Massey Ferguson 00.00.54 – Dash: Issue With Signal Voltage From Air Brake pressure Sensor (Dash)

This indicates that the controller is receiving an abnormal electrical signal (voltage that is too high, too low, or erratic) from the sensor responsible for monitoring the pneumatic pressure in the tractor's air brake system (typically used for trailer brakes).

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)

1. 1

   Inspect the wiring harness running from the Dash module to the Air Brake Pressure Sensor for chafing, cuts, or melted insulation.

2. 2

   Disconnect the sensor and check the electrical connector for moisture, corrosion, or backed-out pins.

3. 3

   Using a multimeter, verify that the sensor is receiving the correct reference voltage (usually 5V) and a solid ground from the Dash module.

4. 4

   Back-probe the signal wire to monitor the voltage output. The voltage should change smoothly as air pressure builds up or drops in the system. If the voltage is stuck at 0V or 5V regardless of air pressure, the sensor is likely internally shorted or open.

5. 5

   Ensure the tractor's air compressor is functioning and there are no massive air leaks in the brake lines or air tanks that would prevent pressure from building.

1. 1

   Safety First

   Park the tractor on a level surface, engage the parking brake, and turn off the engine.

2. 2

   Disconnect Power

   Disconnect the negative (-) battery cable to prevent electrical shorts and clear volatile memory.

3. 3

   Depressurize the System

   Drain the air from the pneumatic brake tanks using the drain valves to ensure there is no compressed air behind the sensor before removal.

4. 4

   Locate the Sensor

   Locate the Air Brake Pressure Sensor, which is typically threaded into the primary air tank or the air brake valve manifold block.

5. 5

   Remove the Sensor

   Unplug the electrical connector. Use a wrench to carefully unthread the old sensor from the air port.

6. 6

   Install the New Sensor

   Apply a thread sealant (if not already pre-applied to the new sensor) and thread the new sensor into the port. Tighten to the manufacturer's specified torque.

7. 7

   Reassemble

   Reconnect the electrical harness to the sensor. Reconnect the negative battery cable.

8. 8

   Test

   Start the tractor and allow the air compressor to build system pressure. Check the Dash to ensure the air pressure registers correctly and the 00.00.54 fault code changes to "Inactive" or clears entirely. Spray soapy water around the sensor threads to verify there are no air leaks.