Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- Start the engine, and let it idle for 10 seconds.
- Check the CMP NOISE A count in the DATA LIST with the HDS. Are 0 counts indicated? YES - Go to step 7 . NO - Go to step 5.
- Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
- Check the CMP NOISE A count in the DATA LIST with the HDS. Are 0 counts indicated? YES - Go to step 7. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CMP sensor A and the ECM.
- Check for poor or loose connections and terminals at these locations: CMP sensor A ECM Engine ground Body ground Are the connections and terminals OK? YES - Go to step 8. NO - Repair the connectors or terminals, then go to step 11 .
- Check for damage on the CMP sensor A pulser plate (see «CMP PULSE PLATE A REPLACEMENT»(ref-255508-S26606815002007060300000) ), Is the pulser plate damaged? YES - Replace the CMP sensor A pulser plate (see «CMP PULSE PLATE A REPLACEMENT»(ref-255508-S26606815002007060300000) ), then go to step 11 . NO - Go to step 9.
- Turn the ignition switch OFF.
- Replace CMP sensor A (see «CMP SENSOR A REPLACEMENT»(ref-255532-S06386515052007060300000) ).
- Turn the ignition switch ON (II).
- Reset the ECM with the HDS.
- Do the ECM idle learn procedure (see «ECM IDLE LEARN PROCEDURE»(ref-255526-S39475388272007060300000) ).
- Start the engine, and let it idle for 10 seconds.
- Check for Pending or Confirmed DTCs with the HDS. Is DTC P0344 indicated? YES - Check for poor connections or loose terminals at CMP sensor A and the ECM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTCs troubleshooting.