PCM Updating and Substitution For Testing

PCM Updating and Substitution for Testing

Special Tools Required
Honda Interface Module (HIM) P/N EQS05A35570

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

NOTE: Do not turn the ignition switch OFF while updating; the PCM can be damaged.

How to Update the PCM

NOTE:
- To ensure the latest program is installed, do an PCM update whenever the PCM is substituted or replaced.
- Before you update the PCM, make sure the vehicle's battery is fully charged.
- To prevent PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moon roof, 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 PCM damage.

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




2. Connect the HIM to the DLC (A) located under the driver's side of dashboard.
3. Do the PCM update procedure as described on the HIM label and in the PCM update system. If the software in the PCM is the latest version, replace the PCM.

How to End a Troubleshooting Session

This procedure must be done after any troubleshooting.

1. Clear the DTC(s) with the Scan Tool or HDS, or reset the PCM by removing the No. 6 (PCM) fuse in the under-hood fuse/relay box for more than 10 seconds.
2. Turn the ignition switch ON (II).
3. Start the engine in the P or N position, and warm it up to normal operating temperature (the radiator fans come on).
4. To verify that the problem is repaired, test-drive the vehicle for several minutes at speeds over 30 mph (50 km/h) or in freeze data range.