RELAY CONTROL MODULE 1994 F-150

  • Tiny
  • salgar444
  • 1994 Ford F-150
  • V8
  • 4WD
  • automatic
  • 125,000 miles

1994 f-150 5.0 L, 4x4. My speedo, odometer, went out and my auto transmission started******** hard when shifting into higher gear. I had the same problem 3 years ago and I changed a blown fuse (position 18) and it worked fine.
The same problem showed up 6 months ago, but this time the fuse was not blown. I took it to a mechanic who replaced (he said) the relay control module ( part #F6DF-12B577-AA). Does this sound right, and how do I find the location of the module on the truck and how easy is the repair myself if I get the part? Thank you

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Thursday, July 7th, 2011 AT 4:50 AM

4 Replies

  • Tiny
  • Wrenchtech
  • Expert
  • 20,296 posts

The part number is for a CCRM (Constant Control Relay Module) but I don't believe the F150 even has one and the cars that did, it housed the A/C relay, cooling fan relay and fuel pump relay, all of which this truck has individually.

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Thursday, July 7th, 2011 AT 10:24 AM
  • Tiny
  • salgar444
  • Member

OK. So how would I go about trying to find out what the problem is?

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Thursday, July 7th, 2011 AT 11:31 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,296 posts

Sounds like an issue with the Vehicle Speed Sensor but it needs to be diagnosed properly.

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Thursday, July 7th, 2011 AT 11:33 PM
  • Tiny
  • Wrenchtech
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  • 20,296 posts

I understand you want to troubleshoot the VSS. You will need a lab scope for that.

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Friday, July 8th, 2011 AT 4:43 PM

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