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  1. Thread: P1635 dtc

    by spanks
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    2,040

    I have 1.9-3 volts at all sensors when they are...

    I have 1.9-3 volts at all sensors when they are all disconnected. Have had the PCM checked and no fault found. I have then tried another known good PCM just to make sure. Have done continuity tests...
  2. Thread: P1635 dtc

    by spanks
    Replies
    2
    Views
    2,040

    P1635 dtc

    Hey guys. Got an issue with a 1999 Holden Commodore Gen3. Bringing up DTC P1635 5V reference circuit 1 which effects MAP,TPS and oil pressure switch. Voltage is varying between 1.9 and 3 volts at...
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