Massey Ferguson 04.00.05 – TRANS: Transmission High Pressure Sensor 2 Signal Voltage Issue

This code indicates that the electronic control system has detected an abnormal signal voltage from Transmission High Pressure Sensor 2. The fault typically points to an 8.5 V supply error, an open circuit, or a short in the sensor's signal circuit.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710SL
• 5711SL
• 5712SL
• 5713SL
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8650
• 8670
• 8690

1. 1

   Verify that the sensor is receiving the correct 8.5 V reference voltage

2. 2

   Inspect the wiring harness between the Transmission Control Module and the X34 sensor for chafed wires, corrosion in the connector pins, or signs of a short-to-ground/short-to-power

3. 3

   Ensure the connector is firmly seated and free of moisture or hydraulic fluid ingress

1. 1

   Park and secure the tractor

   Park the tractor on a level surface, turn off the engine, and engage the hand brake or ParkLock.

2. 2

   Relieve system pressure

   Relieve any residual pressure in the transmission/hydraulic system according to standard safety procedures.

3. 3

   Locate the sensor

   Locate Transmission High Pressure Sensor 2 (X34) on the transmission housing.

4. 4

   Disconnect the sensor

   Disconnect the electrical connector from the sensor.

5. 5

   Remove the sensor

   Unscrew and remove the faulty sensor.

6. 6

   Install the new sensor

   Install the new sensor and tighten to the manufacturer's specified torque. Reconnect the electrical harness.

7. 7

   Perform transmission calibration

   A transmission calibration procedure MUST be carried out systematically after changing the transmission high pressure sensor. Preliminary conditions for calibration: Hand brake applied or ParkLock engaged; Power Control lever in the neutral position; High/low speed range (Hare/Tortoise) in neutral (symbols should flash alternately on the right-hand screen).

8. 8

   Clear fault code and test

   Clear the 04.00.05 fault code using a diagnostic tool and test drive the tractor to ensure the code does not return.