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Circuit/System Verification: Notes

NOTE: The battery must be able to maintain a charge during this brake sensor performance procedure. It is recommended that a charger/maintainer or equivalent be used to maintain proper battery voltage during this procedure.
  1. Place the power button in the ON/RUN position.
  2. Place the transmission in PARK.
    3. NOTE: Do not depress the brake pedal during the EBCM relearn.
  3. Using a scan tool access the EBCM, Configuration/Reset Functions, EBCM Relearn. The EBCM relearn procedure will verify valve and pressure sensor calibrations are correct.
    4. NOTE: To ensure the complete brake modulator and high pressure accumulator (HPA) pressure relief procedure is allowed to occur; the brake controller must see 1 pedal apply with the propulsion system enabled, followed by a proper shutdown without applying the brake pedal.
  4. Enable the propulsion system.
  5. Apply and release the brake pedal.
    6. NOTE: The power button must be in the OFF position, and without applying the brake pedal to ensure the brake modulator and high pressure accumulator (HPA) pressure relief occurs. This process will take approximately 1-3 minutes.
  6. Place the power button in the OFF position, without applying the brake pedal.
  7. Remove the remote keyless entry (RKE) transmitter and close all of the vehicle doors.
  8. Wait approximately 1-3 minutes until the brake modulator and the high pressure accumulator (HPA) pressure relief is complete.
    9. NOTE: The power button must remain in the ON/RUN position, with the engine OFF during the remainder of this diagnostic procedure, unless otherwise instructed.
  9. Place the power button in the ON position, engine OFF, and do not apply the brake pedal.
  10. Using the scan tool, select Data Display for the EBCM, scroll through the data list, select and accept the following:
    • Master Cylinder Pressure Sensor
    • Rear Brake Pressure Sensor
    • Brake Pressure Sensor
    • Accumulator Pressure Sensor
    • Brake Controls Brake Pedal Position Sensor 5 V Reference
    • Brake Controls Brake Pedal Position Sensor Input A
    • Brake Controls Brake Pedal Position Sensor Input B
  11. Power button ON, engine OFF, brakes not applied, verify the following sensor parameters are within the specified values:
    • Brake Controls Brake Pedal Position Sensor 5 V Reference - Between 4.75-5.25 V
    • Brake Controls Brake Pedal Position Sensor Input A - Between 0.4-0.8 V
    • Brake Controls Brake Pedal Position Sensor Input B - Between 4.2-4.6 V
  12. Power button ON, engine OFF, brakes not applied, verify the following sensor parameters are within the specified values:
    • Master Cylinder Pressure Sensor Input - Less than 100 kPa (15 psi)
    • Rear Brake Pressure Sensor - Less than 100 kPa (15 psi)
    • Brake Pressure Sensor Input - Less than 100 kPa (15 psi)
    • Accum. Pressure Sensor - Less than 800 kPa (116 psi)
    • If any of the parameters are not within the specified range, replace the Q5 brake pressure modulator valve.
  13. Perform a hydraulic check, refer to Brake Hydraulic and Assist System Diagnosis .
  14. If the Brake Hydraulic and Assist System tests normal, replace the Q5 brake pressure modulator valve and verify DTC does not reset. If the DTC resets, replace the K17 EBCM.
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