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Ground Circuits

  1. Turn ignition off. Using an ohmmeter, check continuity between chassis ground and ECU ground terminals. See GROUND TERMINAL IDENTIFICATION  table. Ohmmeter should indicate zero ohms. If reading is not zero ohms, repair open circuit between ECU connector and ground.
  2. Connect voltmeter negative lead to chassis ground. Connect positive lead to ECU ground terminals. See GROUND TERMINAL IDENTIFICATION  table. With engine running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection in ground circuit.
    GROUND TERMINAL IDENTIFICATION

    Application ECU Terminal
    Mirage 101 & 106
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