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Ground Circuits

  1. Turn ignition off. Using an ohmmeter, check for continuity between ground and ECU terminals No. 101 and 106. Resistance should be zero ohms. If resistance is not zero ohms, repair open circuit between ECU connector and ground.
  2. Connect voltmeter negative lead to ground. Connect positive lead to ECU ground terminals as in step 1. With vehicle running, voltmeter should indicate less than 1 volt. If voltmeter reading is greater than 1 volt, check for open, corrosion or loose connection in ground circuit.
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