Pinpoint Test J: Programmable Speedometer/Odometer Module: Description

To prevent 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 Powertrain Control Module (PCM).
• Harness circuits: PSOM(+), PSOM(-).
• Powertrain Control Module (PCM)

PSOM receives input from RABS sensor, which is mounted on rear differential. PSOM sends input signal information to PCM.

Fig 1: Programmable Speedometer/Odometer Module Schematic

Courtesy of FORD MOTOR CO.

Fig 2: Programmable Speedometer/Odometer Module Test Location

Courtesy of FORD MOTOR CO.