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Home >> Pontiac >> 2009 >> G8 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - Troubleshooting & Diagnosis >> Electronic Ignition System Diagnosis >> Circuit/System Testing
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Circuit/System Testing

    NOTE: 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 of the ignition coil.
  2. Ignition ON, load test for battery voltage between the ignition voltage circuit terminal D and ground.
    • If less than B+, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition voltage circuit and replace as necessary.
  3. Crank or start the engine. Test for 200-400 mV between the appropriate IC circuit terminal C and ground.
    • If less than the specified value, test the IC circuit for a short to ground or an open/high resistance. If the circuit/connection tests normal, replace the ECM.
    • If greater than the specified value, test the IC circuit for a short to voltage. If the circuit/connection tests normal, replace the ECM.
  4. Ignition OFF, connect a test lamp between the low reference circuit terminal B and B+. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuit/connection tests normal, replace the ECM.
  5. Connect a test lamp between the ground circuit terminal A and B+. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the circuit for an open/high resistance.
  6. If all circuits/connections test normal, replace the ignition coil.
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