Massey Ferguson 04.01.9E – TRANS2: Transmission Input Shaft Speed Sensor Signal Fault

The electronic control system is receiving an erratic, missing, or out-of-range signal from the transmission input shaft speed sensor.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5400
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 6400
• 6600
• 6700
• 7600
• 8100
• 8200

1. 1

   Inspect the wiring harness leading to the sensor for any breaks, chafing, or corrosion, as open circuits or poor connections often trigger signal faults.

2. 2

   Check the sensor gap to ensure it is positioned correctly relative to the internal tone ring to read accurately.

3. 3

   Inspect the condition of the tone ring itself for damage or metallic debris that could prevent the inductive sensor from generating a clean signal.

1. 1

   Disconnect Power

   Always disconnect the tractor's battery before starting electrical work.

2. 2

   Locate the Sensor

   The transmission input shaft speed sensor is typically located on the transmission housing, often near the PTO shaft where access can be tight.

3. 3

   Clean the Area

   Thoroughly clean the mounting area around the sensor before removal to prevent dirt, dust, or moisture from falling into the transmission housing.

4. 4

   Remove and Replace

   Unbolt the faulty sensor and carefully extract it. Install the new weather-resistant inductive sensor.

5. 5

   Set the Gap

   Ensure the new sensor is positioned correctly relative to the tone ring.

6. 6

   Reassemble and Test

   Reconnect the wiring harness, reconnect the battery, and clear the fault codes. Test drive the tractor to verify that the transmission receives accurate speed data and shifts smoothly.