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Where is the PSOM located at on a 1991 E 350 7.3 ?

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Need help troubleshooting cruise control in a 1994 ford explorer 4×4 w 4.0 engine

Hi Mike , what have you check so far ? fuse's , do you have the switches on the steering wheel or the column ? Does the CC light on the dash light up when push the on Button ?
ELECTRONIC SPEED CONTROL SYSTEM Condition Possible Source Action
  • Speed Control Inoperative
  • Blown fuse.
  • Circuitry.
  • Stoplight switch.
  • Burnt stoplamp bulb.
  • Speed control actuator switch.
  • Vehicle speed sensor.
  • Speed control servo.
  • Programmable electronic speedometer/odometer module (PSOM). (Aerostar only).
  • GO to Pinpoint Test A .
Do you have a volt meter an do you know how to test electrical circuits ? I have factory pin point test chart if you can use it !

May 15, 2015 | Ford Cars & Trucks

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Need to replace my PSOM on my 93 Ford f150

Very sorry here not a lot of use am i as a expert on this sort of problem as here in europe 99% of vehicles have manual transmission and a invariably a diesel engine so only thing i can suggest here is to ask a local garage on this one as they will have the experiance of automatic gearboxes and maybe the appropiate software to programme the computer for you ,if this is the problem as because its locking up in reverse i would be inclined to suspect maybe the brake bands are over adjusted as modern gearboxes are all computer controlled compared to the old ones which were fluid pressure controlled in which case it could be a spring broke behind one of the ball bearing seals but this has none of this just a load of solonoids opening the valve controlled by the computer .

Jan 19, 2014 | Cars & Trucks

1 Answer


check with a dealer .many parts are only available thru them

Sep 14, 2017 | Cars & Trucks

1 Answer

93 Ford F150 5.0 with E4OD shifting hard and speedometer not working. Replace the speed censor and no codes are showing. Still same problem. Help??

The vehicle speed sensor (located in the differential) sends a signal to the Programmable Speedometer/Odometer Module (PSOM) and the Antilock Brake System (RABS module or 4WABS module depending on how your truck is equipped)

The Powertrain Control Module (PCM) which controls your transmission, gets its vehicle speed information from the PSOM.
I would need the engine size of your truck and know if it is 4 wheel drive before I could look up actual application charts.
However, You need to be aware that your PCM should ALWAYS output ether code 11 or code 111 if there are no other codes (again depending on how it is equipped) If it does not at least output one of these, then there is an issue with the way you are gathering codes or the PCM is defective.
Also there are three different sections in your PCM for fault codes. ALL of them need to be checked.
> Key On, Engine Off (KOEO) self test (Fix these codes FIRST)
> Key On, Engine Running (KOER) self test (Fix these codes SECOND)
> Continuous Memory codes (Fix these codes only if all other codes are fixed and these return after clearing codes and driving the vehicle)

Jun 01, 2012 | Ford F-150 Cars & Trucks

2 Answers

Cod po501 audi a6 2005

Code P0501 is Vehicle Speed Sensor A Range/Performance.

Dec 16, 2010 | Audi A6 Cars & Trucks

3 Answers

1996 ford f150 blows the 10amp fuse going to the speed odometer.

I'm glad you found what was causing the fuse to blow. A wiring diagram is almost a must when troubleshooting electrical. you may be able to find that sensor at a pick-a-part or wrecking yard. Just be extreamly careful, it is very easy to set off the air bag. Make sure that all power is off before working around that area.

May 25, 2009 | 1996 Ford F150 Regular Cab

2 Answers


Mounted on top of the rear differential housing,facing up and slightly forward is a speed sensor that is common to go bad,this is the Vehicle Speed Sensor (VSS).Replacing it is pretty easy,or it can be tested.There is also a PSOM mounted up under the dash (Programmable Speedometer Odometer Module),and these also are known to go bad.Ideally,a scan tool would be available to look at the VSS reading in the data stream.If the vehicle computer is SEEING a constant and steady vehicle speed signal FROM the VSS,then you know the VSS is functioning properly,and the problem will likely be with the PSOM.If the vehicle computer is NOT seeing a vehicle speed signal from the VSS,then you know it's a bad VSS or the wires to and from it.Good Luck.

Sep 27, 2008 | 1993 Ford F350

1 Answer

Speedometer doesnt work or bounces causing car to studder

On my 96 the PSOM module went bad. That is located on the back of the instrument cluster. Mine is analog not digital. What was happening was that the PSOM (Programable Speedometer Odometer Module) would mess up and the speedometer would jump all over the place. The tranmission is electronic and the computer would adjust and shift depending on the speed reported by the speedometer. The van would **** and shake. At slower speeds it was much better. I changed the speed sensor first without success. Changed the instument cluster and all was well.

Jul 30, 2008 | 1994 Ford Aerostar Extended

1 Answer

Speedometer not working

Check the gear very carefully that goes on the end at the transmission.It is plastic,and retained with a metal spring clip.The plastic can become "applecored" where as it doesnt make contact with the drive teeth on the transmission output shaft.If the gear is in order,the speedo cable operates correctly,and checks out ok,then it is likely a bad speedo head in the dash.Later model Ford trucks all used a PSOM (programmable,speedomoeter,odometer module) that was known to be somewhat problematic,but i think your year Ford is too early to have a PSOM.

Jul 26, 2008 | Ford E-350 Cars & Trucks

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