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Updating the ECM/PCM

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 already 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, 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, 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.

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




2. Connect the HDS or Honda Interface Module (HIM) to the Data Link Connector (DLC) (A) located under the driver's side of dashboard.
3. Do the ECM/PCM update procedure as described on the HIM label and in the ECM/PCM update system.
4. Do the ECM/PCM idle learn procedure.
5. Do the CKP pattern learn procedure, if you did the trouble shooting for DTC P0300, P0301, P0302, P0303, P0304, P0335, or P0339.

How to Substitute the ECM/PCM

1. Remove the ECM/PCM from the vehicle.
2. Install a known-good ECM/PCM in the vehicle.
3. Rewrite the immobilizer code with the ECM/PCM replacement procedure from the Honda PGM Tester or the HDS; It allows you to start the engine.
4. After completing your tests, reinstall the original ECM/PCM and rewrite the immobilizer code with the ECM/PCM replacement procedure on the Honda PGM Tester or the HDS.
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