Massey Ferguson 4.X.90 – TRANS1 (Transmission Controller): Issue With Speed Sensor Values

No intermediate speed detected and current forward speed greater than 0. The transmission controller detects that the tractor is moving but is receiving a zero or dead signal from the intermediate speed sensor.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7600 Dyna-4/Dyna-6 models
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S

1. 1

   Use the Massey Ferguson Wintest software (or the tractor's onboard diagnostic screen) to monitor the active intermediate speed sensor value in RPMs while moving.

2. 2

   Check the sensor connector and the chassis control module harness for backed-out pins, corrosion, or damage. Verify there is no open circuit or short circuit to ground/+12V.

3. 3

   Disconnect the X483 sensor and measure the resistance across the pins. A healthy inductive sensor typically reads 450 Ohms (+/- 20 Ohms) when the tractor is stopped.

4. 4

   Check if the sensor has vibrated loose in the transmission housing, which would increase the air gap and cause a loss of signal.

1. 1

   Position the tractor on flat ground and engage the parking brake.

   Position the tractor on flat ground, turn off the engine, and engage the parking brake.

2. 2

   Disconnect the intermediate speed sensor (X483).

   Locate the intermediate speed sensor (X483) on the transmission housing and disconnect its electrical connector.

3. 3

   Unscrew the faulty sensor.

   Loosen the counter-nut and unscrew the faulty sensor from the housing.

4. 4

   Apply thread sealant to the new sensor.

   Apply a small amount of thread sealant (such as Loctite 5922) to the threads of the new sensor.

5. 5

   Screw the new sensor in fully.

   Screw the new sensor in fully until it gently bottoms out against the internal gear.

6. 6

   Establish the correct air gap.

   Unscrew the sensor by exactly ¾ of a turn to establish the correct air gap.

7. 7

   Tighten the counter-nut.

   Tighten the counter-nut to approximately 6 Nm to secure the sensor in place.

8. 8

   Reconnect and test drive.

   Reconnect the electrical connector, clear the fault codes, and test drive the tractor to verify the intermediate speed is now registering.