PCM-BCM Signal Circuit Inspection

NOTE:
- When PCM-BCM signal circuit is malfunction, combination meter indicates the following condition at the same time (H27 engine with A/T model only) Be sure to bear this mind when diagnosing trouble.
- O/D OFF indicator keeps flashing
- POWER indicator turns OFF
- A/T selector position indicator turns OFF

- If O/D OFF indicator, "POWER" indicator and A/T selector position indicator display abnormal condition of PCM-BCM signal circuit described in "Description", perform the following procedure.

1. Check open, short to ground and short to power circuit of PCM-BCM signal circuit wire harness (PNK) between E61-8 and G53-15 terminals.

If OK, go to next step.
If found abnormal condition, repair circuit.

2. Substitute a known-good BCM, and check that related indicator lights come to good conditions.

If found abnormal condition, go to next step.

3. Substitute a known-good PCM, and recheck that the above indicators and warning operate in normal.