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Cavalier Starting in the 1980s. the Cavalier made a name for itself by offering an affordable 2 and 4 door compact.
Platform: J-body

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  #11  
Old 07-15-2012, 10:36 PM
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Would tearing the wiring harness apart be worthwhile to trace those 2 wires all the way back? I think its pretty unlikely that the wires themself are the problems though.

I guess its possible for air to be in the system. I just put a new cylinder head on and filled the system back up.
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  #12  
Old 07-16-2012, 06:52 AM
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How is the shotgun approach working for ya...replace without testing. Its your $65 plus programming costs. good luck with that.

If it was me, I would verify the wiring is ok first. The wiring is 15 years old. Its a 10 minute test.

Last edited by tech2; 07-16-2012 at 06:55 AM.
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  #13  
Old 07-16-2012, 06:52 PM
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jumper the wires together at the switch, then key on. If that induces a po117 all the wiring and pcm is ok. If you can't induce a p0117 but have 5volts on the yellow wire the grd wire is open.

all the head gasket stuff...air in the system etc won't induce a p0118. 117/118 are all logic tests for the pcm and wiring.
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  #14  
Old 07-16-2012, 08:08 PM
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I will test for 5 volts on the yellow wire with the key on tonight. What do you mean jump wires together at the switch? What switch? Sorry I am not following what you mean.
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  #15  
Old 07-16-2012, 08:12 PM
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sorry, jump the terminals together at the ect sensor connector. so yellow and brown wires

Last edited by tech2; 07-16-2012 at 08:14 PM.
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  #16  
Old 07-16-2012, 09:30 PM
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Got 5 volts on the yellow wire. I put a paper clip in the plug as a jumper and started the car. No p0117 and the temp gage did the exact same thing.
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  #17  
Old 07-16-2012, 10:27 PM
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Quote:
Originally Posted by 98JunkCav View Post
Got 5 volts on the yellow wire. I put a paper clip in the plug as a jumper and started the car. No p0117 and the temp gage did the exact same thing.
Well, I guess tech2 is correct. If you jumpered full voltage to the switch leg, and if it were a complete circuit, you should have pegged the temp guage. I'd first before tearing the wire harness apart, is to use an electrical cleaner, and spray the connections well.
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  #18  
Old 07-16-2012, 10:37 PM
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I'll tear into the wiring harness tomorrow night. Sounds like its more than likely the ecm though. Whats it take to fix that? If that doesnt work I am done with this damn car.
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  #19  
Old 07-17-2012, 07:05 AM
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why why why do you still think its ecm? the ecm reads its voltage signal from the 5volt ref side of the circuit not the grd side.
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  #20  
Old 07-17-2012, 08:28 AM
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Obviously I dont no lol. Where does the ground side go then?
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Old 07-17-2012, 08:28 AM
 
 
 
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Tags
96, brown, cavalier, chevy, coolant, cooling, flush, gauge, lumina, messed, messing, pegging, sensor, temp, trace, wire, wiring


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