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ECM/PCM Updating and Substitution for Testing

PCM Updating and Substitution for Testing

Special Tools Required
Honda interface module (HIM) EQ505A35570

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 have the latest software loaded.

NOTE: Do not turn the ignition switch OFF while updating the PCM. If you turn the ignition switch OFF before completion, the PCM can be damaged.

How to Update the PCM

NOTE:
- To ensure the latest program is installed, do a PCM update whenever the PCM is substituted or replaced.
- You can not 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 anything electrical (audio system, brakes, A/C, power windows, moonroof, 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.
- 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). Do not start the engine




2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Select the INSPECTION MENU with the HDS.
4. Do the TP LEARNING 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.

How to Substitute the PCM

1. Jump the SCS tine with the HDS.
2. Remove the PCM from the vehicle.
3. Install a known-good PCM.
4. Turn the ignition switch ON (it).

NOTE: DTC P0630 "VIN Not Programmed or Mismatch" will be stored because VIN has not been programmed into the PCM, but ignore it and continue this procedure.

5. Input the VIN to the PCM with the HDS.
6. Rewrite the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.
7. After completing your tests, install the original PCM, and rewrite the immobilizer code with the PCM replacement procedure in the HDS.
8. If you substitute a new PCM select the INSPECTION MENU with the HDS, with the original PCM installed.
9. Do the TP LEARNING CHECK in the ETCS TEST.
10. Replace the PCM, and rewrite the immobilizer code with the PCM replacement procedure in the HDS.
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