Sunday, February 26, 2012

Speedometer not working on 1993 Ford F350?

That one most likely is the sensor in the rear axle housing. is the abs yellow light on? If it is it is def that sensor. If it is not on check the plug on the housing and if that looks good a would put a sensor in it. they are around 15-20 bucks I have done a boat load of these too.


Turn ignition off. Remove PCM 60-pin connector. Inspect terminals, and repair if damaged. Install Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between test pins No. 3 and 6 at breakout box. If reading is 21-55 k/ohms, go to step 4). If resistance is not 21-55 k/ohms, go to next step.
Check PSOM Circuit Continuity Ensure ignition is off. Disconnect PSOM wiring harness connector. Measure resistance between test pin No. 3 at breakout box and PSOM (+) circuit at PSOM wiring harness connector. Measure resistance between test pin No. 6 at breakout box and PSOM (-) circuit at PSOM wiring harness connector. If resistance is more than 5 ohms, repair open circuit and repeat QUICK TEST. If resistance is 5 ohms or less, go to next step.
Check PSOM Circuit For Open Ensure ignition is off. Measure resistance between test pin No. 3 and test pins No. 6, 37 and 40 at breakout box. If resistance is 10 k/ohms or less, repair open circuit and repeat QUICK TEST. If resistance is more than 10 k/ohms, go to next step.
Check RABS Sensor Resistance Turn ignition off. Remove RABS connector. See Fig. 19. Measure resistance between connector terminals, If resistance is not 1300-1550 ohms, replace RABS and repeat QUICK TEST. If resistance is 1300-1550, go to next step.
Check PSOM Output Voltage Turn ignition off. Connect PCM to breakout box. Connect wiring harness connector to PSOM. Set DVOM on 20-volt AC scale. Start engine, and warm to normal operating temperature. Using an assistant, measure voltage between test pins No. 3 and 6 while gradually increasing vehicle speed to 50 MPH. If maximum voltage is less than 4 volts, fault is in instrument cluster. If maximum voltage received is more than 4 volts, replace PCM.

See the diagram shown below :---

graphic

This will help.
Thanks.

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