ABS / Speedo issue

Michael Mechanic Texas Posted   Latest   Edited  
Unsolved
Drivetrain
1995 Ford F-150 XLT 4.9L (Y) 4-spd (E4OD)

'95 F150 n line 6. Unknown codes

Abs / speedo issues

Hey guys this is my work trk I am working on, it originally had an e4od auto trans in it. I was having the slam, bang shifting issue that seems to be prevalent to this trans model… l tried different “fixes” over the last 2 years to only moderate it somewhat… till recently I lost 3rd & od. A reman cost more than I thought the p/up was worth so I took parts from an old beater and converted it to a 4 speed manual trans. Disconnected the now not needed trans harness and located the park/neutral saftey start circuit and set it up with a clutch pedal switch. So she's a runnin' & driving fine (a tad slow w/o the od), however, the abs warn lite is on and the speedo does not work. I assume there are open circuits re: with the open plugs formerly running to the auto trans that transferred signals re: trans / ecm… anyone have some input as to particular circuits or bypass options? Prior to trans swap there was no abs warn issue and speedo worked perfect.

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Chris Technical Support Specialist
New York
Chris
 

Service information shows PSOM output for vehicle speed. That is generated from the rear wheel speed sensor through the cluster(PSOM) You may have just disturbed the rear wheel speed sensor. You can scope the sensor to test it.

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Sherman Owner
Texas
Sherman
 

Back in those days, you had computers with no programming for an automatic trans if the truck had manual.

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Glenn Owner/Technician
Texas
Glenn
 

Hello Michael, I had this very issue with my 95 F-350 service truck early this year. These have what is known as a “PSOM” (programmable speed odometer module) The speedo could be manually programmed according to the tire size and rear gear ratio combinations. There is no know bypass for this. ABS light will stay on and odometer will likely not read. The PSOM is a small circuit board mounted to…

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Glenn Owner/Technician
Texas
Glenn
 

Next solution is change the ECM to a 4 speed version and verify the rear ABS sensor is working. Or go through the transmission harness and figure out what wires need to be jumpers to trick the ECM. Ultimately, I think it will need the PSOM for everything to function correctly.

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