Test Notes

You should enter this pinpoint test only when you have been directed here from symptom flow charts.

To prevent the replacement of good components, the following areas may be of concern:
- vehicle speed control system
- Rear Anti-Lock Brake System (RABS)
- ring gear inside differential
- instrumentation system

This pinpoint test is intended to diagnose the following:
- Programmable Speedometer/Odometer Module (PSOM) output to the Powertrain Control Module (PCM)
- harness circuits: PSOM(+) PSOM(-)
- PCM





DESCRIPTION
The PSOM receives input from the Rear Anti-lock Brake (RABS) sensor, which is mounted on the rear axle differential. The PSOM takes this input signal information to PCM.