Quote:
Originally Posted by Waffle
http://ls1tech.com/forums/pcm-diagno...uit-input.html
Read this link for some info and it talks about some details with the iat. Remember that last sensor you had that was grounded to chassis and not to the pcm? Maybe thats the case here or maybe a wire is open somewhere. Anyway, it talks about proper volt and ohm readings for the iat.
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The MAF was the sensor that I grounded the signal from the PCM. It was black so I tied it in with the others.
Quote:
Originally Posted by blazerbrad
Sounds like you ruled out the IAT sensor itself and generally if the circuit is shorted or open you will get an extreme signal one way or the other (like -30 or 300).
Next step is to verify the reference signal. Should be getting a 5 volt signal to the sensor. The PCM supplies both the 5 V and the ground.
Not sure about the wire size causing the issue. If the IAT is reading too low that should correspond to a higher resistance, and I would expect the larger wire to have a lower resistance. Wouldn't be surprised if you are getting straight battery voltage as I think that this increase in voltage compared to the desired 5V would cause an increase in resistance that corresponds to the temp reading you are getting.
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I will check the voltage tonight.