Originally Posted by
WhiteWidow
Alright guys so i received my scanner today and just finished up doing a scan.
I received 2 fault codes:
P0122 - Throttle Position Sensor A Circuit Low Input
P1504 - Intake Air Control circuit malfunction
I was already guessing that i needed a new TPS but i'm not sure about the IAC circuit problem and how to fix it. I have replaced the IAC twice now.... Could this be caused by the bad TPS and/or the need for new intake gaskets?
Thanks
OK so you did have some codes stored, so lets think about this some more.
Since you have a TPS trouble code & the throttle plate stop screw appears to have been messed with/backed off, it'll need to be reset, so maybe review this link which has instructions for setting the idle stop screw & checking the TPS out.
Fuel Injection Technical Library » Throttle Position Sensor (TPS)
Not sure yet what to make of the P1504 Intake Air Control circuit malfunction. Have you checked/back probed the IAC voltage at its electrical connector??? At KOEO, between the VPWR pin to ground you should have 10.5 volts or more. The IAC should measure 6-10 ohms, with the meters + lead on the VPWR pin & the - lead on the IAC pin. There is a diode in the circuit, so if you get the lead polarity reversed to the meter or the IAC, it'll read different.