Description:

This diagnostic trouble code (TCU 524153.03) is generated if the control unit registers resistance and voltage at the solenoid valve that do not correspond with the switch status of disk brake BG. This indicates a short to a positive lead or a defective solenoid valve. The fault can be recognized by the control unit during initialization (control unit boot sequence after the ignition is switched ON) or with the transmission in speed bands 1 and 2.

Reaction:

When this error code is detected, the equipment may experience issues with the operation of the disk brake, leading to potential performance problems. The system might enter a protective mode to prevent further issues, resulting in limited operational capabilities or warnings displayed to the operator.

Recommendations:

1. Inspect Solenoid Valve Circuit:

• Check for Shorts to Positive Lead: Inspect the wiring for any signs of shorting to a positive lead.
• Ensure Secure Connections: Make sure all connections are secure and free of corrosion.

2. Test the Solenoid Valve:

• Measure Voltage: Use a multimeter to measure the voltage at the signal input of the BG solenoid valve.
• Replace if Faulty: Replace the solenoid valve if it is providing high voltage readings.

3. Examine Wiring and Connectors:

• Inspect for Damage: Check the wiring and connectors associated with the solenoid valve for damage or disconnection.
• Repair or Replace: Repair or replace any damaged components.

4. Verify Control Unit Functionality:

• Test Control Unit: Ensure that the control unit is correctly processing the solenoid valve signals.
• Update Software: Update the control unit software if necessary.

Note:

Maintaining the solenoid valve and its associated circuitry is crucial for accurate disk brake operation. Regular inspections and prompt repairs can help prevent issues related to high voltage readings.