Fuel & Emissions System: Diagnosis Honda Pilot I

If You Can't Duplicate The DTC

Some of the troubleshooting requires you to reset the PCM and try to duplicate the DTC. If the problem is intermittent and you can't duplicate the DTC, do not continue through the procedure. To do so will only result in confusion and, possibly, a needlessly replaced PCM.

How To End A Troubleshooting Session (Required After Any Troubleshooting)

1. Reset the PCM as described above. See «How To Reset The PCM»(ref-173995-S09390407622005041500000) .
2. Turn the ignition switch OFF.
3. Disconnect the HDS or the scan tool from the DLC.

Note. The PCM is part of the immobilizer system. If you replace the PCM, it will have a different immobilizer code. In order for the engine to start, you must rewrite the immobilizer code with the HDS.

How To Remove The PCM For Testing

If the inspection for a trouble code requires voltage or resistance checks at the PCM connectors, remove the PCM and test it

Scheme 2

1. Remove the passenger's center console side trim (A).
2. Remove the two nuts from the bracket (B).
3. Remove the bolt and the nut from the PCM (C).

How To Substitute The PCM For Testing

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

Scheme 3

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 (A). The PCM will recognize the code from the donor vehicle's key (B) and allow you to start the engine with the temporary key.
6. After completing your tests, reinstall both PCMs, and destroy the temporary key.

Scheme 4

Scheme 5

Scheme 6

Symptom Troubleshooting Index

These symptoms DO NOT trigger diagnostic trouble codes (DTCs) and cause the malfunction indicator lamp (MIL) to come on. If the MIL is reported on, check for DTCs. If the vehicle has one of these symptoms, do the diagnostic procedure for it, in the sequence listed, until you find the cause.

Scheme 7