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DTC P16C4: Engine Mount Actuator Control Power Circuit Stuck OFF

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshots, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION  ).
  1. Turn the ignition switch to ON (II).
  2. Check the ACM UNIT SUPPLY VOLTAGE in the DATA LIST with the HDS.

    Is there battery voltage? 

    YES  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the engine mount control unit and the driver's under-dash fuse/relay box (active control engine mount (ACM) control relay).

    NO  -Go to step 3.

  3. Turn the ignition switch to LOCK (0),
  4. Inspect the No.B14 ACM (10A) fuse in the driver's under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step 9.

    NO  -Go to step 5.

  5. Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  6. Disconnect driver's under-dash fuse/relay box connector G (13P).
  7. Disconnect the engine mount control unit 16P connector.
  8. Check for continuity between engine mount control unit 16P connector terminal No. 6 and body ground.
    Fig 1: Checking Continuity Between Engine Mount Control Unit 16P Connector Terminal No. 6 And Body Ground
    G06418981Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short a ground in the wire between engine mount control unit 16P connector terminal No. 6 and the driver's under-dash fuse/relay box (ACM control relay). Also replace the No.B14 ACM (10A) fuse, then go to step 25.

    NO  -Check the driver's under-dash fuse/relay box, and replace it if needed. Also replace the No. B14 ACM (10A) fuse, then go to step 25.

  9. Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  10. Disconnect engine mount control unit 16P connector.
  11. Turn the ignition switch to ON (II).
  12. Measure the voltage between engine mount control unit 16P connector terminal No. 16 and body ground.
    Fig 2: Checking Continuity Between Engine Mount Control Unit 16P Connector Terminal No. 6 And Body Ground
    G00509416Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 16.

    NO  -Go to step 13.

  13. Turn the ignition switch to LOCK (0).
  14. Disconnect driver's under-dash fuse/relay box connector G (13P).
  15. Check for continuity between engine mount control unit 16P connector terminal No. 16 and driver's under-dash fuse/relay box connector G (13P) terminal No. 7.
    Fig 3: Identifying Engine Mount Control Unit 16P Connector Terminal Location
    G06418982Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the driver's under-dash fuse/relay box; USA models (see USA MODELS ), Canada models (see CANADA MODELS ), then go to  25 .

    NO  -Repair an open in the wire between engine mount control unit 16P connector terminal No. 16 and driver's under-dash fuse/relay box connector G terminal No. 7, then go to step 25.

  16. Turn the ignition switch to LOCK (0).
  17. Connect engine mount control unit 16P connector terminal No. 16 and body ground with a jumper wire.
    Fig 4: Connecting Engine Mount Control Unit 16P Connector Terminal No. 16 And Body Ground With Jumper Wire
    G06418984Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Turn the ignition switch to ON (II).
  19. Measure the voltage between engine mount control unit 16P connector terminal No. 6 and body ground.
    Fig 5: Measuring Voltage Between Engine Mount Control Unit 16P Connector Terminal No. 6 And Body Ground
    G06418985Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 23.

    NO  -Go to step 20.

  20. Turn the ignition switch to LOCK (0).
  21. Disconnect driver's under-dash fuse/relay box connector G (13P).
  22. Check for continuity between engine mount control unit 16P connector terminal No. 6 and driver's under-dash fuse/relay box connector G (13P) terminal No. 4
    Fig 6: Identifying Engine Mount Control Unit 16P Connector Terminal Location
    G00509417Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the driver's under-dash fuse/relay box; USA models (see USA MODELS ). Canada models (see CANADA MODELS ), then go to  25 .

    NO  -Repair an open in the wire between engine mount control unit 16P connector terminal No. 6 and driver's under-dash fuse/relay box connector G terminal No. 4, then go to 25 .

  23. Turn the ignition switch to LOCK (0).
  24. Check for continuity between engine mount control unit 16P connector terminal No. 4 and body ground.
    Fig 7: Measuring Voltage Between Engine Mount Control Unit 16P Connector Terminal No. 6 And Body Ground
    G00509418Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the engine mount control unit (see Engine Mount Control Unit Replacement  ), then go to next step.

    NO  -Repair an open in the wire between engine mount control unit 16P connector terminal No. 4 body ground G302, then go to next step.

  25. Reconnect all connectors.
  26. Turn the ignition switch to ON (II).
  27. Clear the DTC with the HDS (see HDS CLEAR COMMAND  ).
  28. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P16C4 indicated? 

    YES  -Check for poor connections or loose terminals at the engine mount control unit and the driver's under-dash fuse/relay box (active control engine mount (ACM) control relay), then go to step  1.

    NO  -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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