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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Engine Controls - 3.9L - DTC P0011 To P0420) >> DTC P0030, P0053 or P0135 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  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 sensor low control circuit and battery voltage. The lamp should not illuminate.
    • If the lamp illuminates then test the 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 then 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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