scanner communication problem
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Tuned
Joined: Apr 2006
Posts: 331
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From: grorgetown,in
scanner communication problem
i got a 03 with 112k miles. friend brought it to me cause it is taking about twice as long to start that it should. i went to to hook my ford telestar scanner to it and it unable to verify connection. i had a friend bring his snap-on scanner over and it does the same thing. it has power to it so fuse is good. i tried swaping a new pcm,idm,ebp.icp,ipr and still no luck. luckily i got all those extra parts laying around. i cleaned every ground i could find also. i then unhooked the wiring harness on top of valve cover and still no luck. im about to go crazy wondering why the scanners wont read pcm. any ideas would be great. ill try anything at this point.
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From: Hoschton,GA
Double check the wires to the OBD II have not been cut.
Diane
Diane
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Thread Starter
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Tuned
Joined: Apr 2006
Posts: 331
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From: grorgetown,in
Ok the 4v pin only has 2.56v. The 5v has 1.6v. Hmm now what? Checked batteries and they are up. The battery pins show 12.2 volts the grd pins are good. Did some playing and i can check abs with scanner. I got a good one here. Lol
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From: Puget Sound
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Tuned
Joined: Apr 2006
Posts: 331
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From: grorgetown,in
ok here is something to think about. the pin that should have 5 volts has 1.6 at all times. with key off its steady 1.6. you turn key on it has 1.6 but jumps around like to 1.4 1.5 1.6, all over the place. this thing is driving me crazy.
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From: Puget Sound
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Tuned
Joined: Apr 2006
Posts: 331
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From: grorgetown,in
Checked two other trucks on pin#10 and they have 5v with key on then ground with key off. Just found out also truck has been wrecked in right front. Be nice people tell you this up front. So maybe bidy shop goofed a wire up.
Post Fiend
Joined: May 2009
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From: Pea Ridge, AR
With the voltage being present and not going to full ground(low) I would really inspect the wiring to the PCM as well as the grounds. Known chafe points would be around the shock tower, and the DS valve cover and lifting eye area.
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Tuned
Joined: Apr 2006
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From: grorgetown,in
well i might be onto something. the main 60 amp fuse in fuse block, when i push in on it with very little pressure pin goes to 6 volts. let off of it, it goes back to the 1.6 volts. going to take block apart and see whats going on. will check back later.