John Deere 001058.16 – VCU / CCU: Air Brake Pressure Too High Or Failed Sensor Rear Chassis

The system has detected that the air brake pressure is too high or there is a failure in the sensor located on the rear chassis. The control unit is receiving a pressure reading from the air brake application pressure sensor (SPN 1058) that is valid but above the normal operating range (FMI 16). This indicates either an actual over-pressure situation in the air brake system or a malfunction in the sensor itself sending inaccurate high readings, which may affect the proper operation of the braking system.

• 8225R
• 8245R
• 8270R
• 8295R
• 8310R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 7R Series
• 6R Series
• 6M Series

1. 1

   Verify System Air Pressure: Use a calibrated mechanical pressure gauge to measure the actual air pressure in the brake system and compare it to the value being reported by the machine's electronic display to determine if there is a true over-pressure condition or a sensor reading error.

2. 2

   Inspect for Air System Contamination: Blow out the air lines and check for moisture or sludge in the air tanks, which can indicate a problem with the air dryer.

3. 3

   Check for Leaks and Restrictions: Inspect all air lines and fittings between the compressor, air dryer, tanks, and brake valves for leaks (listen for hissing), kinks, or restrictions.

4. 4

   Inspect Electrical Wiring and Connectors: Examine the wiring harness and connectors leading to the brake application pressure sensor for any signs of damage, corrosion, or loose connections.

5. 5

   Check Governor Operation: Verify that the air compressor governor is functioning correctly and maintaining system pressure within the specified cut-in and cut-out range.

1. 1

   Safely Park the Machine

   Park the tractor on a level surface, engage the park brake, and shut down the engine. Chock the wheels to prevent any movement.

2. 2

   Relieve Air System Pressure

   Safely drain all air pressure from the system by opening the drain valves on the air tanks.

3. 3

   Locate and Replace the Sensor

   The brake application pressure sensor is located on the rear chassis, integrated into the air brake system's valve assembly. Once located, disconnect the electrical connector and carefully unscrew the sensor from its port.

4. 4

   Install the New Sensor

   Apply thread sealant sparingly if required, being careful not to let any enter the air system. Install the new sensor and tighten it to the manufacturer's specified torque. Reconnect the electrical connector.

5. 5

   Address System Over-Pressure (if applicable)

   If the diagnostic checks indicated an actual over-pressure condition, the root cause must be addressed. This may involve repairing or replacing a faulty air compressor governor, cleaning restricted lines, or servicing the air dryer.

6. 6

   Recharge and Test the System

   Close the air tank drain valves, start the engine, and allow the air system to build pressure. Monitor the pressure gauge to ensure it stays within the correct operating range. Check for air leaks using a soapy water solution.

7. 7

   Clear Fault Codes

   Use a compatible diagnostic tool to clear the 001058.16 fault code from the control unit's memory.

8. 8

   Verify Repair

   Operate the machine and the braking system to confirm that the fault code does not reappear and that the brakes are functioning correctly.