Civic L4-1.8L CNG (2008)
Control Module: Programming and Relearning
How to Update the PCM
Updating the PCM
Special Tools Required
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Honda diagnostic system (HDS) tablet tester
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Honda interface module (HIM) and an iN workstation with HDS and CM update software
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HDS pocket tester
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GNA600 and an iN workstation with HDS and CM update software
NOTE:
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Use this procedure when you need to update the PCM during troubleshooting procedures.
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Make sure HDS/HIM has the latest software version downloaded from the iN (interactive network).
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To ensure the latest program is installed, do a PCM update whenever the PCM is substituted or replaced.
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You cannot update a PCM with the program it already has. It will only accept a new program.
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Before you update the PCM, make sure the battery is fully charged, and connect a jumper battery (not a battery charger) to maintain system
voltage.
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Never turn the ignition switch to LOCK (0) while updating the PCM. If you turn the ignition switch to LOCK (0) before completion, the PCM can
be damaged.
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To prevent PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moon roof (if equipped), door locks,
etc.) during the update.
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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.
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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 to ON (II), but do not start the engine.
2. Connect the HDS to the DLC (A) located behind the driver's dashboard lower cover.
3. Make sure the HDS communicates with the PCM. if it does not, go to the DLC circuit troubleshooting.
4. Select the INSPECTION MENU with the HDS.
5. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts.
NOTE: If the TP POSITION CHECK indicates FAILED, continue this procedure.
6. Exit the HDS, then select the CM update, and follow the screen prompts to update the PCM.
7. If the PCM has the latest software, 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 procedure 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:
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Leave the ignition switch in the "ON (II)" position.
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Connect a jumper battery (do not connect a battery charger).
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Shut down the HDS.
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Disconnect the HDS from the DLC.
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Reboot the HDS.
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Reconnect the HDS to the DLC, and try the update procedure again.