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Home >> Chevrolet >> 2011 >> Caprice >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.0L - DTC Diagnostics And Troubleshooting >> Diagnostic Information and Procedures >> DTC P0351-P0358 >> Circuit/System Testing

Circuit/System Testing

  1. Engine running, observe the Cyl 1-8 IC Ckt. Gnd Test Status on the scan tool. Test Status should be OK or Not Run.
    • If test status is Fault test for open or short to ground.
  2. Engine running, observe the Cyl 1-8 IC Ckt. Open Test Status on the scan tool. Test Status should be OK or Not Run.
    • If test status is Fault test for open circuit.
  3. Engine running, observe the Cyl 1-8 IC Ckt. Short Volts Test Status on the scan tool. Test Status should be OK or Not Run.
    • If test status is Fault test for short to voltage.
  4. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.
    5. NOTE:

    The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit.

  5. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.
    • If the test lamp does not illuminate, test the 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.
  6. Connect a test lamp between the each of the ground circuits terminal A, and terminal B, and B+. The test lamp should illuminate on each circuit.
    • If the test lamp does not illuminate, test the suspected circuit for an open/high resistance.
  7. If all circuits test normal, test or replace the T8 ignition coil.
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