HELP needed on MAP test
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Freshman User
Joined: Jul 2000
Posts: 42
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HELP needed on MAP test
I tested the MAP on my '87 Ford, F250, I-6, using the procedures in the Haynes Manual. The signal wire to ground gave me a constant 2.5 volts with no variation when I applied vacuum. Conclusion was that the MAP was bad. I get a new MAP and test it. I get the same results: no change in signal voltage with a change in vacuum. I then checked two more MAPS on two other older Fords, and I got exactly the same results. What's going on? The manual says the signal voltage should vary with vacuum. I feel sure that I have the correct wires hooked up.
Can anybody help out here? I would really appreciate it.
Thanks,
Meck
Can anybody help out here? I would really appreciate it.
Thanks,
Meck
Senior User
Joined: Jan 2000
Posts: 242
Likes: 0
From: St. Paul, MN
HELP needed on MAP test
I don't think it's the voltage that changes on a MAP sensor- it's the frequency that changes. You need to test a MAP sensor using an oscilloscope.
Dustin Siebert
1988 Bronco XLT
460EFI/C6/BW1356/
D44IFS with 8 lugs(open)/10.25 FF(Lockright locker)/4.56
8" susp/2" body
35's-street/38.5's-trails
[link:www.superford.org/registry/index.php?vID=45|http://www.superford.org/registry/index.php?vID=45]
Dustin Siebert
1988 Bronco XLT
460EFI/C6/BW1356/
D44IFS with 8 lugs(open)/10.25 FF(Lockright locker)/4.56
8" susp/2" body
35's-street/38.5's-trails
[link:www.superford.org/registry/index.php?vID=45|http://www.superford.org/registry/index.php?vID=45]
