Camshaft Position Sensor: Testing and Inspection

Camshaft Position (CMP) Sensors, Checking

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

NOTE: 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.

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.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Engine Control Module (ECM) J623.







- 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.

Camshaft Position (CMP) Engine Control Module
Sensor G40 electrical harness (ECM) J623 electrical harness
connector terminals connector T60 terminals or test box sockets
1 Battery positive (+) 11
2 (signal) 25
3 Ground (GND) 40

Camshaft Position (CMP) Engine Control Module
Sensor 3 G300 electrical (ECM) J623 electrical harness
harness connector terminals connector T60 terminals or test box sockets
1 Battery positive (+) 11
2 (signal) 54
3 Ground (GND) 40

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.

If no malfunction is found in the wiring and voltage supply was not OK:
- Replace the Engine Control Module (ECM) J623.

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.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.