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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 69 (ELECTRONIC THROTTLE CONTROL SYSTEM)DTC TROUBLESHOOTINGDTC P2552: THROTTLE ACTUATOR CONTROL MODULE RELAY MALFUNCTION
2002 Honda Civic Si

DTC P2552: Throttle Actuator Control Module Relay Malfunction

2002 Honda Civic SiSECTION DTC P2552: Throttle Actuator Control Module Relay Malfunction
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
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. Reset the PCM with the HDS.
  3. Do the ETCS TEST in the INSPECTION MENU with the HDS.

    Is ETCS SYSTEM OK? 

    1. YES  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module and the PCM.
    2. NO  - Go to step 4.
  4. Turn the ignition switch OFF.
  5. Jump the SCS line with the HDS.
  6. Turn the ignition switch ON (II).
  7. Disconnect PCM connector A (73P).
  8. Disconnect the throttle actuator control module 16P connector.
  9. Measure voltage between PCM connector A29 and body ground.
    Fig 1: Measuring Voltage Between PCM Connector A29 And Body Ground
    G03639865Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Repair short in the wire between the PCM and the throttle actuator control module, then go to step  13.
    2. NO  - Go to step 10.
  10. Turn the ignition switch OFF.
  11. Replace the throttle body assembly (see THROTTLE BODY REMOVAL/INSTALLATION ).
  12. Turn the ignition switch ON (II).
  13. Reset the PCM with the HDS.
  14. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  15. 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 body and the 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.
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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.