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Home >> Chevrolet >> 2011 >> Suburban C2500 >> Repair and Diagnosis >> External Pages >> Different car >> Section 1754 (Engine Controls And Fuel - Hybrid (LZ1) - DTC P0010 Through DTC P0341) >> Diagnostic Information and Procedures >> DTC P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0135, P0141, P0155, or P0161 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. 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. Disconnect the harness connector at the appropriate HO2S.
  3. 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 ignition voltage circuit for a short to ground or an open/high resistance. If the circuit test normal and the HO2S heater circuit fuse is open, test all components connected to the fuse and replace as necessary.
  4. Verify that a test lamp does not illuminate between the control circuit terminal C and B+.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  5. Engine idling, the test lamp should illuminate, or flash.
    • If the test lamp does not illuminate or flash, test the control circuit for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the ECM
  6. If all circuits test normal, test or replace the appropriate HO2S.
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