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HOMESERVICE MANUALSACURA2004TL AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMPGM-FI SYSTEMECM/PCM REPLACEMENT
2004 Acura TL Automatic

ECM/PCM Replacement

2004 Acura TL AutomaticSECTION ECM/PCM Replacement
  1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
    Fig 1: Connecting HDS To Data Link Connector (DLC)
    G03659540Courtesy of AMERICAN HONDA MOTOR CO., INC.
  2. Make sure the HDS communicates with the ECM/PCM. If it doesn't, skip steps  3 to  6 and  17, and clean the throttle body (see THROTTLE BODY TEST ), and replace the engine oil (see OIL PRESSURE TEST ) after this procedure.
  3. Turn the ignition switch ON (II).
  4. Select the INSPECTION MENU with the HDS.
  5. Do the TP POSITION CHECK in the ETCS TEST.
  6. Select READ DATA in the REPLACE ECM/PCM with the HDS.
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Pull back the carpet.
  10. Remove the ducts (A).
    Fig 2: Removing Ducts
    G03659541Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Disconnect ECM/PCM connectors (B).
  12. Remove the bolts (C), then remove the ECM/PCM (D).
  13. Install the ECM/PCM in the reverse order of removal.
  14. Open the SCS with the HDS.
  15. Turn the ignition switch ON (II).
    NOTE: For 2005-2006 models: DTC P0630 "VIN Not Programmed or Mismatch" may be stored because the VIN has not been programmed into the ECM/PCM; ignore it, and continue this procedure.
  16. 2005-2006 models: Input the VIN to the ECM/PCM with the HDS.
  17. Select WRITE DATA in the REPLACE ECM/PCM menu with the HDS.
  18. Rewrite the immobilizer code with the ECM/PCM replacement procedure in the HDS; it allows you to start the engine.
  19. Reset the ECM/PCM with the HDS.
  20. Do the ECM/PCM IDLE LEARN PROCEDURE .
  21. Do the CKP pattern clear/pattern learn procedure (see CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN ).
RENDER: 1.0x

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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.