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Home >> Chevrolet >> 2010 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0191 >> DTC P0135, P0141, P0155, or P0161 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
    • If the test lamp does not illuminate, test the ignition 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.
  3. Ignition OFF, connect a test lamp between the heater control circuit terminal D and B+. The test light should not illuminate.
    • If the test lamp illuminates, test the heater control circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
  4. Idle the engine, 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.
    5. NOTE: The control circuit for the HO2S heater is pulled-up to voltage within the ECM, 2.0-3.0 V on the control circuit is normal.
  5. Ignition ON, test for 2.0-3.0 V between the control circuit terminal D and ground.
    • If not within the specified range, test the control circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. If all circuits/connections test normal, test or replace the HO2S.
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