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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1713 (Engine Controls And Fuel - 3.6L (LCS) - DTC P2231 To DTC P2636) >> DTC P2251 or P2254 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. 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 1.
  2. Ignition ON, test for 2-3 V between the low reference circuit terminal 2 and ground.
    • If less than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, replace the appropriate HO2S 1.
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