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ECM/PCM Updating and Substitution for Testing

ECM Updating and Substitution for Testing- 2002-2005 M/T models and CVT model

Special Tools Required
Honda interface module (HIM) EQS05A35570

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

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

How to Update the ECM

NOTE:
- To ensure the latest program is installed, do an ECM update whenever the ECM is substituted or replaced.
- You can not update an ECM with the program it already has. It will only accept a new program.
- Before you update the ECM, make sure the vehicle's battery is fully charged.
- To prevent ECM damage, do not operate anything electrical (audio system, brakes, NC, power windows, 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 damage.

1. Turn the ignition switch ON (II). Do not start the engine.




2. Connect the HDS or the Honda interface module (HIM) to the data link connector (DLC) (A) located under the driver's side of dashboard.
3. Do the ECM update procedure as described on the HIM label and in the ECM update system.
4. Do the ECM idle learn procedure.

How to Substitute or Replace the ECM

1. Turn the ignition switch OFF.
2. Wait 1 minute. If the radiator fan is running, wait 1 minute after the radiator fan stops.
3. Disconnect the negative cable from the battery.




4. Pull the passenger's side carpet back to expose the ECM (A).
5. Remove the ECM cover (B).
6. Lift the lower edge of the ECM cover off of the lower studs. Make sure the ECM is not touching the studs.
7. Lift the upper edge of the ECM cover enough to clear the upper studs, then pull the cover down away from the evaporator drain tube.
8. Remove the ECM from the cover.
9. Disconnect the ECM connectors.
10. Install the ECM in the reverse order of removal.
11. Turn the ignition switch ON (II).

NOTE: For 2005 model: DTC P0630 "VIN Not Programmed or Mismatch" will be stored because the VIN has not been programmed into the ECM. Ignore it and continue this procedure.

12. For 2005 model: Input the VIN to the ECM with the HDS.
13. Rewrite the immobilizer code with the ECM replacement procedure in the HDS; it allows you to start the engine.
14. Do the ECM idle learn procedure.
15. Remove the No.15 (40 A) fuse from the under-hood fuse/relay box.
16. If the IMA battery level gauge (BAT) displays no segments, start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in Park or neutral) until the BAT displays at least three segments.
17. Reinstall the No.15 (40 A) fuse.
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