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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0333) >> DTC P0030, P0031, P0032, P0036, P0037, or P0038 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
  2. Ignition ON, test for B+ between the ignition voltage circuit and ground.
    • HO2S 1 terminal 3
    • HO2S 2 terminal E
    • If less than the specified range, repair the ignition voltage circuit for a short to ground, or an open/high resistance.
  3. Test for 4.6-5 volts between the heater control circuit and ground.
    • HO2S 1 terminal 4
    • HO2S 2 terminal D
    • If less than the specified range, test the heater control circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the heater control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Connect a test lamp between the heater control circuit and B+. Engine idling, the test lamp should illuminate, or flash.
    • HO2S 1 terminal 4
    • HO2S 2 terminal D
    • If the test lamp does not illuminate, or flash, replace the ECM.
  5. If all circuits test normal, replace the appropriate HO2S.
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