2004 Acura TL AutomaticFACTORY OEM SERVICE PROCEDURE

DTC P2552: Throttle Actuator Control Module Relay Malfunction (2006 Model)

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. Do the ETCS TEST in the INSPECTION MENU with the HDS.

    Is the RELAY Circuit OK? 

    1. YES  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM/ PCM.
    2. NO  - Go to step  4.
  4. Turn the ignition switch OFF.
  5. Jump the SCS line with the HDS.
  6. Remove the throttle actuator control module relay (A).
    Fig 1: Removing Throttle Actuator Control Module Relay
    G03659610Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Disconnect ECM/PCM connector E (31P).
  8. Check for continuity between ECM/PCM connector terminal E3 and body ground.
    Fig 2: Checking Continuity Between ECM/PCM Connector Terminal E3 & body ground
    G03659611Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the throttle actuator control module relay and the ECM/PCM (E3), then go to step  10.
    2. NO  - Go to step  9.
  9. Test the throttle actuator control module relay (see POWER RELAY TEST ).

    Is the relay OK? 

    1. YES  - Go to step  17.
    2. NO  - Replace the throttle actuator control module relay, then go to step 10.
  10. Reconnect ECM/PCM connector E (31P).
  11. Turn the ignition switch ON (II).
  12. Reset the ECM/PCM with the HDS.
  13. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  14. Turn the ignition switch OFF.
  15. Turn the ignition switch ON (II), and wait 10 seconds.
  16. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P2552 is indicated, check for poor connections or loose terminals at 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 DTCs troubleshooting.
    2. NO  - Troubleshooting is complete.
  17. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM ).
  18. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P2552 is indicated, check for poor connections or loose terminals at 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 DTCs 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.