How to Update the PCM
How to Update the PCMNOTE:
- To ensure the latest program is installed, update a PCM whenever the PCM is substituted or replaced.
- You cannot update a PCM with the program it already has. It will only accept a new program,
- Before you update the PCM, make sure the vehicle's battery is fully charged.
- To prevent PCM damage, do not operate any electrical system; audio system, brakes, air conditioning, power windows, moonroof, and door locks, 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 HDS or the Honda interface module (HIM) to the DLC (A) located under the left end of the dash.
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 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 PCM is not the latest, do the PCM update procedure as described on the HIM label or in the PCM update system.
NOTE: If the PCM update system requires you to cool the PCM, follow what is shown in the screen.
7. Do the PCM idle learn procedure.
8. Clear the CKP pattern with the HDS while the engine is stopped.