Camshaft Position Sensor G40, Checking

camshaft Position Sensor G40, Checking

The following procedure is used to diagnose both Camshaft Position (CMP) Sensor G40 and Camshaft Position (CMP) Sensor 2 G163

NOTE: Use only gold-plated terminals when servicing terminals in harness connectors of Camshaft Position (CMP) Sensor G40 and Camshaft Position (CMP) Sensor 2 G163.

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements







- The Motronic 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. Preliminary Check

Start diagnosis







- Disconnect the Camshaft Position (CMP) Sensor G40 electrical harness connector - 1 - or Camshaft Position (CMP) Sensor 2 G163.
- Switch the ignition on.







- Using a Multimeter, Check the Camshaft Position (CMP) Sensor G40 or Camshaft Position (CMP) Sensor 2 G163 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 Motronic Engine Control Module (ECM) J623.







- Using a Multimeter, Check the Camshaft Position (CMP) Sensor G40 or Camshaft Position (CMP) Sensor 2 G163 electrical harness connector to the Motronic Engine Control Module (ECM) electrical harness connector T60 for an open circuit.

Camshaft Position(CMP) Sensor Motronic Engine Control Module
2 G163 electrical harness (ECM) electrical harness connector
connector terminals T terminals or test box sockets
1 T-60 37
2 T-60 59
3 T-60 14

Camshaft Position (CMP) Motronic Engine Control Module
Sensor G40 electrical harness (ECM) electrical harness connector
Connector terminals T terminals or test box sockets
1 T-60 26
2 T-60 44
3 T-60 14

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, loose 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 or Camshaft Position (CMP) Sensor 2 G163 Engine Mechanical, Fuel Injection Ignition,.
- Erase the DTC memory. Diagnostic Modes 01 - 09
- Perform a road test to verify repair.

If the DTC does not return:
Repair complete, Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Motronic Engine Control Module (ECM) J623.
- Assembly is performed in the reverse of the removal.

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

1. Check the DTC memory. Diagnostic Modes 01 - 09
2. If necessary, erase the DTC memory. Diagnostic Modes 01 - 09
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

End of Diagnosis