Engine Coolant Temperature Sensor -G62- / Engine Temperature Sensor - G407-, CHECKING

General Description

NOTE:

The CMC uses a G62 (Engine Coolant Temperature Sensor), while the CA2 uses a G407 (Engine Temperature Sensor). For the duration of this ppt test, please refer to the naming convention of G62 (Engine Coolant Temperature Sensor).

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 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

NOTE:

For simplicity, please refer to the ECM connectors without a suffix.

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- / Engine Temperature Sensor - G407-, 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. IGNITION: OFF. SPECIFIED VALUE: 2, 250 Ω (+/- 750 @ approx. 20° C). -- Was Value obtained?	-- YES: GO TO: Step 3 Engine Coolant Temperature Sensor -G62- / Engine Temperature Sensor - G407-, CHECKING - 3 . -- NO: REPLACE: Engine Coolant Temperature Sensor -G62-. Refer to appropriate repair information. GO TO: Step 4 Engine Coolant Temperature Sensor -G62- / Engine Temperature Sensor - G407-, 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 / 58 for resistance. CHECK: Engine Coolant Temperature Sensor -G62- harness connector terminal 2 to the Engine Control Module - J623- harness connector T105 / 55 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- / Engine Temperature Sensor - G407-, 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- / Engine Temperature Sensor - G407-, CHECKING - 4 .
4	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine Control Module -J623-. Refer to appropriate repair information. Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY . Repair is complete. Generate Readiness Code. Refer to READINESS CODE . Return vehicle to Customer. -- NO: Perform the diagnostic procedure for any DTC's. If no DTC's return, the repair is complete. Return vehicle to customer.