Camshaft Position Sensor -G40-, CHECKING

Function

Using the signal from the Camshaft Position Sensor -G40-, the precise position of the camshaft relative to the crankshaft is determined very quickly when the engine is started. Used in combination with the signal from the Engine Speed Sensor -G28-, the signal from the Camshaft Position Sensor -G40- allows to detect which cylinder is at TDC. The fuel can be injected into the corresponding cylinder and ignited.

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.
Coolant Temperature: ≥ 80° C.
Observe all safety precautions. Refer to: SAFETY PRECAUTIONS .
View clean working conditions. Refer to: 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 Camshaft Position Sensor -G40-, CHECKING . -- NO: GATHER more information from customer about the complaint.
2	DISCONNECT: Camshaft Position Sensor -G40- harness connector. IGNITION: ON. CHECK: Camshaft Position Sensor -G40- harness connector terminals 1 to 3 for voltage. SPECIFIED VALUE: About 5.0 V. IGNITION: OFF. -- Was Value obtained?	-- YES: GO TO Step 3 Camshaft Position Sensor -G40-, CHECKING . -- NO: GO TO Step 4 Camshaft Position Sensor -G40-, CHECKING .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate repair service information. CHECK: Camshaft Position Sensor -G40- harness connector terminal 2 to the Engine Control Module - J623- harness connector T60 / 44 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Camshaft Position Sensor -G40-. Refer to appropriate repair service information. GO TO: Step 5 Camshaft Position Sensor -G40-, CHECKING . -- 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 5 Camshaft Position Sensor -G40-, CHECKING .
4	REMOVE: Engine Control Module - J623-. Refer to appropriate repair service information. CHECK: Camshaft Position Sensor -G40- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / 26 for resistance. CHECK: Camshaft Position Sensor -G40- harness connector terminal 3 to the Engine Control Module - J623- harness connector T60 / 52 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Engine Control Module -J623-. Refer to appropriate repair service information. GO TO: Step 5 Camshaft Position Sensor -G40-, CHECKING . -- 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 5 Camshaft Position Sensor -G40-, CHECKING .
5	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.