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Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0351 or P0352 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ignition coil.
  2. Command the fuel pump relay ON with a scan tool and test for battery voltage between the ignition 1 voltage circuit terminal 2 and ground.
    • If less than B+, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance.
    3. IMPORTANT: Set the DMM to the AC Hertz scale for this test.
  3. Connect a DMM between the appropriate ignition control circuit and ground.
  4. Engine cranking, test for more than 3 Hz between the appropriate ignition control circuit and ground.
    • If less than the specified range, test the ignition control circuit for a short to voltage, short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the ignition coil.
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