Camshaft Position Sensor: Testing and Inspection

Camshaft Position Sensors, Checking

This procedure is used to check Camshaft Position (CMP) Sensors (G40, G300, G163, G301).

• The following procedure is used to diagnose all Camshaft Position (CMP) Sensors.

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Engine Control Module (ECM) ( J623) fuses OK.

• Battery voltage at least 12.5 volts.

• All electrical consumers such as, lights and rear window defroster, switched off.

• Vehicles with automatic transmission, shift selector lever into position " P" or "N".

• A/C switched off.

• Ground (GND) connections between engine/transmission/chassis OK.

• Ignition switched off.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] General Diagnosis.

Start diagnosis

Checking activation

- Remove the front engine cover - arrows -.





- Remove the rear engine cover - arrows -.





- Disconnect the electrical harness connector of the Camshaft Position (CMP) Sensor (G40) to be tested.

- Switch the ignition on.

- Using a Multimeter, Check the Camshaft Position (CMP) Sensor electrical harness connector terminals 1 to 3 for voltage.





Specified value: about 5.0 V

- Switch the ignition off.

If the specification was not obtained:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

- Install the test box. Refer to Fuel Injection and Ignition Repair Information.

If the manufacturers test box is not being used. Perform the following step.

- Remove the Engine Control Module (ECM) (J623 ). Refer to => [ ECM, Removing and Installing ] ECM, Removing and Installing.

- Using a Multimeter, Check the Camshaft Position (CMP) Sensor electrical harness connector to the Engine Control Module (ECM) (J623) electrical harness connector T60 for an open circuit.





















Specified value: 1.5 ohms Max.

If the specified value was not obtained:

- Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).

- Check the wiring connection for damage, corrosion, lose or broken terminals.

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:

- Replace the Camshaft Position (CMP) Sensor (G40 ) Refer to Fuel Injection and Ignition Repair Information.

If no malfunction is found in the wiring and voltage supply was not OK:

- Replace the Engine Control Module (ECM) (J623 ). Refer to => [ ECM, Removing and Installing ] ECM, Removing and Installing.

Assembly is performed in the reverse order of removal, note the following:

Final procedures

After repair work, the following work steps must be performed in the mentioned sequence:

1. Check the DTC memory. => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase the DTC memory. => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End diagnosis and switch ignition off.