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Home >> Saturn >> 2006 >> Vue Red Line, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls - 2.2L (L61) - DTC P0031 To DTC P0172) >> DTC P0031, P0032, P0037, or P0038 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. With the engine running at operating temperature, observe the HO2S Heater parameter with a scan tool and manipulate the related wiring and connectors.
    • 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 for 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, high resistance, or a faulty control module.
  5. Test for less than 5 ohms resistance in the HO2S sensor heater supply voltage circuit, the low control circuit, and the control module.
    • If more than 5 ohms, then repair the circuit with high resistance or replace the control module.
  6. If the control module and all circuits test normal, replace the HO2S sensor.
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