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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 230 (Engine Controls And Fuel - 4.4L - DTC P0010 To DTC P0158) >> DTC P0033 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the SCB solenoid.
  2. Ignition ON, verify that a test lamp illuminates between the ignition supply circuit and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. Connect a test lamp between the control circuit and the ignition supply circuit.
  4. Engine running, command the SCB solenoid duty cycle from 0 percent to 90 percent with a scan tool. The test lamp should change brightness when incrementing between the commanded states.
    • If the test lamp remains ON all the time, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp remains OFF all the time, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test the SCB solenoid. Refer to Component Testing for instructions.
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