Test Notes

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

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 (PSOM) module output to the Powertrain Control Module (PCM)
- Harness circuits: PSOM(+) PSOM(-)
- PCM

PSOM And Related Components:

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

Test Schematic:

DTC DESCRIPTION
0500 = Vehicle speed sensor malfunction.