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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 P0135 >> 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 HO2S 1.
  2. Ignition ON, load test for B+ between the ignition voltage circuit terminal 3 and ground.
    • 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 terminal 4 and ground.
    • 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.
  4. Ignition ON, test for 2.5-3.5 volts between the high signal circuit terminal 1 and ground.
    • If less than the specified range, test the high signal 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 high signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Test for 2-3 volts between the low signal circuit terminal 5 and ground
    • If less than the specified range, test the low signal 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 low signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. If all conditions test normal, replace the HO2S 1.
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