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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 165 (Engine Controls And Fuel - 2.7L (L3B) - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0128 or P01F0 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the appropriate electrical connector: B34 Engine Coolant Temperature Sensor
  3. Test the resistance between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2 @ Component
  4. Verify the value is within the range listed in the table: Temperature Versus Resistance - Engine Coolant Temperature Sensor
    • If not in the specified range 

      Replace the appropriate component: B34 Engine Coolant Temperature Sensor

    • Go to next step: If in the specified range 
  5. Test for infinite resistance between the test points: Each terminal of the component & The component's housing
    • If less than infinite resistance 

      Replace the appropriate component: B34 Engine Coolant Temperature Sensor

    • Go to next step: If infinite resistance 
  6. All OK.
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