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Coolant temp sensor issues

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Old Jun 19, 2019 | 07:23 PM
  #11  
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I'll have to check and get back to you I did try re wiring it straight from the plug to the pcm to the sensor it self and got no change. That I tried with the black and tan wire after you and i figured i read diagram backwards and still no signal
 
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Old Jun 19, 2019 | 07:23 PM
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That gauge gets its clue from the PCM, which gets its clue from..... the sensor....... PCM then tells the cluster what to display. Sensor resistance goes down, as temp goes up. So, I suspect that somewhere you have a bad connection, or, a bad sensor. (but, didn't you replace the sensor, and still get the same behavior?) When the circuit fails, the PCM is gonna think the engine is a LOT colder than it really is, and it will positively DUMP gasoline into the cylinders........ Need to find out if you are losing sensor signal back to the PCM, or, losing the 5 volt supply TO the sensor.
 
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Old Jun 19, 2019 | 08:21 PM
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Originally Posted by HeyYou
That gauge gets its clue from the PCM, which gets its clue from..... the sensor....... PCM then tells the cluster what to display. Sensor resistance goes down, as temp goes up. So, I suspect that somewhere you have a bad connection, or, a bad sensor. (but, didn't you replace the sensor, and still get the same behavior?) When the circuit fails, the PCM is gonna think the engine is a LOT colder than it really is, and it will positively DUMP gasoline into the cylinders........ Need to find out if you are losing sensor signal back to the PCM, or, losing the 5 volt supply TO the sensor.
He did replace it but with a generic one, I believe that is where his problem lies
 
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Old Jun 19, 2019 | 08:38 PM
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Not sure but used one of these two sensor from napa auto if that helps with brand issues or if you guys have any suggestions of what brand and where to get from
 
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Old Jun 19, 2019 | 08:40 PM
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Of course I clicked on the same picture but the other was a echline ignition type of sensor I'm would assume to find someone who carrys comman name like Bosch
 
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Old Jun 19, 2019 | 08:42 PM
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You REALLY need a volt/ohm meter......
 
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Old Oct 18, 2022 | 10:45 AM
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I'm having the same issue on my 1998 5.2, I clear the code, it comes right back as soon as I turn the key on, I replaced the ECT sensor, the manifold air intake sensor, the PCM, on the replacement PCM my VIN number was flashed to it, and no luck, still have code P0118, my tag expires this month in 13 days and they won't pass inspection unless I get rid of the check engine light and if it don't pass inspection they won't let me get the tag renewed.
 
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