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Home >> Chevrolet >> 2021 >> Bolt EV Premier >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC P057B-P057E, P05DC-P05DF, or P05E0 >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: B201 Brake Control Brake Pedal Position Sensor
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 3 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector: K177 Brake Booster Control Module
    2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 3 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K177 Brake Booster Control Module
    • Go to next step: If less than 10 Ω 
  4. Ignition - On/Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 1 & Low Reference circuit terminal 2
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K177 Brake Booster Control Module
    3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 Ω between the test points: 5 V Reference circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K177 Brake Booster Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K177 Brake Booster Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K177 Brake Booster Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  6. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground
    • If greater than 1 V 
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector: K177 Brake Booster Control Module
  9. Ignition - On/Vehicle - In Service Mode
  10. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • If less than 1 V - Replace the component: K177 Brake Booster Control Module
    • Go to next step: If less than 1 V 
    1. Disconnect the electrical connector: K177 Brake Booster Control Module
    2. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
  11. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  12. Test for less than 1 V between the test points: Signal circuit terminal 4 @ Component harness & Ground
    • If greater than 1 V 
  13. Ignition/Vehicle - Off
  14. Disconnect the electrical connector: K177 Brake Booster Control Module
  15. Ignition - On/Vehicle - In Service Mode
  16. Test for less than 1 V between the test points: Signal circuit terminal 4 @ Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • If less than 1 V - Replace the component: K177 Brake Booster Control Module
    • Go to next step: If less than 1 V 
    1. Disconnect the electrical connector: K177 Brake Booster Control Module
    2. Test for infinite resistance between the test points: Signal circuit terminal 4 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
  17. Test for less than 2 Ω between the test points: Signal circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  18. Test or replace the component: K177 Brake Booster Control Module
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