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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P0131, P0132, P0134, P0137, P0138, or P0140 (LUW) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, Disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor.
  2. Ignition OFF, all vehicles systems OFF. It may take up to 2 min for all vehicle systems to power down. Test for less than 5 Ω between the low signal circuit terminal 3 and ground.
    • If greater than the specified range, test the low signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Ignition ON, test for 1.5-3.0 V between the high signal circuit terminal 4 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 K20 Engine Control Module.
    • If greater than the specified range, test the high signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Verify none of the following conditions exist:
    • Lean or rich fuel injectors - Refer to Fuel Injector Diagnosis .
    • Water intrusion in the HO2S harness connector
    • Low or high fuel system pressure - Refer to Fuel System Description .
    • Fuel that is contaminated - Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Fuel saturation of the evaporative emission (EVAP) canister
    • Exhaust leaks near the HO2S
    • Engine vacuum leaks
      • If you find any of the above conditions, repair as necessary.
  5. If all circuits test normal, replace the B52 Heated Oxygen Sensor.
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