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Home >> Chevrolet >> 2011 >> Aveo LS, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.6L (LXV) - DTC P2544/DTC P2A00 >> DTC P2A00 >> Circuit/System Testing

Circuit/System Testing

  1. Engine idling, move the HO2S 1 harness connector and the engine control module (ECM) harness connector while monitoring the HO2S 1 voltage parameter. Verify that the HO2S parameter does not change abruptly while moving the related harnesses.
    • If the HO2S parameter does change abruptly while moving the related harnesses repair the circuit as necessary.
  2. Ignition OFF, disconnect the harness connector at the HO2S 1.
  3. Ignition OFF for 1 minute, test for less than 5 Ω between the low reference circuit terminal 3 and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, test for 1.5-2.1 V between the signal circuit terminal 1 and ground.
    • If less than the specified range, test the 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 signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 3. Engine running, verify the scan tool HO2S parameter is less than 60 mV.
    • If greater than the specified value, replace the ECM.
  6. Verify none of the following conditions exist:
    • If you find any of the above conditions, repair as necessary.
  7. If all circuits test normal, test or replace the HO2S 1.
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