Speedometer problem again !!!
Postmaster
Joined: Sep 2003
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From: Southern California
Click on the "new topic" button
Also, if the black cover is missing, time to look for one from the junk yard. The fuse numbers are on that cover. They may also be in the owner's manual, but I'm not sure.
Of course, you can also replace all the 15A and 10A fuses
Also, if the black cover is missing, time to look for one from the junk yard. The fuse numbers are on that cover. They may also be in the owner's manual, but I'm not sure.
Of course, you can also replace all the 15A and 10A fuses
Last edited by copper_90680; May 1, 2007 at 12:56 PM.
New User
Joined: May 2007
Posts: 22
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Aerostar fuses--speedo probs
Replaced all fuses in fusebox under dash, but no help. The digital odometer is completely blank....don't see how sensor would affect that??? Might there be another way to check to see if 12 volts is getting to the circuit??? Another fuse anywhere??? Any way to check speedometer module itself??? My thinking leads to electrical problem (lack of voltage) or the module itself. Anyone have any thoughts??? Thanx!
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
check the DSS differential speed sensor, electrical connector and cable wiring on top hump of rear end....magnetic sensor that sends pulsed signal to PSOM speedo odo. based on magnetic pickup from steel cog ring on ring gear
sensor fails, connector corroded, broken shorted wiring or damaged broken cog ring
pull plug on RABSII black module on bottom of dash above center hump...checks for shorts in unit
drive and test speedo
sensor fails, connector corroded, broken shorted wiring or damaged broken cog ring
pull plug on RABSII black module on bottom of dash above center hump...checks for shorts in unit
drive and test speedo
New User
Joined: May 2007
Posts: 22
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Roger on all that, but would that affect the odometer reading even at stop while idling?? I assume sensor is pulsing signals when vehicle is moving--but NOT while stopped??? How could it affect the digital odometer reading (NOT) while stopped??? Because the odometer is not reading at all (stopped or in motion), I am led to think it is electrical (voltage or module).....not the sensor in differential. Your thoughts please??? Thanx for your help!!
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
electrical short in sensor, wiring or connector or in RABSII control unit
check for 12v with key on on pin 1 Batt. Lt Grn/Y wire and pin 3 Run Pink/Blk wire PSOM module instrument cluster
you need to get a Ford EVTM Service manual
http://www.fordcds.com/ in Ford trucks section for year
or ebay
check for 12v with key on on pin 1 Batt. Lt Grn/Y wire and pin 3 Run Pink/Blk wire PSOM module instrument cluster
you need to get a Ford EVTM Service manual
http://www.fordcds.com/ in Ford trucks section for year
or ebay
New User
Joined: May 2007
Posts: 22
Likes: 0
Aerostar odometer, speedo, cruise and overdrive
Where exactly are those points to check voltage again??? Not familiar with the terminology of the black box??? Thanx for this info.....sounds like it might be promising.....still think it is electrical because NO odometer signifies that the sensor on differntial is not a problem (nor it's wiring???). My mind thinks that the odometer failing to show mileage, indicates no voltage to it or module??? "PSOM"???? "EVTM"???
Last edited by bradlow; May 1, 2007 at 08:38 PM. Reason: Adding PSOM & EVTM for clarification
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