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Home >> Acura >> 2012 >> TL Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Throttle Control System >> DTC Troubleshooting >> DTC P2118: Throttle Actuator Current Range/Performance Problem
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DTC P2118: Throttle Actuator Current Range/Performance Problem

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), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Slowly press the accelerator pedal to the floor.
  4. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P2118 indicated? 

    YES  - Go to step 5.

    NO  - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM/PCM. ■

  5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  6. Jump the SCS line with the HDS.
  7. Disconnect the throttle body 6P connector.
  8. Disconnect ECM/PCM connector B (49P).
  9. Check for continuity between ECM/PCM connector terminal B33 and throttle body 6P connector terminal No. 4.
    Fig 1: Checking Continuity Between ECM/PCM Connector And Throttle Body 6P Connector
    G08069630Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 10.

    NO  - Repair open in the wire between the throttle body and the ECM/PCM (B33), then go to step  18.

  10. Disconnect ECM/PCM connector C (49P).
  11. Check for continuity between throttle body 6P connector terminals No. 5 and No. 6.
    Fig 2: Checking Continuity Between Throttle Body 6P Connector Terminals No. 5 And No. 6
    G08069631Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wires between throttle body 6P connector terminal No. 5 (ETCS- line) and No. 6 (ETCS+ line), then go to step  18.

    NO  - Go to step 12.

  12. Check for continuity between body ground and throttle body 6P connector terminals No. 5 and No. 6 individually.
    Fig 3: Checking Continuity Between Body Ground And Throttle Body 6P Connector Terminals No. 5 And No. 6
    G08069632Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire between the throttle body 6P connector and body ground, then go to step  18.

    NO  - Go to step 13.

  13. At the throttle body side, measure the resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed.
    Fig 4: Measuring Resistance Between Throttle Body 6P Connector Terminals No. 5 And No. 6
    G08069633Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1.0 Ω or less? 

    YES  - Go to step 14.

    NO  - Go to step  17.

  14. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
    Fig 5: Connecting Throttle Body 6P Connector Terminals No. 5 And No. 6 With Jumper Wire
    G08069634Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Check for continuity between ECM/PCM connector terminals C2 and C3.
    Fig 6: Checking Continuity Between ECM/PCM Connector Terminals C2 And C3
    G08069635Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 16.

    NO  - Repair open in the wire between the throttle body and the ECM/PCM (C2, C3), then go to step  18.

  16. At the throttle body side, check for continuity between body ground and throttle body 6P connector terminals No. 5 and No. 6 individually.
    Fig 7: Checking Continuity Between Body Ground And Throttle Body 6P Connector Terminals No. 5 And No. 6
    G08069636Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 17.

    NO  - Go to step  26.

  17. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
  18. Reconnect all connectors.
  19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  20. Reset the ECM/PCM with the HDS.
  21. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  24. Slowly press the accelerator pedal to the floor.
  25. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P2118 indicated? 

    YES  - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, 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. ■

  26. Reconnect all connectors.
  27. Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  28. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  29. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  30. Slowly press the accelerator pedal to the floor.
  31. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P2118 indicated? 

    YES  - Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  27. 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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting. ■

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