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Circuit/System Verification

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DTC C0561 4B and DTC C0561 59 

This diagnostic detects if the pressure sensor calibration is correct.

    NOTE:

    The battery must be able to maintain a charge during this procedure. It is recommended that a charger/maintainer or equivalent be used to maintain proper battery voltage during this procedure.

  1. Ignition ON, engine OFF, using a scan tool access the EBCM, Module Setup screen, and perform the EBCM Relearn. The relearn procedure will verify valve and pressure sensor calibrations are correct.
    2. NOTE:

    To ensure the complete brake modulator and high pressure accumulator pressure relief procedure is allowed to occur; the brake controller must see one brake pedal apply with the engine running followed by a proper shutdown without applying the brake pedal.

  2. Transmission in PARK, engine running, apply and release the brake pedal.
    3. NOTE:

    The ignition must transition to the OFF position without pausing at ACCESSORY and without applying the brake pedal. This ensures that the brake modulator and high pressure accumulator relief occurs. This process will take approximately 1-2 minutes.

  3. Ignition OFF, key removed from the ignition, wait 2 minutes.
    4. NOTE:

    The ignition must remain in the ON position with the engine OFF during the following steps.

  4. Ignition ON, brake pedal released, verify the following EBCM scan tool parameters are within the specified range:
    • BMC Prim. Piston Pos. Sen. 5 V Reference Position - Between 4.75 - 5.25 V
    • BMC Primary Piston Position Sensor A - Between 0.4 - 0.8 V
    • BMC Primary Piston Position Sensor B - Between 4.2 - 4.6 V
  5. Brakes not applied, verify the following EBCM scan tool parameters are within the specified range:
    • 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 brake pressure modulator valve.
  6. Perform a hydraulic check, refer to Brake Hydraulic and Assist System Diagnosis (Two-mode Hybrid) .

DTC C0561 54 

This diagnostic detects an over temperature condition with 1 of the 12 solenoids due to an extended ABS, traction control and the vehicle stability enhancement system event lasting more than 45 seconds. This does not indicate a failure with the EBCM. If the DTC continues to set under normal conditions, then replace the EBCM.

DTC C0561 71, 72, 74, and 75 

This diagnostic detects invalid serial data from another module which causes the EBCM to deactivate ABS, traction control and the vehicle stability enhancement system.

  1. Use the scan tool Enhanced Diagnostics Data screen to determine which module is transmitting the invalid signal.
  2. The module that is transmitting the invalid data should not have any DTCs set.
  3. If the module has no DTCs set, refer to DTC U0100-U02FF (without HP2) , DTC U0100-U02FF (with HP2) .
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