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Home › Cadillac › 2018 › CT6 Plug-In › Repair and Diagnosis › Brakes › Traction Control › Antilock Brake System (Hybrid) › Diagnostic Information and Procedures › DTC P05FF › Circuit/System Testing

Circuit/System Testing

  1. Perform the brake hydraulic check, refer to Hydraulic Brake System Diagnosis .
  2. Vehicle OFF, disconnect the harness connector at the B201 Brake Control Brake Pedal Position Sensor.
  3. Test for less than 5 Ω between the low reference circuit terminal 3 and ground.
    • If 5 Ω or greater 
    1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
    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 K17 Electronic Brake Control Module.
    • Go to next step: If less than 5 Ω 
  4. Vehicle in Service Mode.
  5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than 4.8 V 
    1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 5 V 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 K17 Electronic Brake Control Module.
    • If greater than 5.2 V 
    1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, vehicle in service mode.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K17 Electronic Brake Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  6. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 1 parameter is less than 1 V.
    • If 1 V or greater 
    1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, vehicle in service mode.
    2. Test for less than 1 V between the signal circuit terminal 2 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K17 Electronic Brake Control Module.
    • Go to next step: If less than 1 V 
  7. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 1.
  8. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 1 parameter is greater than 4.5 V.
    • If 4.5 V or less 
    1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
    2. Test for infinite resistance between the signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. 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 K17 Electronic Brake Control Module.
    • Go to next step: If greater than 4.5 V 
  9. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 2 parameter is greater than 80%.
    • If 80% or less 
    1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
    2. Test for infinite resistance between the signal circuit terminal 4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K17 Electronic Brake Control Module.
    • Go to next step: If greater than 80% 
  10. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 3.
  11. Verify the scan tool Brake Controls Brake Pedal Position Sensor Circuit 2 is less than 10%.
    • If 10% or greater 
    1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, vehicle in service mode.
    2. Test for less than 1 V between the signal circuit terminal 4 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.
    4. 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 K17 Electronic Brake Control Module.
    • Go to next step: If less than 10% 
  12. Replace the K177 Brake Booster Control Module.
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