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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 140 (ACTIVE CONTROL ENGINE MOUNT (ACM) SYSTEM)DTC TROUBLESHOOTINGDTC P15AC: ENGINE MOUNT CONTROL UNIT INTERNAL CIRCUIT MALFUNCTION
2002 Honda Civic Si

DTC P15AC: Engine Mount Control Unit Internal Circuit Malfunction

2002 Honda Civic SiSECTION DTC P15AC: Engine Mount Control Unit Internal Circuit Malfunction
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P15AC indicated? 

    1. YES  - Go to step 4.
    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the engine mount control unit and the active control engine mount (ACM) actuator.
  4. Turn the ignition switch OFF.
  5. Replace the engine mount control unit (see ENGINE MOUNT CONTROL UNIT REPLACEMENT  ).
  6. Turn the ignition switch ON (II).
  7. Reset the PCM with the HDS.
  8. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  9. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P15AC is indicated, check for poor connections or loose terminals at the engine mount control unit and the active control engine mount (ACM) actuator, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
    2. NO  - Troubleshooting is complete.
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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.
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