Description:

The error code CAB 524166.04 occurs when the CAB control unit detects a low voltage reading from the right brake pedal sensor. This may indicate issues such as insufficient electrical current, poor wiring connections, or a malfunctioning sensor. The fault is specific to vehicles equipped with the AutoPowr™ / IVT™ transmission, which utilizes both a sensor and a switch on the brake pedal. Note that the PowerShift (PST) transmission does not use a brake pedal sensor.

Reaction:

Upon detecting the low voltage condition, the control unit initiates a ‘PARK’ position command to prevent any unintended vehicle movements. This safety measure is recoverable after the underlying issue has been resolved.

Recommendations:

• Inspect Brake Pedal Sensor: Check the sensor for any signs of damage or wear that could affect its functionality. Ensure that the sensor is properly mounted and free of physical defects.
• Test Sensor Voltage Output: Use a multimeter to measure the voltage output from the sensor while the brake pedal is pressed and released. Verify that the readings fall within the specified range provided in the manufacturer’s guidelines.
• Examine Wiring and Connectors: Inspect all wiring and electrical connectors related to the right brake pedal sensor for signs of damage, corrosion, or loose connections that could contribute to low voltage readings.
• Replace or Repair Faulty Components: If any components are found to be faulty, replace or repair them to restore proper operation. This may include replacing the sensor itself if it is unable to provide accurate voltage readings.
• Calibrate the Sensor: After repairs, recalibrate the brake pedal sensor to ensure it correctly registers the pedal’s position. Calibration procedures should follow the manufacturer’s specifications.
• Reset the Control Unit and Test the System: Clear any fault codes from the control unit and perform a test to ensure that the brake pedal sensor now operates correctly. Verify that the vehicle does not command a ‘PARK’ position erroneously and responds appropriately to brake pedal inputs.

Note:

Maintaining the electrical integrity of sensors, especially those involved in vehicle control systems like braking, is crucial for safety. Regular checks and prompt attention to issues such as low voltage readings are essential to prevent potential hazards and ensure the vehicle operates reliably.