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.
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HOMESERVICE MANUALSFORD1994F 250 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSDS - PROGRAMMABLE SPEEDOMETER/ODOMETER MODULEDS - TESTING NOTES
1994 Ford F 250 2WD Pickup L6-300 4.9L
DS - Testing Notes
1994 Ford F 250 2WD Pickup L6-300 4.9LSECTION DS - Testing Notes
Programmable Speedometer Odometer Module (PSOM) Circuit:
DESCRIPTION
The Programmable Speedometer/Odometer Module (PSOM) receives input from the Rear Anti-Lock Brake Sensor (RABS) mounted on the rear axle differential. The PSOM sends this input signal information to the Speed Control module and the Powertrain Control Module (PCM).
NOTE
You should enter this Pinpoint Test only when you have been directed here from Diagnostic Routines
REMEMBER
To prevent the replacement of good components, the following non-Electronic Engine Controls (EEC) areas may be at fault:
- Vehicle speed control system
- Rear anti-lock brake system
- Ring gear inside differential
- Instrumentation system
This Pinpoint Test is intended to diagnose the following
- PSOM output to the PCM
- Harness circuits: PSOM(+) PSOM(-)
- PCM
RENDER: 1.0x
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.