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DTC P1077: IMT Valve Stuck in High RPM Position

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. 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 snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Do the IMT TEST in the INSPECTION MENU with the HDS.

    Is the result OK? 

    YES  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IMT actuator and the PCM.

    NO  -Go to step 4.

  4. Turn the ignition switch to LOCK (0).
  5. Disconnect the IMT actuator 5P connector.
  6. Turn the ignition switch to ON (II).
  7. Measure the voltage between IMT actuator 5P connector terminal No. 1 and body ground.
    Fig 1: Measuring Voltage Between IMT Actuator 5P Connector Terminal No. 1 And Body Ground
    G08052594Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Go to step  12.

    NO  -Go to step 8.

  8. Turn the ignition switch to LOCK (0).
  9. Jump the SCS line with the HDS.
  10. Disconnect PCM connector C (49P).
  11. Check for continuity between IMT actuator 5P connector terminal No. 1 and PCM connector terminal C11.
    Fig 2: Checking Continuity Between IMT Actuator 5P Connector Terminal No. 1 And PCM Connector Terminal C11
    G08052595Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  36.

    NO  -Repair an open in the wire between the PCM (C11) and the IMT actuator, then go to step  30.

  12. Measure the voltage between IMT actuator 5P connector terminal No. 3 and body ground.
    Fig 3: Measuring Voltage Between IMT Actuator 5P Connector Terminal No. 3 And Body Ground
    G08052596Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Go to step  17.

    NO  -Go to step 13.

  13. Turn the ignition switch to LOCK (0).
  14. Jump the SCS line with the HDS.
  15. Disconnect PCM connector B (49P).
  16. Check for continuity between IMT actuator 5P connector terminal No. 3 and PCM connector terminal B19.
    Fig 4: Checking Continuity Between IMT Actuator 5P Connector Terminal No. 3 And PCM Connector Terminal B19
    G08052597Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  36.

    NO  -Repair an open in the wire between the PCM (B19) and the IMT actuator, then go to step  30.

  17. Turn the ignition switch to LOCK (0).
  18. Jump the SCS line with the HDS.
  19. Disconnect PCM connector C (49P).
  20. Check for continuity between IMT actuator 5P connector terminal No. 2 and PCM connector terminal C16.
    Fig 5: Checking Continuity Between IMT Actuator 5P Connector Terminal No. 2 And PCM Connector Terminal C16
    G08052598Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 21.

    NO  -Repair an open in the wire between the PCM (C16) and the IMT actuator, then go to step  30.

  21. Check for continuity between PCM connector terminal C48 and body ground.
    Fig 6: Checking Continuity Between PCM Connector Terminal C48 And Body Ground
    G08052599Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the PCM (C48) and the IMT actuator, then go to step  30.

    NO  -Go to step 22.

  22. Check for continuity between PCM connector terminal C49 and body ground.
    Fig 7: Checking Continuity Between PCM Connector Terminal C49 And Body Ground
    G08052600Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the PCM (C49) and the IMT actuator, then go to step  30.

    NO  -Go to step 23.

  23. Check for continuity between IMT actuator 5P connector terminal No. 5 and PCM connector terminal C48.
    Fig 8: Checking Continuity Between IMT Actuator 5P Connector Terminal No. 5 And PCM Connector Terminal C48
    G08052601Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 24.

    NO  -Repair an open in the wire between the PCM (C48) and the IMT actuator, then go to step  30.

  24. Check for continuity between IMT actuator 5P connector terminal No. 4 and PCM connector terminal C49.
    Fig 9: Checking Continuity Between IMT Actuator 5P Connector Terminal No. 4 And PCM Connector Terminal C49
    G08052602Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 25.

    NO  -Repair an open in the wire between the PCM (C49) and the IMT actuator, then go to step  30.

  25. Remove the IMT actuator (see IMT ACTUATOR REPLACEMENT  ).
  26. Move the IMT valve by hand.

    Does it move smoothly? 

    YES  -Go to step 27.

    NO  -Remove the engine cover (see step 6 under ENGINE REMOVAL ), and repair the stuck valve. If needed, replace the intake manifold (see INTAKE MANIFOLD REMOVAL AND INSTALLATION ), then go to step  30.

  27. Substitute a known-good IMT actuator (see IMT ACTUATOR REPLACEMENT  ).
  28. Turn the ignition switch to ON (II).
  29. Do the IMT TEST in the INSPECTION MENU with the HDS.

    Is the result-OK? 

    YES  -Replace the original IMT actuator, then go to step 30.

    NO  -Go to step  36.

  30. Reconnect all connectors.
  31. Turn the ignition switch to ON (II).
  32. Reset the PCM with the HDS.
  33. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  34. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P1077 indicated? 

    YES  -Check for poor connections or loose terminals at the IMT actuator and the PCM, then go to step  1.

    NO  -Go to step 35.

  35. Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  34, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the PCM, then go to step  1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

  36. Reconnect all connectors.
  37. Update the PCM if it does not have the latest software (see KNOCK SENSOR REPLACEMENT ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  38. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
  39. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P1077 indicated? 

    YES  -Check for poor connections or loose terminals at the IMT actuator and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  38. If the PCM was substituted, go to step  1.

    NO  -Go to step 40.

  40. Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs were indicated in step  39, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  38. If the PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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