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Ground Circuits

  1. Turn ignition off. Locate PCM. PCM is located behind top right side of instrument panel, behind glove compartment. Using a DVOM, check continuity between ground and PCM connector pins. See IDENTIFYING PCM GROUND PINS  table. See Figure. If continuity does not exist, repair open ground circuit as necessary. If continuity exists, go to next step.
  2. Touch negative lead of voltmeter to a good ground. With vehicle running, backprobe positive lead of voltmeter to each ground terminal. Voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection on ground lead.
    IDENTIFYING PCM GROUND PINS

    PCM Pin No. Wire Color
    10 Black
    19 Black
    39 Black/Red
    45 Black/Red
    96 Black
    104 Black
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