ECM Replacement

Special Tools Required 

• Honda diagnostic system (HDS) tablet tester
• Honda interface module (HIM) and an iN workstation with the latest HDS software version
• HDS pocket tester
• GNA600 and an iN workstation with the latest HDS software version

Any one of the above updating tools can be used.

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
   Fig 1: Identifying HDS To Data Link Connector (DLC)

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the ECM and other vehicle systems. If it doesn't, go to the DLC CIRCUIT TROUBLESHOOTING  . If you are returning from DLC circuit troubleshooting, skip steps 4 through  7,  18 through  20,  23, and  24, and do this after replacing the ECM:
   • Replace the engine oil (see ENGINE OIL REPLACEMENT ) and the engine oil filter (see ENGINE OIL FILTER REPLACEMENT ).
   • Clean the throttle body (see THROTTLE BODY CLEANING ).
4. Select the PGM-FI system with the HDS.
5. Select the INSPECTION MENU with the HDS.
6. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the screen prompts.
   NOTE: If the TP POSITION CHECK indicates FAILED, continue with this procedure.
7. Select the REPLACE ECM MENU, then READ DATA, and follow the screen prompts.
   NOTE:

   • Doing this step copies (READS) the engine oil life data from the original ECM so you can later download (WRITES) it into the new ECM.
   • If READ DATA indicates FAILED, continue with this procedure.
8. Turn the ignition switch to LOCK (0).
9. Jump the SCS line with the HDS.
10. Do the battery removal procedure (see BATTERY REMOVAL AND INSTALLATION ).
11. Remove the cover (A).
    Fig 2: Identifying ECM Cover

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Remove the bolts (D), then remove the ECM (E).
    Fig 3: Identifying ECM Cover Bolts

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. Disconnect ECM connectors A, B, and C.
    NOTE: ECM connectors A, B, and C have symbols (A=□, B=Δ, C=◦) embossed on them for identification.
14. Install the ECM in the reverse order of removal.
15. Do the battery installation procedure (see BATTERY REMOVAL AND INSTALLATION ).
16. Turn the ignition switch to ON (II).
17. Manually input the VIN to the ECM with the HDS.
    NOTE: DTC P0630 VIN Not Programmed or Mismatch may be stored because the VIN has not been programmed into the ECM; ignore it, and continue this procedure.
18. If the READ DATA (engine oil life) failed in step  8, go to step  21. Otherwise, go to step 19.
19. Select the PGM-FI system with the HDS.
20. Select the REPLACE ECM MENU, then WRITE DATA, and follow the screen prompts.
    NOTE: If the WRITE DATA indicates FAILED, continue with this procedure.
21. Select IMMOBI system with the HDS.
22. Enter the immobilizer code that you got from the iN, or use the ECM replacement procedure in the HDS; it allows you to start the engine.
23. If the TP POSITION CHECK failed in step  6 clean the throttle body (see THROTTLE BODY CLEANING ), then go to step 24.
24. If the READ DATA failed in step  7 or the WRITE DATA failed in step  20, replace the engine oil (see ENGINE OIL REPLACEMENT ) and engine oil filter (see ENGINE OIL FILTER REPLACEMENT ), then go to step 25.
25. Select PGM-FI system, and reset the ECM with the HDS.
26. Update the ECM if it does not have the latest software (see ECM UPDATE  ).
27. Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).
28. Do the CKP pattern clear/CKP pattern learn procedure (see CKP PATTERN CLEAR/CKP PATTERN LEARN ).