ECM/PCM Updating and Substitution For Testing

Known-Good PCM Substitution
Use the following procedure if you need a known-good PCM to test a vehicle. It allows you to swap an PCM from a "donor" vehicle without having to program it to the test vehicle's ignition key.

1. Cut a temporary ignition key for the test vehicle with a non-immobilizer key blank.
2. Remove the PCM from the test vehicle.
3. Write the test vehicle's VIN on the PCM you just removed to avoid confusing it with the donor vehicle's PCM.
4. Remove the known-good PCM from the donor vehicle, and install it in the test vehicle.




5. Tape the donor vehicle's ignition key head-to-head to the test vehicle's temporary key. The PCM will recognize the code from the donor vehicle's key and allow you to start the engine with the temporary key.
6. After completing your tests, reinstall both PCM's, and destroy the temporary key.




If the inspection for a particular code requires voltage or resistance checks at the PCM connectors, remove the right door sill molding. Pull the carpet back to expose the PCM. Unbolt the PCM cover, and connect the backprobe sets and a digital multimeter as described below. Check the system according to the procedure described for the appropriate code(s) listed.




How to Use the Backprobe Sets
Connect the backprobe adapters to the stacking patch cords, and connect the cords to a multimeter. Using the wire insulation as a guide for the contoured tip of the backprobe adapter, gently slide the tip into the connector from the wire side until it comes in contact with terminal end of the wire.






CAUTION:
- Puncturing the insulation on a wire can cause poor or intermittent electrical connections.
- Bring the tester probe into contact with the terminal from the terminal side of wire harness connectors in the engine compartment. For female connectors, lust touch lightly with the tester probe and do not insert the probe.

Powertrain Control Module (PCM) Reset Procedure

NOTE: The PCM memory setting is needed after resetting the PCM.

Either of the following actions will reset the PCM.
- Use the OBD II scan tool or Honda PGM Tester to clear the PCM's memory.

NOTE: See the OBD II scan tool or Honda PGM Tester user's manuals for specific operating instructions.




- Turn the ignition switch OFF. Remove the BACK UP RADIO (7.5 A) fuse from the under-hood fuse/relay box for 10 seconds.

NOTE: If the BACK UP RADIO (7.5 A) fuse is removed and the ignition switch ON (II), MIL will report on and PCM will store the DTC P0560.