Circuit/System Testing

P0342 and P0343

1. Ignition OFF, disconnect the appropriate camshaft position (CMP) sensor wire harness connector.
2. Test for less than 1 ohm of resistance between the appropriate low reference circuit terminal B and ground.
   • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between the appropriate 5-volt reference circuit terminal A and ground.
   • If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
   • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Ignition ON, test for 4.8-5.2 volts between the appropriate signal circuit terminal C and ground.
   • If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
   • If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition OFF, connect a fused jumper wire to the CMP signal circuit terminal C.
6. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CMP active counter parameter on the scan tool should increment.
   • If the CMP active counter increments, replace the CMP sensor.
   • If the CMP active counter does not increment, replace the ECM.

P0341

1. Ignition OFF, inspect the CMP sensor for correct installation.
   • If the sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary.
2. Inspect the engine for the following conditions:
   • The engine oil for debris
   • The camshaft reluctor wheel for damage
   • The timing chain, tensioner, and sprockets for wear or damage

• If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components.