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Coolant, temp gage problem HELP!


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98JunkCav's Avatar
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July 15th, 2012, 9:36 PM   #11  
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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July 16th, 2012, 5:52 AM   #12  
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; July 16th, 2012 at 5:55 AM.
 
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July 16th, 2012, 5:52 PM   #13  
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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July 16th, 2012, 7:08 PM   #14  
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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July 16th, 2012, 7:12 PM   #15  
sorry, jump the terminals together at the ect sensor connector. so yellow and brown wires


Last edited by tech2; July 16th, 2012 at 7:14 PM.
 
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July 16th, 2012, 8:30 PM   #16  
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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July 16th, 2012, 9:27 PM   #17  
Posted By: 98JunkCav 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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July 16th, 2012, 9:37 PM   #18  
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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July 17th, 2012, 6:05 AM   #19  
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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July 17th, 2012, 7:28 AM   #20  
Obviously I dont no lol. Where does the ground side go then?

 
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