Updating the ECM/PCM
PCM Updating and Substitution for TestingSpecial Tools Required
Honda interface module (HIM) EQS05A35570
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.
1. Turn the ignition switch ON (II). Do not start the engine.
2. Connect the HDS or the Honda interface module (HIM) to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Do the PCM update procedure as described on the HIM label and in the PCM update system.
4. Check for DTCs with the HDS. If DTC U0300 is indicated, go to troubleshooting U0300, then back to "PCM Updating". If DTC is not indicated, go to step 5.
5. Do the PCM idle learn procedure.
6. Do the CKP pattern clear/pattern learn procedure.
How to Substitute the PCM
1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. Turn the ignition switch OFF,
4. Jump the SCS line with the HDS.
5. Remove the center lower cover (A).
6. Remove the duct (B).
7. Disconnect the PCM connectors (C).
8. Remove the bolts (D), then remove the PCM (E).
9. Install the PCM in the reverse order of removal.
10. Open the SCS with the HDS.
11. Turn the ignition switch ON (II).
NOTE: DTC P0630 "VIN Not Programmed or Mismatch" will be stored at this time because VIN has not been programmed into the PCM, but ignore it and continue this procedure.
12. Input the VIN to the PCM with the HDS.
13. Rewrite the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure.
16. Do the CKP pattern learn procedure.