Massey Ferguson 4.X.15 – TRANS2: Transmission Pressure Switch Open When Engine Is Running

When the engine is running, the transmission pump generates hydraulic pressure, which should cause the transmission pressure switch to close. If the switch remains "open," the control module detects a fault. This condition indicates either a genuine lack of hydraulic pressure in the transmission, a failed pressure switch, or a broken/disconnected wire (open circuit) in the switch's harness.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S

1. 1

   Verify the transmission/hydraulic fluid is at the correct level and is in good condition. Low fluid will cause a genuine low-pressure situation.

2. 2

   Inspect the wiring harness leading to the transmission pressure switch. Look for chafed wires, disconnected plugs, or corrosion inside the connector that could cause an open circuit reading.

3. 3

   Using a multimeter, test the transmission pressure switch for continuity. It should change state (close) when the engine is running and pressure is applied.

4. 4

   Hook up a mechanical hydraulic pressure gauge to the transmission test port to verify if the transmission is actually producing the required pressure. If mechanical pressure is within spec but the code persists, the switch or wiring is faulty. If mechanical pressure is low, there is an internal transmission or pump issue.

1. 1

   Park the tractor on a level surface, engage the parking brake, and turn off the engine. Relieve any residual hydraulic pressure if applicable.

   Park the tractor on a level surface, engage the parking brake, and turn off the engine. Relieve any residual hydraulic pressure if applicable.

2. 2

   Locate the transmission pressure switch (typically threaded into the side of the transmission housing or the power shift manifold block).

   Locate the transmission pressure switch (typically threaded into the side of the transmission housing or the power shift manifold block).

3. 3

   Thoroughly clean the area around the switch to prevent dirt and debris from entering the transmission hydraulic circuit.

   Thoroughly clean the area around the switch to prevent dirt and debris from entering the transmission hydraulic circuit.

4. 4

   Disconnect the electrical harness connector from the switch.

   Disconnect the electrical harness connector from the switch.

5. 5

   Place a catch pan underneath the area, as a small amount of hydraulic fluid will leak out.

   Place a catch pan underneath the area, as a small amount of hydraulic fluid will leak out.

6. 6

   Use a wrench to unthread and remove the faulty pressure switch.

   Use a wrench to unthread and remove the faulty pressure switch.

7. 7

   Install the new transmission pressure switch, ensuring the sealing washer or O-ring is properly seated. Torque to the manufacturer's specification.

   Install the new transmission pressure switch, ensuring the sealing washer or O-ring is properly seated. Torque to the manufacturer's specification.

8. 8

   Reconnect the electrical harness connector.

   Reconnect the electrical harness connector.

9. 9

   Start the engine, check the area for fluid leaks, and verify that the dashboard warning light extinguishes.

   Start the engine, check the area for fluid leaks, and verify that the dashboard warning light extinguishes.

10. 10

    Clear the 04.01.15 fault code from the TRANS2 module using a diagnostic scan tool.

    Clear the 04.01.15 fault code from the TRANS2 module using a diagnostic scan tool.