Faulty Signal. Permanent Fault

Checking Ground Lead
- Ignition OFF.
- Wait for approx. 150 seconds (cars with immobilizer 245 seconds).
- Disconnect the camshaft position (CMP) sensor.
- Connect an ohmmeter between the camshaft position sensor connector terminal 1 (engine control module (ECM) side) and ground.
- The ohmmeter should read approx. 0 ohms.

If reading is OK:
^ Proceed to: Checking Power Cable section below.

If reading is incorrect:
^ Proceed to: Checking Engine Control Module Connector section below.





Checking Engine Control Module Connector
- Ignition OFF.
- Camshaft position sensor disconnected.
- Check engine control module connector for contact resistance and oxidation and remedy.
- Engine control module connected.
- Connect an ohmmeter between the camshaft position sensor connector terminal 1 (engine control module side) and ground.
- The ohmmeter should read approx. 0 ohms.

If reading is OK:
^ The cause of the diagnostic trouble code (DTC) has been loose connections in the engine control module connector.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between camshaft position sensor terminal 1 and engine control module # A18 for an open-circuit.
^ Proceed to: Verification section below.





Checking Power Cable
- Ignition ON.
- Camshaft position sensor disconnected.
- Connect a voltmeter between camshaft position sensor terminal 3 (engine control module side) and ground.
- The voltmeter should read battery voltage.

If reading is OK:
^ Proceed to: Checking the Signal Cable section below.

If reading is incorrect:
^ Proceed to: Checking Engine Control Module Connector section below.





Checking Engine Control Module Connector
- Ignition OFF.
- Camshaft position sensor disconnected.
- Check engine control module connector for contact resistance and oxidation and remedy.
- Engine control module connected.
- Ignition ON.
- Connect a voltmeter between camshaft position sensor terminal 3 (engine control module side) and ground.
- The voltmeter should read battery voltage.

If reading is OK:
^ The cause of the diagnostic trouble code has been loose connections in the engine control module connector.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between camshaft position sensor terminal 3 and engine control module # A36 for an open-circuit.
^ Proceed to: Verification section below.





Checking the Signal Cable
- Ignition ON.
- Camshaft position sensor disconnected.
- Connect an electrician's screwdriver (3 W bulb at least) between camshaft position sensor connector terminal 2 (engine control module side) and ground.
- The bulb should not light.

If reading is OK:
^ Proceed to: Checking Signal Cable Voltage section below.

If reading is incorrect:
^ Check cable between the camshaft position sensor terminal 2 and engine control module # A21 for a short-circuit to supply voltage.
^ Proceed to: Verification section below.





Checking Signal Cable Voltage
- Ignition ON.
- Camshaft position sensor disconnected.
- Connect a voltmeter between camshaft position sensor terminal 2 (engine control module side) and ground.
- The voltmeter should read battery voltage.

If reading is OK:
^ Proceed to: Checking Camshaft Position Sensor section below.

If reading is incorrect:
^ Proceed to: Checking Signal Cable Resistance To Ground section below.





Checking Signal Cable Resistance To Ground
- Ignition OFF.
- Wait for approx. 150 seconds (cars with immobilizer 245 seconds).
- Camshaft position sensor disconnected.
- Connect an ohmmeter between the camshaft position sensor connector terminal 2 (engine control module side) and ground.
- Is resistance infinite?

Yes:
^ Proceed to: Checking Engine Control Module Connector section below.

No:
^ Check cable between the camshaft position sensor terminal 2 and engine control module # A21 for a short-circuit to ground
^ Proceed to: Verification section below.





Checking Engine Control Module Connector
- Ignition OFF.
- Camshaft position sensor disconnected.
- Check engine control module connector for contact resistance and oxidation and remedy.
- Engine control module connected.
- Ignition ON.
- Connect a voltmeter between camshaft position sensor terminal 2 (engine control module side) and ground.
- The voltmeter should read battery voltage.

If reading is OK:
^ The cause of the diagnostic trouble code has been loose connections in the engine control module connector.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between the camshaft position sensor terminal 2 and engine control module # A21 for an open-circuit.
^ Proceed to: Verification section below.





Checking camshaft position sensor
- Connect the camshaft position sensor.
- Erase diagnostic trouble code.
- Try to start engine and idle it.

Is a diagnostic trouble code stored?
^ No: The cause of the diagnostic trouble code has been loose connections in the camshaft position sensor and/or engine control module connectors.
^ Check connectors for contact resistance and oxidation and remedy.
^ Proceed to: Verification section below.

Yes:
^ Try a new camshaft position sensor.
^ Proceed to: Verification section below.





Checking Camshaft Position Sensor Signal
The camshaft position sensor may fail if there has been a short-circuit to supply voltage in the signal cable. Check camshaft position sensor as follows:

- Connect the camshaft position sensor.
- Erase diagnostic trouble code.
- Try to start engine and idle it.
- Is a diagnostic trouble code stored?

No:
^ Camshaft position sensor OK.
^ Proceed to: Verification section below.

Yes:
^ Try a new camshaft position sensor.
^ Proceed to: Verification section below.





Verification
After carrying out the repair, check that the fault has been remedied as follows:

- Ignition OFF.
- Reconnect connectors and reinstall components.
- Erase diagnostic trouble code.
- Start the engine and idle it.
- Is a diagnostic trouble code stored?

No:
^ Fault corrected.

Yes:
^ Proceed to: Fault-tracing Information section below.

Fault-tracing Information
The verification result shows that the fault persists.

- Do you want to exit fault-tracing?

Yes:
^ Fault not corrected.

No:
^ Proceed to: Checking Ground Lead section above.