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Home >> Chevrolet >> 2006 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0351 or P0352 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the ignition coil.
    2. IMPORTANT: The test lamp is used to load the circuit and may not illuminate.
  2. Connect a test lamp between the ignition 1 voltage circuit of the ignition coil and the negative terminal of the battery.
  3. Ignition ON, test for less than 0.1 volt between the ignition 1 voltage circuit of the ignition coil and the positive terminal of the battery.
    • If greater than 0.1 volt, repair the ignition 1 voltage circuit of the ignition coil for a short to ground or an open/high resistance.
    4. IMPORTANT: Set the DMM to the AC Hertz scale for this test.
  4. Connect a DMM between the appropriate ignition control circuit and the negative terminal of the battery.
  5. While cranking the engine, test for more than 3 Hz between the appropriate ignition control circuit and the negative terminal of the battery.
    • If less than 3 Hz, test the ignition control circuit for a short to voltage, short to ground or an open/high resistance. If the circuit/connection test normal, replace the ECM.
  6. If all circuits/connections test normal, replace the ignition coil.
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