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ECM/PCM Update

ECM/PCM Updating and Substitution for Testing

Special Tools Required
Honda interface module (HIM) EQS05A35570

Use this procedure when you have to substitute a known-good ECM/PCM in a troubleshooting procedure. Update the ECM/PCM only if the ECM/PCM does not have the latest software loaded.

NOTE: Do not turn the ignition switch OFF while updating the ECM/PCM. If you turn the ignition switch OFF before completion, the ECM/PCM can be damaged.

How to Update the ECM/PCM

NOTE:
- Make sure you have the latest software on the HDS.
- To ensure the latest program is installed, do an ECM/PCM update whenever the ECM/PCM is substituted or replaced.
- You can not update an ECM/PCM with the program it already has. It will only accept a new program.
- Before you update the ECM/PCM, make sure the vehicle's battery is fully charged.
- To prevent ECM/PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moonroof, door locks, etc.) during the update.
- If you need to diagnose the Honda interface module (HIM) because the HIM's red (# 3) light came on or was flashing during the update, leave the ignition switch in the ON (II) position when you disconnect the HIM from the data link connector (DLC). This will prevent ECM/ECM/PCM damage.
- High temperature in the engine compartment might cause the ECM/PCM to become too hot to run the update. If the engine has been running before this procedure, open the hood and cool the engine compartment.

1. Turn the ignition switch ON (II), but do not start the engine.




2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Make sure the HDS communicates with the ECM/PCM. If it doesn't, go to the DLC circuit troubleshooting. If you are returning from DLC circuit troubleshooting, skip steps 4 and 5, and clean the throttle body after updating the ECM/PCM.
4. Select the INSPECTION MENU with the HDS.
5. Select the TP POSITION CHECK in the ETCS TEST with the HDS.

NOTE: If there is no result from TP POSITION CHECK, clean the throttle body after this procedure.

6. If the HDS does not have the update function, disconnect the HDS from the vehicle and connect the Honda interface module (HIM).

7. If the software in the ECM/PCM is the latest, disconnect the HDS or the HIM from the DLC, and go back to the procedure that you were doing. If the software in the ECM/PCM is not the latest, do the ECM/PCM update procedure as described on the HIM label or in the ECM/PCM update system.

NOTE: If the ECM/PCM update system requires you to cool the ECM/PCM, follow what is shown on the screen.

8. Do the ECM/PCM idle learn procedure.
9. Do the CKP pattern clear/CKP pattern learn procedure.

How to Substitute the ECM/PCM




1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Make sure the HDS communicates with the ECM/PCM. If it doesn't, go to the DLC circuit troubleshooting. If you are returning from DLC circuit troubleshooting, skip steps 5 and 6, and clean the throttle body after substituting the ECM/PCM
3. Select the INSPECTION MENU with the HDS.
4. Select the TP POSITION CHECK in the ETCS TEST with the HDS.

NOTE: If the result of TP POSITION CHECK was failed, clean the throttle body after this procedure.

5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.




7. Remove the center lower covers (A).
8. Remove the duct (B).
9. Disconnect the ECM/PCM connectors (C).
10. Remove the bolts (D), then remove the ECM/PCM (E).
11. Install a known-good ECM/PCM in the reverse order of removal.
12. Open the SCS line with the HDS.
13. Turn the ignition switch ON (II).

NOTE: For 2005-2006 models: DTC P0630 "VIN Not Programmed or Mismatch" will be stored because the VIN has not been programmed into the ECM/PCM; ignore it, and continue this procedure.

14. Input the VIN to the ECM/PCM with the HDS.
15. Update the ECM/PCM if it does not have the latest software.
16. Rewrite the immobilizer code with the ECM/PCM replacement procedure in the HDS; it allows you to start the engine.
17. Reset the ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure.
19. Do the CKP pattern learn procedure.
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