P0341

P0341
Camshaft Position (CMP) Sensor signal implausible

Function
The CMP Sensor signal identifies the first cylinder. If both the Crankshaft Position (CKP) Sensor signal and the CMP Sensor signal coincide, it signifies the timing point for cylinder 1. Recognizing cylinder 1 is needed for the sequential fuel injection and knock sensing.

Diagnostic conditions
The first 100 crankshaft revolutions after engine start-up are not considered. After that the constant monitoring begins.





Wiring Diagram.









* Install only ignition distributors as from production date 563.

Diagnostic Procedure
Check power supply to CMP Sensor.
1. Remove connector from ignition distributor.
2. Switch ignition on
3. Connect voltmeter to pin 1 (minus) and pin 3 (plus).
- Specified value: approx. 5 Volt.

Check power supply wiring for continuity.
1. Remove connector from ignition distributor.
2. Remove ECM connector.
3. Connect ohmmeter to ECM connector, pin 53 and to ignition distributor connector, pin 3.
- Specified value: 0 - 5 ohms.

- If meter reads infinite resistance, check connector X 60, pin 8.

4. Connect ohmmeter to ignition distributor connector, pin 1 and ground.
- Specified value: 0 - 5 ohms.

- If meter reads infinite resistance, check connector X 60, pin 1.

Check CMP Sensor signal.
1. Connect voltmeter to connector X 60, pin 1 (minus) and pin 15 (plus).
2. Start engine.
- Specified value: approximately 4 Volt.

Check signal wire from ECM to CMP Sensor.
1. Remove ignition distributor connector.
2. Remove ECM connector.
3. Connect ohmmeter to ECM connector, pin 21 and to ignition distributor connector pin 2.
- Specified value: 0 - 5 ohms.

- If meter reads infinite resistance, check connector X 60, pin 15.