Massey Ferguson 04.X.05 – TRANS: Transmission High Pressure Sensor 2 Signal Voltage Issue

The Transmission Control Module is receiving an inconsistent or out-of-range signal voltage from Transmission Oil High Pressure Sensor 2 (X34), most commonly caused by an 8.5 V supply error, a short/open circuit in the wiring, or an internal failure of the sensor itself.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8670
• 8690

1. 1

   Verify that the sensor is receiving its required 8.5V supply voltage from the transmission module using a multimeter.

2. 2

   Inspect the wiring and connector at Sensor 2 (Component X34) for corrosion, loose pins, or wire chafing that could cause a short to ground or an open circuit.

3. 3

   Perform a swap test by exchanging Sensor 1 (X9) and Sensor 2 (X34). If the fault code changes to 04.X.07 / T4107, the sensor is faulty. If the code remains 04.X.05, the issue is in the wiring harness or the transmission control module.

1. 1

   Preparation

   Ensure the tractor is parked on a level surface with the engine off. Relieve any residual hydraulic pressure.

2. 2

   Removal

   Locate Transmission High Pressure Sensor 2 (X34) on the transmission housing. Disconnect the electrical connector and unscrew the sensor.

3. 3

   Installation

   Thread the new sensor into the port and tighten to the OEM torque specification. Reconnect the electrical harness.

4. 4

   Mandatory Calibration

   A transmission calibration procedure MUST be carried out systematically after changing the transmission high pressure sensor. Preliminary conditions: hand brake applied (or ParkLock engaged), Power Control lever in neutral, and High/Low speed range (Hare/Tortoise) in neutral.

5. 5

   Clear Codes

   Clear the DTCs from the dashboard/control center and test drive the tractor to ensure the transmission shifts correctly and the code does not return.