Updating the PCM
Updating the PCMSpecial Tools Required
^ Honda diagnostic system (HDS)
^ Honda interface module (HIM)
^ HDS pocket tester
NOTE:
^ Use this procedure when you need to update the PCM in a troubleshooting procedures.
^ Make sure you have the latest software on the HDS.
^ To ensure the latest program is installed, do a PCM update 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 battery is fully charged.
^ Do not turn the ignition switch OFF while updating the PCM. If you turn the ignitions switch OFF before completion, the PCM can be damaged.
^ To prevent PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moonroof (if equipped), or 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.
^ High temperature in the engine compartment might cause the 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), but do not start the engine.
2. Connect the HDS to the DLC (A).
3. Make sure the HDS communicates with the PCM. if it does not, go to the DLC circuit troubleshooting.
4. Exit the HDS, then select the CM update, and follow the screen prompts to update the PCM.
5. If the software in the PCM is the latest, disconnect the HDS/HIM from the DLC, and go back to the procedure that you were doing. If the software in the PCM is not the latest, follow the instructions on the screen. If prompted to choose the PGM-FI system or the A/T system, make sure you update both.
NOTE: If the PCM update system requires you to cool the PCM, follow the screen prompts. If you run into a problem (programming takes over 15 minutes, status bar goes over 100%, D or immobilizer indicator flashes, HDS tablet freezes, etc.) during the update procedure, follow these steps to minimize the chance of damaging the PCM:
^ Leave the ignition switch in the "ON (II)" position.
^ Connect a jumper battery (do not connect a battery charger).
^ Shut down the HDS.
^ Disconnect the HDS from the DLC.
^ Reboot the HDS.
^ Reconnect the HDS to the DLC, and try the update procedure again.
6. Do the PCM idle learn procedure.
7. Do the crank pattern clear/crank pattern learn procedure.