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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Controls And Fuel - 2.4L - DTC P0114 To DTC P0604) >> Diagnostic Information and Procedures >> DTC P0116: Engine Coolant Temperature (ECT) Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  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 vehicle systems to power down.
  2. Test for less than 5Ω between the low reference terminal A or 2 and ground.
    • If 5Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module.
    2. Test for less than 2Ω in the low reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 engine Control Module.
    • If less than 5Ω 
  3. Ignition ON.
  4. Verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F).
    • If warmer than -39°C (-38°F) 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal B or 1 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 engine Control Module.
    • If colder than -39°C (-38°F) 
  5. Install a 3A fused jumper wire between the signal circuit terminal B or 1 and the low reference circuit terminal A or 2.
  6. Verify the scan tool ECT sensor parameter is warmer than 149°C (300°F).
    • If 149°C (300°F) or colder 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module, ignition ON.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Ignition OFF
    4. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 engine Control Module.
    • If warmer than 149°C (300°F) 
  7. Test or replace the B34 Engine Coolant Temperature Sensor.
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