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Home >> Honda >> 2007 >> Accord SE, 3.0 CM6 >> Repair and Diagnosis >> Engine Performance >> System >> Electronic Throttle Control System (V6) >> DTC Troubleshooting >> DTC U0107: Lost Communication With Throttle Actuator Control Module

DTC U0107: Lost Communication With Throttle Actuator Control Module

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 ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC U0107 indicated? 

    1. YES  - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module, and the ECM/PCM, then go to step  50. If the connections are OK, go to step  6.
    2. NO  - Go to step 4.
  4. Start the engine.
  5. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC U0107 indicated? 

    1. YES  - Go to step  46.
    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM.
  6. Clear the DTC with the HDS.
  7. Turn the ignition switch OFF.
  8. Disconnect the intake air duct from the throttle body.
  9. Press the accelerator pedal to the floor.
  10. Turn the ignition switch ON (II).
  11. Check the throttle valve operation.

    Does it open after the throttle valve closes? 

    1. YES  - Go to step 12.
    2. NO  - Go to step  13.
  12. Check the throttle valve again.

    Does the throttle valve open fully? 

    1. YES  - Go to step  40.
    2. NO  - Go to step  34.
  13. Turn the ignition switch OFF.
  14. Disconnect the throttle actuator control module 16P connector.
  15. Check for continuity between throttle actuator control module 16P connector terminal No. 7 and body ground.
    Fig 1: Checking Continuity Between Throttle Actuator Control Module 16P Connector Terminal No. 7 And Body Ground
    G03671865Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step  16.
    2. NO  - Repair open in the wire between the throttle body, the throttle actuator control module, and G101, then go to step  50.
  16. Remove the throttle actuator control module relay (A).
    Fig 2: Removing Throttle Actuator Control Module Relay
    G03671866Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Measure voltage between throttle actuator control module relay 4P connector terminal No. 2 and body ground.
    Fig 3: Measuring Voltage Between Throttle Actuator Control Module Relay 4P Connector Terminal No. 2 And Body Ground
    G03671867Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step  19.
    2. NO  - Go to step 18.
  18. Check the No. 1 THROTTLE ACTUATOR CONTROL (15 A) fuse in under-dash fuse/relay box.

    Is the fuse OK? 

    1. YES  - Repair open in the wire between the throttle actuator control module relay (+B line) and the No. 1 THROTTLE ACTUATOR CONTROL (15 A) fuse, then go to step  50.
    2. NO  - Repair short in the wire between the throttle actuator control module relay (+B line) and the No. 1 THROTTLE ACTUATOR CONTROL (15 A) fuse, then go to step  50.
  19. Install the throttle actuator control module relay.
  20. Turn the ignition switch ON (II).
  21. Measure voltage between throttle actuator control module 16P connector terminal No. 2 and body ground.
    Fig 4: Measuring Voltage Between Throttle Actuator Control Module 16P Connector Terminal No. 2 And Body Ground
    G03671868Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage for about 2 seconds? 

    1. YES  - Substitute a known-good throttle actuator control module (see APP SENSOR REPLACEMENT ), then go to step  50 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see APP SENSOR REPLACEMENT ), then go to step  50.
    2. NO  - Go to step 22.
  22. Turn the ignition switch OFF.
  23. Remove the throttle actuator control module relay (A).
    Fig 5: Removing Throttle Actuator Control Module Relay
    G03671869Courtesy of AMERICAN HONDA MOTOR CO., INC.
  24. Check the throttle actuator control module relay (see POWER RELAY TEST ).

    Is the throttle actuator control module relay OK? 

    1. YES  - Go to step 25.
    2. NO  - Replace the throttle actuator control module relay, then go to step  50.
  25. Turn the ignition switch ON (II).
  26. Measure voltage between throttle actuator control module relay 4P connector terminal No. 4 and body ground.
    Fig 6: Measuring Voltage Between Throttle Actuator Control Module Relay 4P Connector Terminal No. 4 And Body Ground
    G03671870Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 27.
    2. NO  - Repair open in the wire between the throttle actuator control module relay and PGM-FI main relay 1 (Fl MAIN), then go to step  50.
  27. Turn the ignition switch OFF.
  28. Jump the SCS line with the HDS.
  29. Disconnect ECM/PCM connector A (31P).
  30. Check for continuity between ECM/PCM connector terminal A3 and throttle actuator control module relay 4P connector terminal No. 3.
    Fig 7: Checking Continuity Between ECM/PCM Connector Terminal A3 And Throttle Actuator Control Module Relay
    G03671871Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 31.
    2. NO  - Repair open in the wire between the ECM/ PCM (A3) and the throttle actuator control module relay, then go to step  50.
  31. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground.
    Fig 8: Checking Continuity Between Throttle Actuator Control Module 16P Connector Terminal No. 2 And Body Ground
    G03671872Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the throttle actuator control module and the throttle actuator control module relay (+B line), then go to step  50.
    2. NO  - Go to step 32.
  32. Connect throttle actuator control module relay 4P connector terminal No. 2 to body ground with a jumper wire.
    Fig 9: Connecting Throttle Actuator Control Module Relay 4P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G03671873Courtesy of AMERICAN HONDA MOTOR CO., INC.
  33. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground.
    Fig 10: Checking Continuity Between Throttle Actuator Control Module 16P Connector Terminal No. 2 And Body Ground
    G03671874Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step  57.
    2. NO  - Repair open in the wire between the throttle actuator control module and the throttle actuator control module relay (+B line), then go to step  50.
  34. Turn the ignition switch OFF.
  35. Jump the SCS line with the HDS.
  36. Disconnect the throttle actuator control module 16P connector.
  37. Disconnect ECM/PCM connector E (31P).
  38. Check for continuity between ECM/PCM connector terminal E25 and body ground.
    Fig 11: Checking Continuity Between ECM/PCM Connector Terminal E25 And Body Ground
    G03671875Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the ECM/ PCM (E25) and the throttle actuator control module, then go to step  50.
    2. NO  - Go to step 39.
  39. Check for continuity between ECM/PCM connector terminal E25 and throttle actuator control module 16P connector terminal No. 6.
    Fig 12: Checking Continuity Between ECM/PCM Connector Terminal E25 And Throttle Actuator Control Module
    G03671876Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Substitute a known-good throttle actuator control module (see APP SENSOR REPLACEMENT ), then go to step  50 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see APP SENSOR REPLACEMENT ), then go to step  50. If DTC U0107 is indicated, then go to step  57.
    2. NO  - Repair open in the wire between the ECM/PCM (E25) and the throttle actuator control module, then go to step  50.
  40. Turn the ignition switch OFF.
  41. Jump the SCS line with the HDS.
  42. Disconnect the throttle actuator control module 16P connector.
  43. Disconnect ECM/PCM connector E (31P).
  44. Check for continuity between ECM/PCM connector terminal E26 and body ground.
    Fig 13: Checking Continuity Between ECM/PCM Connector Terminal E26 And Body Ground
    G03671877Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the ECM/ PCM (E26) and the throttle actuator control module, then go to step  50.
    2. NO  - Go to step 45.
  45. Check for continuity between ECM/PCM connector terminal E26 and throttle actuator control module 16P connector terminal No. 14.
    Fig 14: Checking Continuity Between ECM/PCM Connector Terminal E26 And Throttle Actuator Control Module
    G03671878Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Substitute a known-good throttle actuator control module (see APP SENSOR REPLACEMENT ), then go to step  50 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see APP SENSOR REPLACEMENT ), then go to step  50. If DTC U0107 is indicated, then go to step  57.
    2. NO  - Repair open in the wire between the ECM/ PCM (E26) and the throttle actuator control module, then go to step  50.
  46. Turn the ignition switch OFF.
  47. Jump the SCS line with the HDS.
  48. Disconnect ECM/PCM connectors B (24P) and E (31P).
  49. Check for continuity between body ground and ECM/PCM connector terminals B15 and E3 individually.
    Fig 15: Checking Continuity Between Body Ground And ECM/PCM Connector Terminals B15 And E3
    G03671879Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step  1.
    2. NO  - Repair open in the wire between the ECM/ PCM (B15, E3) and G101, then go to step 50.
  50. Turn the ignition switch OFF.
  51. Reconnect all connectors.
  52. Turn the ignition switch ON (II).
  53. Reset the ECM/PCM with the HDS.
  54. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  55. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, 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.
  56. Reconnect all the connectors.
  57. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ).
  58. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM/PCM, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
    2. 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 ).
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