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 Manual Transmission, ensure Gear Shift Lever position is in "N" with Parking Brake applied.
Coolant Temperature: ≥ 80° C.
Observe all safety precautions: .
View clean working conditions: .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to . -- 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). IGNITION: OFF. -- 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 repair information. GO TO: Step 4 Engine Coolant Temperature Sensor - G62-, CHECKING => 4 .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate repair information. CHECK: Engine Coolant Temperature Sensor -G62- harness connector terminal 1 to the Engine Control Module - J623- harness connector T105 / 47 for resistance. CHECK: Engine Coolant Temperature Sensor -G62- harness connector terminal 2 to the Engine Control Module - J623- harness connector T105 / 40 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Engine Control Module -J623-. Refer to appropriate repair information. GO TO: Step 4 Engine Coolant Temperature Sensor - G62-, CHECKING => 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 Engine Coolant Temperature Sensor - G62-, CHECKING => 4 .
4	Final Procedure Perform a road test to verify repair. Do any DTC's return:	-- YES: Check the DTC memory. Refer to . Perform the diagnostic procedure for that DTC. -- NO: Repair is complete. Generate readiness code. Refer to . Return vehicle to Customer.