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Home >> Acura >> 2007 >> TL Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Throttle Control System >> DTC Troubleshooting >> DTC U0107: Lost Communication With Throttle Actuator Control Module
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DTC U0107: Lost Communication With Throttle Actuator Control Module

CAUTION: Do not insert your fingers into the installed throttle body when you turn the ignition switch ON (II) or while the ignition switch is ON (II). If you do, you will seriously injure your fingers if the throttle valve is activated.
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? 

    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.

    NO  -Go to step 4.

  4. Start the engine.
  5. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC U0107 indicated? 

    YES  -Go to step  47.

    NO  -Intermittent failure, the 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? 

    YES  -Go to step 12.

    NO  -Go to step  13.

  12. Check the throttle valve again.

    Does the throttle valve open fully? 

    YES  -Go to step  41.

    NO  -Go to step  35.

  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
    G05458195Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 16.

    NO  -Repair open in the wire between the throttle body, the throttle actuator control module, and G101, then go to step  51.

  16. Remove the throttle actuator control module relay (A).
    Fig 2: Identifying Throttle Actuator Control Module Relay
    G05458196Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Measure voltage between throttle actuator control module relay 4P connector terminal No. 1 and body ground.
    Fig 3: Measuring Voltage Between Throttle Actuator Control Module Relay 4P Connector Terminal No. 1 And Body Ground
    G05458197Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  21.

    NO  -Go to step 18.

  18. Check the No. 1 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse in under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Repair open in the wire between the throttle actuator control module relay (+B line) and the No. 1 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse, then go to step  51.

    NO  -Go to step 19.

  19. Check for continuity between throttle actuator control module relay 4P connector terminal No. 1 and body ground.
    Fig 4: Checking Continuity Between Throttle Actuator Control Module Relay 4P Connector Terminal No. 1 And Body Ground
    G05458198Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between the throttle actuator control module relay and the No. 1 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse, then go to step  51.

    NO  -Go to step 20.

  20. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground.
    Fig 5: Checking Continuity Between Throttle Actuator Control Module 16P Connector Terminal No. 2 And Body Ground
    G05458199Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    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  51.

    NO  -Substitute a known-good throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51.

  21. Install the throttle actuator control module relay.
  22. Turn the ignition switch ON (II).
  23. Measure voltage between throttle actuator control module 16P connector terminal No. 2 and body ground.
    Fig 6: Measuring Voltage Between Throttle Actuator Control Module 16P Connector Terminal No. 2 And Body Ground
    G05458200Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Substitute a known-good throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51.

    NO  -Go to step 24.

  24. Turn the ignition switch OFF.
  25. Remove the throttle actuator control module relay (A).
    Fig 7: Identifying Throttle Actuator Control Module Relay
    G05458201Courtesy of AMERICAN HONDA MOTOR CO., INC.
  26. Check the throttle actuator control module relay (see POWER RELAY TEST ).

    Is the throttle actuator control module relay OK? 

    YES  -Go to step 27.

    NO  -Replace the throttle actuator control module relay, then go to step  51.

  27. Turn the ignition switch ON (II).
  28. Measure voltage between throttle actuator control module relay 4P connector terminal No. 4 and body ground.
    Fig 8: Measuring Voltage Between Throttle Actuator Control Module Relay 4P Connector Terminal No. 4 And Body Ground
    G05458202Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 29.

    NO  -Repair open in the wire between the throttle actuator control module relay and PGM-FI main relay 1, then go to step  51.

  29. Turn the ignition switch OFF.
  30. Jump the SCS line with the HDS.
  31. Disconnect ECM/PCM connector E (31P).
  32. Check for continuity between ECM/PCM connector terminal E3 and throttle actuator control module relay 4P connector terminal No. 3.
    Fig 9: Checking Continuity Between ECM/PCM Connector Terminal E3 And Throttle Actuator Control Module Relay 4P Connector Terminal No. 3
    G05458203Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 33.

    NO  -Repair open in the wire between the ECM/PCM (E3) and the throttle actuator control module relay, then go to step  51.

  33. Connect throttle actuator control module relay 4P connector terminal No. 2 to body ground with a jumper wire.
    Fig 10: Connecting Throttle Actuator Control Module Relay 4P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G05458204Courtesy of AMERICAN HONDA MOTOR CO., INC.
  34. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground.
    Fig 11: Checking Continuity Between Throttle Actuator Control Module 16P Connector Terminal No. 2 And Body Ground
    G05458205Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  57.

    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  51.

  35. Turn the ignition switch OFF.
  36. Jump the SCS line with the HDS.
  37. Disconnect the throttle actuator control module 16P connector.
  38. Disconnect ECM/PCM connector A (31P).
  39. Check for continuity between ECM/PCM connector terminal A25 and body ground.
    Fig 12: Checking Continuity Between ECM/PCM Connector Terminal A25 And Body Ground
    G05458206Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between the ECM/PCM (A25) and the throttle actuator control module, then go to step  51.

    NO  -Go to step 40.

  40. Check for continuity between ECM/PCM connector terminal A25 and throttle actuator control module 16P connector terminal No. 6.
    Fig 13: Checking Continuity Between ECM/PCM Connector Terminal A25 And Throttle Actuator Control Module 16P Connector Terminal No. 6
    G05458207Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51. If DTC U0107 is indicated, then go to step  57.

    NO  -Repair open in the wire between the ECM/PCM (A25) and the throttle actuator control module, then go to step  51.

  41. Turn the ignition switch OFF.
  42. Jump the SCS line with the HDS.
  43. Disconnect the throttle actuator control module 16P connector.
  44. Disconnect ECM/PCM connector A (31P).
  45. Check for continuity between ECM/PCM connector terminal A26 and body ground.
    Fig 14: Checking Continuity Between ECM/PCM Connector Terminal A26 And Body Ground
    G05458208Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between the ECM/PCM (A26) and the throttle actuator control module, then go to step  51.

    NO  -Go to step 46.

  46. Check for continuity between ECM/PCM connector terminal A26 and throttle actuator control module 16P connector terminal No. 14.
    Fig 15: Checking Continuity Between ECM/PCM Connector Terminal A26 And Throttle Actuator Control Module 16P Connector Terminal No. 14
    G05458209Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module (see APP SENSOR REPLACEMENT  ), then go to step  51. If DTC U0107 is indicated, then go to step  57.

    NO  -Repair open in the wire between the ECM/PCM (A26) and the throttle actuator control module, then go to step  51.

  47. Turn the ignition switch OFF.
  48. Jump the SCS line with the HDS.
  49. Disconnect ECM/PCM connectors B (24P) and A (31P).
  50. Check for continuity between body ground and ECM/PCM connector terminals B15 and A3 individually.
    Fig 16: Checking Continuity Between Body Ground And ECM/PCM Connector Terminals B15 And A3 Individually
    G05458210Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    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.

    NO  -Repair open in the wire between the ECM/PCM (B15, A3) and G101, then go to step 51.

  51. Turn the ignition switch OFF.
  52. Reconnect all connectors.
  53. Turn the ignition switch ON (II).
  54. Reset the ECM/PCM with the HDS.
  55. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  56. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC U0107 indicated? 

    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.

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

  57. Reconnect all connectors.
  58. 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 ).
  59. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC U0107 indicated? 

    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. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. 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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