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Old 01-27-2011, 08:17 PM   #1
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Default PO118 engine coolant temp sensor problem

Car started throwing this code, I looked it up in the manual, I replaced the temp sensor, with a new one from GM. It is the 3 pin sensor, 5 volt Signal wire from the PCM ( I tested and have the 5 volts) then a ground wire, then one going to the gauge. With the new sensor I am still getting this fault. I clear it with my scanner but pops right back. I removed the clip and the PCM connectors, I OHMed the signal wire back No problem, I ohmed the ground wire back, No problem, I ohmed the PCM ground wire to the ground on the car, and its fine. I ohmed the sensor clip ground wire to a ground and its good,, Any Ideas on what can be causing this fault?
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1998 white T/A callies stuffed 383 (built by ME), prc heads, ported fast 92, EPS cam,morels,and the rest of the goodies,pushed by a QTP ford 9" Jakes performance 4l80 with transbrake and tcs billet converter.

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Old 01-28-2011, 10:33 PM   #2
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Default

still bangin my head fellas..........
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1998 white T/A callies stuffed 383 (built by ME), prc heads, ported fast 92, EPS cam,morels,and the rest of the goodies,pushed by a QTP ford 9" Jakes performance 4l80 with transbrake and tcs billet converter.

Never save anything for a special day, THIS day the Lord has given IS special.
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Old 01-29-2011, 09:04 PM   #3
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Default Problem solved

To any interested,,, I went and bought another sensor, I put it in, same damn thing..So I Just plugged the first sensor I bought in and left it hanging, and everything was fine scan tool showing correct ambient temp, Then I plugged back into my second sensor, and fault showed back up, scan tool showing -39 which is the default. SO I had an idea. I pulled and twisted in the clip that was plugged into the sensor, and there you go, the fault was gone and engine showing 191 degree temp, all is fine. So the problem was actually in the clip, I gues when I plugged it in it has the problem, but unplugged no problem, thats why all the test I did with my multimeter passed. Problem is the damn clip..Solved.
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1998 white T/A callies stuffed 383 (built by ME), prc heads, ported fast 92, EPS cam,morels,and the rest of the goodies,pushed by a QTP ford 9" Jakes performance 4l80 with transbrake and tcs billet converter.

Never save anything for a special day, THIS day the Lord has given IS special.
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Old 01-29-2011, 09:04 PM
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