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.
1993 Ford E 350 Van V8-7.3L DSLFACTORY OEM SERVICE PROCEDURE
DS - Testing Notes
NOTE: You should enter this Pinpoint Test only when you have been directed here from Quick Test.
REMEMBER
To prevent the replacement of good components, be aware that the following non-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 only the following:
- PSOM output to the processor
- Harness circuits: PSOM(+), PSOM(-)
- Processor assembly
DESCRIPTION
The Programmable Speedometer/Odometer (PSOM) receives inputs from the Rear Anti-Lock Brake System (RABS) Speed Sensor, which is mounted on the rear axle differential. The PSOM takes the input signal information to the Speed Control module and the EEC-IV processor.
REMEMBER
To prevent the replacement of good components, be aware that the following non-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 only the following:
- PSOM output to the processor
- Harness circuits: PSOM(+), PSOM(-)
- Processor assembly
DESCRIPTION
The Programmable Speedometer/Odometer (PSOM) receives inputs from the Rear Anti-Lock Brake System (RABS) Speed Sensor, which is mounted on the rear axle differential. The PSOM takes the input signal information to the Speed Control module and the EEC-IV processor.
Factory Service Tools
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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.
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