How to Troubleshoot the Fuel and Emissions Systems
Updating the ECM
Special Tools Required
  • Honda diagnostic system (HDS)
  • Honda interface module (HIM)
  • HDS pocket tester
NOTE:
  • Use this procedure when you have to the ECM during troubleshooting procedure.
  • Make sure the HDS/HIM has the latest software version.
  • Before you update the ECM, make sure the battery in the vehicle is fully changed.
  • Never turn the ignition switch OFF during the update. If there is a problem with the update, leave the ignition switch ON (II).
  • To prevent ECM damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, sunroof (if equipped), door locks, etc.) during the update.
  • To ensure the latest program is installed, do an ECM update whenever the ECM is substituted or replaced.
  • You cannot update an ECM with a program it already has. It will only accept a new program.
  • High temperature in the engine compartment might cause the ECM 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.
  • If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) lamp came on or was flashed 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), but do not start the engine.
  1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
  1. Make sure the HDS communicates with the ECM. If it doesn't, go to the DLC circuit troubleshooting.
  1. Exit the HDS diagnostic system, then select the update mode, and follow the screen prompts to update the ECM.
  1. If the software in the ECM 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 ECM is not the latest, follow the instructions on the screen. If prompted to choose the PGM-FI system, make sure you update both.
    NOTE: If the ECM update system requires you to cool the ECM, follow the instructions on screen. If you run into a problem during the update procedure, (programming takes over 15 minutes, status bar goes over 100 %, immobilizer light flashes, HDS tablet freezes, etc.), follow these steps to minimize the chance of damaging the ECM:
    • 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.
  1. Do the ECM idle learn procedure.
  1. Do the CKP pattern learn procedure.