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Ref signal for CMP sensor on 5 liter Mountaineer

Tiny
TIREKING
  • MEMBER
  • FORD
I have a 1999 mountaineer with 100k on it. There should be a 5 volt ref at thte gray/red wire at the cmp sensor which comes out of pin 85 on the pcm. I have nothing there and was wondering if it is common for a wire break under the plenum or somewhere in the harness back to the pcm. Obd2 code triggered is p0340

I'm making a donation but I'd rather pay 50 bucks for the guy who finds my problem!
jay fortini
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Monday, January 8th, 2007 AT 5:20 PM

2 Replies

Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
LOL jay.$50!
Its very possible for a wire to chafe or break. And bear in mind also that the 5 volt signal is provided by the pcm so. Hate to say it, have seen a few fail internally. Lets hope its just the wire! Let us know!

Chris
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Tuesday, January 9th, 2007 AT 10:36 AM
Tiny
TAURUSWHEEL
  • MECHANIC
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Do you have a two pin connector or three pin?
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Tuesday, January 9th, 2007 AT 5:33 PM

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