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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P00B3 or P00B4: Radiator Coolant Temperature Sensor >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the B34 Engine Coolant Temperature Sensor.
  2. Test the RCT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance  table. The resistance values should be in range of the table values.
    • If not within the specified range 
    • Replace the B34 Engine Coolant Temperature Sensor.
    • If within the specified range 
  3. Test for infinite resistance between each terminal and the sensor housing.
    • If less than infinite resistance 

      Replace the B34 Engine Coolant Temperature Sensor.

    • If infinite resistance 
  4. All OK.
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