2007 Honda Element SC, AutomaticFACTORY OEM SERVICE PROCEDURE

DTC P0340: CMP Sensor A No Signal

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine.
  4. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0340 indicated? 

    YES  - Go to step  5.

    NO  - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM.

  5. Turn the ignition switch OFF.
  6. Disconnect the CMP sensor A 3P connector.
  7. Turn the ignition switch ON (II).
  8. Measure voltage between CMP sensor A 3P connector terminal No. 3 and body ground.

    Is there battery voltage? 

    YES  - Go to step  9.

    NO  - Repair open in the wire between the No. 4 ACG (10 A) fuse in the under-dash fuse/relay box and CMP sensor A, then go to step  18.

    Fig 1: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No. 3 & Body Ground
    G05449171Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Measure voltage between CMP sensor A 3P connector terminal No. 1 and body ground.

    Is there about 5 V? 

    YES  - Go to step  1010.

    NO  - Go to step  11.

    Fig 2: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No. 1 & Body Ground
    G05449172Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Measure voltage between CMP sensor A 3P connector terminals No. 2 and No. 3.

    Is there battery voltage? 

    YES  - Go to step  16.

    NO  - Repair open in the wire between CMP sensor A and G101, then go to step  18.

    Fig 3: Measuring Voltage Between CMP Sensor A 3P Connector Terminals No. 2 & No. 3
    G05449173Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Measure voltage between ECM/PCM connector terminal A19 and body ground.

    Is there about 5 V? 

    YES  - Repair open in the wire between the ECM/PCM (A19) and CMP sensor A, then go to step  18.

    NO  - Go to step  12.

    Fig 4: Measuring Voltage Between ECM/PCM Connector Terminal A19 & Body Ground
    G05449174Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector A (31P).
  15. Check for continuity between ECM/PCM connector terminal A19 and body ground.

    Is there continuity? 

    YES  - Repair short in the wire between the ECM/PCM (A19) and CMP sensor A, then go to step  18.

    NO  - Go to step  24.

    Fig 5: Checking Continuity Between ECM/PCM Connector Terminal A19 & Body Ground
    G05449175Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Turn the ignition switch OFF.
  17. Replace CMP sensor A (see CMP SENSOR A REPLACEMENT  ).
  18. Reconnect all connectors.
  19. Turn the ignition switch ON (II).
  20. Reset the ECM/PCM with the HDS.
  21. Do ECM/PCM IDLE LEARN PROCEDURE .
  22. Start the engine.
  23. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0340 indicated? 

    YES  - Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM, then go to step  1.

    NO  - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

  24. Reconnect all connectors.
  25. Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  26. Start the engine, and let it idle.
  27. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0340 indicated? 

    YES  - Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM, then go to step  1. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  26. If the ECM/PCM was substituted, go to step  1.

    NO  - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.