4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

EVAP Questions

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Old 03-13-2013, 07:42 PM
  #21  
art02gt
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hmmmmm..... you said you read 12 v on the signal ground with the car off? that doesn't sound right. maybe more of a pcm problem.
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Old 03-14-2013, 07:08 AM
  #22  
Dooney
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See I had questioned a PCM problem. But here is my issue with that. If the PCM was going bad wouldn't there be more things going wrong than just not being able to read the MAF?

As for reading the 12v on the signal ground with the car off here is what I'm thinking about that. Wouldn't it make sense that I see voltage from the PCM when the car is off because it holds the memory of the car?
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Old 03-14-2013, 10:08 AM
  #23  
art02gt
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No, the pcm grounds that circuit when the key is turned on. This is the part where you start being real careful. It might be worth to take it to a good electrical shop. And the pcm can fail in retarted ways, it doesnt always affect other things. The fuse is ok?
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Old 03-14-2013, 10:12 AM
  #24  
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I checked the main Maxi fuse for it in the under hood relay box and it was fine
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Old 03-14-2013, 11:20 AM
  #25  
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I was really trying to avoid taking it to a shop because the only thing close is a dealership and they are going to charge an arm and a leg just to look at it. But it looks like that may be what I have to do
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