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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1987 (Engine Controls And Fuel - 3.6L (LCS) - DTC P0008 To DTC P0193) >> DTC P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, or P0058 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function.
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    • If the hood position does not display Open, refer to DTC P254F .
  3. Ignition OFF, disconnect the harness connector at the appropriate heated oxygen sensor (HO2S).
  4. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 4 and ground.
      NOTE: The ignition voltage 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.
    • If the test lamp does not illuminate, 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 circuit and replace as necessary.
  5. Test for 4.8-5.2 V between the control circuit terminal 3 and ground.
    • If less than the specified range, test the control circuit for a short to ground, or an open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. Connect a test lamp between the heater control circuit terminal 3 and B+.
  7. Engine idling for 2 minutes. Verify the test lamp illuminates or flashes.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  8. If all circuits/connections test normal, test or replace the HO2S sensor.
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