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Ground Circuits

  1. Disconnect PCM connectors. Using an ohmmeter, check for continuity to ground on PCM harness ground terminals. See PCM GROUND CIRCUIT TERMINALS  table. Resistance should be zero ohms. If not, locate and repair open in wire.
    PCM GROUND CIRCUIT TERMINALS

    Vehicle PCM Connector Terminal No.
    Amigo, Rodeo & Trooper (V6) Blue F1
    Blue F40
    Red S1
    Red S23
    Red S40
    Hombre C1 18
    C1 60
    C2 21
    Except Amigo, Hombre, Rodeo & Trooper (V6) White C7
    White C8
    White C9
  2. Reconnect PCM connectors. Using a voltmeter, connect negative lead of voltmeter to a good ground. Backprobe positive lead of voltmeter to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, short, corrosion or loose connection on ground circuit. Repair as necessary.
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