ECM/PCM Updating and Substitution for Testing
ECM/PCM Updating and Substitution for TestingSpecial 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:
- 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/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). 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. Select the INSPECTION MENU with the HDS.
4. Do the TP POSITION CHECK in the ETCS TEST.
5. If the HDS does not have the update function, disconnect the HDS from the vehicle and connect the Honda interface module (HIM).
6. 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 in the screen.
7. Do the ECM/PCM idle learn procedure.
8. Do the CKP pattern clear/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, skip steps 3 to 5 and clean the throttle body 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. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Remove the center lower covers (A).
9. Remove the duct (B).
10. Disconnect ECM/PCM connectors (C).
11. Remove the bolts (D), then remove the ECM/PCM (E).
12. Install a known-good ECM/PCM in the reverse order of removal.
13. Open the SCS with the HDS.
14. Turn the ignition switch ON (II).
NOTE: 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.
15. Input the VIN to the ECM/PCM with the HDS.
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 clear/pattern learn procedure with the HDS.