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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P00B6: Radiator Coolant Temperature (RCT) (LUV) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF, disconnect the harness connector at the B203 engine coolant radiator temperature sensor.
  2. Vehicle OFF, all systems OFF. This may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω 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 K20 engine control module.
  3. Vehicle ON, verify the scan tool Radiator Coolant Temperature Sensor parameter is at -40°C (-40°F).
    • If warmer than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
    4. NOTE:

    If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.

  4. Install a 1 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool Radiator Coolant Temperature Sensor parameter is at 140°C (284°F).
    • If less than 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.
  5. If all circuits test normal, test or replace the B203 engine coolant radiator temperature sensor.
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