Camshaft Position Sensor, Checking

Camshaft Position Sensors, 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.

Procedure
- Remove the engine cover with air filter.







- 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 T121 for an open circuit.

Camshaft Position (CMP) Motronic Engine Control Module
Sensor 2 G163 electrical (ECM) electrical harness connector T121
harness connector terminals terminals or test box sockets
1 T121 98
2 T121 86
3 T-121 108

Camshaft Position (CMP) Motronic Engine Control Module
Sensor G40 electrical (ECM) electrical harness connector T121
harness connector terminals terminals or test box sockets
1 T121 98
2 T121 87
3 T121 108

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 or Camshaft Position (CMP) Sensor 2 G163.

If no malfunction is found in the wiring and voltage supply was not OK:
- Replace the Motronic Engine Control Module (ECM) J623.
- Install the engine cover with air filter

Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

End of diagnosis.