LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2012 >> MDX >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Throttle Control System >> DTC Troubleshooting >> DTC P2118: Throttle Actuator Current Range/Performance Problem
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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).
  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 PCM.

  5. Turn the ignition switch to LOCK (0).
  6. Jump the SCS line with the HDS.
  7. Disconnect the throttle body 6P connector.
  8. Disconnect PCM connector B (49P).
  9. Check for continuity between PCM connector terminal B33 and throttle body 6P connector terminal No. 4.
    Fig 1: Checking Continuity Between PCM Connector Terminal B33 And Throttle Body 6P Connector Terminal No. 4
    G08054619Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 10.

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

  10. Disconnect 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
    G08054620Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wires between throttle body 6P connector terminals 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
    G08054621Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a 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
    G08054622Courtesy 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
    G08054623Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Check for continuity between PCM connector terminals C2 and C3.
    Fig 6: Checking Continuity Between PCM Connector Terminals C2 And C3
    G08054624Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 16.

    NO  -Repair an open in the wires between the throttle body and the 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
    G08054625Courtesy 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).
  20. Reset the PCM with the HDS.
  21. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  22. Turn the ignition switch to LOCK (0).
  23. Turn the ignition switch to ON (II).
  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 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 PCM if it does not have the latest software (see KNOCK SENSOR REPLACEMENT ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  28. Turn the ignition switch to LOCK (0).
  29. Turn the ignition switch to ON (II).
  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 PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  28. If the PCM was substituted, go to step 1.

    NO  -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 are indicated, go to the indicated DTC's troubleshooting.

scientia non olet · About LEMON Manuals