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Home >> Chevrolet >> 2006 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.9L - DTC P0010 To DTC P0420 >> DTC P0036, P0054, or P0141 >> Circuit/System Testing
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Circuit/System Testing

  1. With the engine running at operating temperature, observe the HO2S Heater parameter with a scan tool and manipulate the related wiring and connectors. Manipulation should not affect the parameter.
    • If manipulation does affect the parameter then repair the harness or connector.
  2. With the ignition ON, the engine OFF, and the sensor disconnected, connect a test lamp between the HO2S sensor heater supply voltage circuit and ground. The lamp should illuminate.
    • If the lamp does not illuminate then test the voltage supply circuit for high resistance or a short to ground.
  3. With the ignition OFF, connect a test lamp between the HO2S heater low control circuit and battery voltage. The lamp should not illuminate.
    • If the lamp illuminates, test the heater low control circuit for a short to ground or a faulty control module.
  4. With the engine RUNNING, leave the test lamp connected from the previous step. The lamp should flash or be ON steady.
    • If the test lamp is not ON steady or flashing, test the control circuit for a short to voltage or a faulty control module.
  5. Test for less than 5 ohms resistance in the HO2S sensor heater supply voltage circuit, the heater low control circuit, and the control module.
    • If more than 5 ohms, repair the circuit with high resistance, or replace the control module.
  6. If the ECM and all circuits test normal, replace the HO2S sensor.
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