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Home >> Saturn >> 2008 >> Astra XR, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P000A To DTC P0365 >> DTC P0116 >> Circuit/System Testing

Circuit/System Testing

  1. Verify that debris is not blocking the airflow through the front of the grille area.
  2. Verify that the port of the passenger side AAT sensor is free of debris and contamination.
  3. Inspect the MAF/IAT sensor elements for contamination, and debris.
  4. Ignition OFF, disconnect the harness connector at the ECT sensor.
  5. Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor.
  6. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  7. Disconnect the ECM.
  8. Test the ECT signal circuit between terminal 1 and ECM connector X 1 terminal 60 for less than 5 ohms.
    • If greater than the specified range, test the signal circuit for a high resistance.
  9. If the circuits test normal, test or replace the ECT sensor.
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