Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test J: Programmable Speedometer/Odometer Module: Description
PSOM receives input from Rear Anti-Lock Brake System (RABS) sensor, which is mounted on rear differential. PSOM sends this input signal information to PCM. DTC 0500 indicates Vehicle Speed Sensor (VSS) malfunction.
Perform this test when directed here by QUICK TEST. This PINPOINT TEST is intended to diagnose:
- PSOM output to PCM.
- PSOM (+) and PSOM (-) wiring harness circuits.
- Powertrain Control Module (PCM).
To prevent replacement of good components, be aware following non-EEC related areas and components may be cause of problem:
- Cruise control system.
- Fault in RABS.
- Ring gear inside differential.
- Instrumentation system.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.