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Home >> Chevrolet >> 2008 >> Optra LT, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.6L >> Diagnostic Information and Procedures >> Electronic Ignition (EI) System Diagnosis >> Circuit/System Testing

Circuit/System Testing

    IMPORTANT: Do not perform this diagnostic procedure if you were not sent here from a misfire DTC or the Engine Cranks but Does Not Run diagnostic.
  1. Ignition OFF, disconnect the harness connector at the ignition coil.
  2. Ignition ON, command the fuel pump relay ON with a scan tool. 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. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.
  3. Ignition OFF, test for less than 2 ohms of resistance between the ignition 1 voltage circuit terminal 2 and the fuse.
    • If greater than the specified range, repair the ignition 1 voltage circuit for high resistance.
  4. If all circuits test normal, test or replace the ignition coil.
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