Massey Ferguson 14.00.0A – TRANS1: Brake Pressure Sensor High Volts Dyna 6 (TRANS1)

The transmission control unit has detected that the signal voltage from the brake pressure sensor is abnormally high (typically outside the 0-5V operating range, such as > 5V). This usually indicates a short circuit to a power source (+12V or +5V reference) or an open ground circuit in the sensor or its wiring harness. It is heavily associated with the High Pressure Brake System and the ParkLock system.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5709 S
• 5710 S
• 5711 S
• 5712 S
• 5713 S
• 6713 S
• 6714 S
• 6715 S
• 6716 S
• 6718 S
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7715 S
• 7716 S
• 7718 S
• 7720 S
• 7722 S
• 7724 S
• 7726 S

1. 1

   Inspect the wiring harness connecting the brake pressure sensor to the TRANS1 module for chafed wires, melted insulation, or pinched harnesses that could cause a short to power.

2. 2

   Disconnect the sensor and check the pins for corrosion, water ingress, or bent terminals.

3. 3

   Using a multimeter (key on, engine off), verify that the ground circuit has continuity to the chassis/ECU ground and the reference voltage is exactly 5V.

4. 4

   Check if the signal wire has voltage on it while disconnected; if so, there is a short to power in the harness.

5. 5

   Use the AGCO EDT to monitor live voltage. If the voltage reads high (5V+) but drops to 0V when the sensor is unplugged, the sensor itself has failed internally.

1. 1

   Preparation

   Park the tractor on a level surface, engage the park brake (if functional), turn off the engine, and remove the key.

2. 2

   Depressurize

   Safely relieve any residual air or hydraulic pressure in the high-pressure brake/ParkLock system by pumping the brake pedals before opening the system.

3. 3

   Locate the Sensor

   Locate the brake pressure sensor on the transmission valve block or air brake supply block (refer to your specific model's Dyna 6 hydraulic/pneumatic schematic).

4. 4

   Removal

   Disconnect the electrical harness from the sensor. Use a wrench to carefully unscrew the sensor from the port. Have a rag ready to catch any minor fluid drips if it is on a hydraulic circuit.

5. 5

   Installation

   Install the new OEM sensor. Ensure the sealing washer or O-ring is properly seated. Torque to the manufacturer's specification.

6. 6

   Reconnection

   Reconnect the electrical harness, ensuring the locking tab clicks into place.

7. 7

   Clear Codes

   Turn the ignition on and use the AGCO EDT or the tractor's dashboard diagnostic menu to clear the 14.00.0A fault code.

8. 8

   Testing

   Start the tractor and test the brake and ParkLock operation. Verify that the code does not return and that the transmission shifts out of Park normally.