perform a road test to verify repair. Do any DTC's return:	-- YES: Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY . Perform the diagnostic procedure for that DTC. -- NO: Repair is complete. Generate readiness code. Refer to READINESS CODE . Return vehicle to Customer.