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Home >> Buick >> 2012 >> Regal GS, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls/Fuel - 2.0L - DTC P0010 To DTC P0336 >> Diagnostic Information and Procedures >> DTC P0116 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B34 engine coolant temperature sensor. It may take up to 2 minutes for all vehicles systems to power down.
  2. Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor.
  3. Test for less than 5 Ω between the low reference circuit terminal A 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 K20 engine control module.
  4. Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F).
    • If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT Sensor parameter is warmer than 142°C (288°F).
    • If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  6. If the circuits test normal, test or replace the B34 engine coolant temperature sensor.
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