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Speedometer / Transmission Fuse Blowing
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Power Tech
Novice
Oct 24, 2009, 6:15 AM
Post #1 of 10
(2009 views)
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Speedometer / Transmission Fuse Blowing
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Hi everyone,
I have a 02 Express Chevy Van, w/350 engin.
I went on a dirt road (not bad) and blew the Transmission / Speedometer.
I installed another fuse and it lasted for 3 months until I hit a pothole and it blew again.
This has went on until I could only drive a few miles.
My mechanic is stumped. I live in a rural area, any help is appreciated.
Thanks in advance.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 24, 2009, 6:21 AM
Post #2 of 10
(2006 views)
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Re: Speedometer / Transmission Fuse Blowing
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There is no magic answer for find short circuits. It just takes careful examination of the circuit and wiring. Look for any wires caught, jammed or chaffing anywhere. It could end up being a module, solenoid or sensor also.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Power Tech
Novice
Oct 24, 2009, 6:32 AM
Post #3 of 10
(2002 views)
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Re: Speedometer / Transmission Fuse Blowing
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Thanks for the reply Hammer Time, I kinda thought it was a search and destroy mission.
I was hopping it was a common problem.
I am an electrician, and do have a tone generator. I'm lost when it comes to auto wiring though.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 24, 2009, 7:06 AM
Post #4 of 10
(1997 views)
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Re: Speedometer / Transmission Fuse Blowing
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If you can give me a box location and fuse number, I'll try to find you wiring diagram of the circuit. The biggest problem here is that when a fuse powers a module, any module, that module in turn powers other things that could actually be the cause and they won'r show on the fuse circuit.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Power Tech
Novice
Oct 24, 2009, 7:18 AM
Post #5 of 10
(1991 views)
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Re: Speedometer / Transmission Fuse Blowing
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Not sure what number.
It is a 10 amp inside fuse block driver side floor. If you are facing the block, it is the 2nd one "up from the bottom" on the far right.
Thanks.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 24, 2009, 8:33 AM
Post #6 of 10
(1986 views)
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Re: Speedometer / Transmission Fuse Blowing
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Sounds like your looking at the fuse box upside down. That would be fuse #20
Instrument cluster
PCM
Transmission
That's about all the diagram reveals. Anything that any of these modules powers could be the problem. Good luck with this one. Unless you can physically see something, this is going to be hell.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Power Tech
Novice
Oct 25, 2009, 6:34 AM
Post #7 of 10
(1969 views)
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Re: Speedometer / Transmission Fuse Blowing
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Just an update; Got the van back frome the mechanic. He found nothing.
I hooked up my tone generator and yep, it goes to the PCM and to the trans speed sensor.
It also goes into the instrument cluster, which I have heard a lot of bad things.
I am an industrial electrician and have rewired large machines and conveyor systems with 1000's of terminations. I never realized how many wires were in the new vehicles.
Great place they put the PCM, right under the break resevore. I wonder how good the unit is sealed.
Judging by the paint missing under the PCM from getting breaks changed, it has been drenched in hydraulic fluid.
Thanks for the leads. If I find it I will post the results.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 25, 2009, 7:17 AM
Post #8 of 10
(1966 views)
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Re: Speedometer / Transmission Fuse Blowing
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Hahaha..........
Welcome to our world
Here are the pinout diagrams for the PCM if it helps you
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Power Tech
Novice
Oct 25, 2009, 8:02 AM
Post #9 of 10
(1960 views)
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Re: Speedometer / Transmission Fuse Blowing
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Thanks, I think I will need that.
If I can't find the problem It may be Hammer Time for this thing.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 25, 2009, 8:08 AM
Post #10 of 10
(1957 views)
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Re: Speedometer / Transmission Fuse Blowing
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There are some specialty auto electric shops around that are pretty good with that stuff. You may have to resort to them.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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