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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Cooling Systems >> Hybrid/EV System Heating And Cooling System >> Diagnostic Information and Procedures >> DTC P0CEF-P0CF2 >> Circuit/System Testing

Circuit/System Testing

  1. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the B202 Hybrid/EV Electronics Coolant Temperature Sensor.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If less than 10 Ω 
  3. Vehicle in Service Mode.
  4. Verify the scan tool Hybrid Electronics Coolant Temperature is less than -35°C (-38.2°F).
    • If -35°C (-38.2°F) or greater 
    1. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for infinite resistance between the signal circuit and the circuits listed below:
      • Low reference circuit
      • Chassis ground
      • If less than infinite resistance, repair the appropriate short to ground on the circuit.
      • If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If less than -35°C (-38.2°F) 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  6. Verify the scan tool Hybrid Electronics Coolant Temperature is greater than 99°C (210°F).
    • If less than 99°C (210°F) 
    1. Vehicle OFF, remove the jumper wire, disconnect the X1 harness connector at the K114B Hybrid/EV Powertrain Control Module 2, Vehicle ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Vehicle OFF, test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If 99°C (210°F) or greater 
  7. Replace the B202 Hybrid/EV Electronics Coolant Temperature Sensor.
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