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Home >> GMC >> 2022 >> Terrain AT4 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC C2A22 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function:Deactivate Brake Boost System
  3. Verify there are no leaks in the component/system:Brake System - Refer to:Brake Fluid Loss 
  4. Apply the brake pedal. - More than 2 times.
  5. Ignition/Vehicle - Off - For greater than 10 min
  6. Ignition - On / Vehicle - In Service Mode - Brake Pedal Not Applied
  7. Perform the scan tool control function:Brake Hydraulics Test
    • Go to next step: If the procedure/test passes 
  8. Perform the following steps: - 10 times
    1. Apply the brake pedal slowly from 0- 40bar
    2. Hold the pressure constant for at least 10s
    3. Release the brake pedal slowly
  9. Wait 30s
  10. Verify DTC C2A22 is not set.
    • If DTC C2A22 is set 
    11. NOTE:

    The drive cycle can be cumulative, it does not need to be continuous.

  11. Test drive the vehicle. - Greater than 30 km/h (19 MPH) - For 30 s
  12. Ignition/Vehicle - Off - For greater than 2 min - Brake Pedal Not Applied
    1. Ignition - On / Vehicle - In Service Mode
    2. Verify DTC C2A22 is not set.
      • If DTC C2A22 is set

        Replace the component:A104 Brake Master Cylinder

      • Go to next step: If the DTC is not set
    3. All OK.
    • Go to next step: If the DTC is not set 
  13. All OK.
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