Massey Ferguson E9070 – Engine Control Unit (ECU) / Electronic Engine Management (EEM) / TPU: Crankshaft speed sensor / Engine speed signal

The engine control module is not receiving a valid or expected rotational speed signal from the crankshaft position/speed sensor, which is critical for managing fuel injection timing, ignition timing, and emissions systems.

• 8600 series
• 5400 series
• 6400 series
• 7400 series
• 7600 series

1. 1

   Perform diagnostic tests on the speed sensors using Wintest software before replacing any parts (per Service Bulletin TRAC 43/08)

2. 2

   Inspect the sensor's electrical connector and wiring harness for moisture, corrosion, backed-out pins, or fatigue

3. 3

   Verify that the sensor's air gap (the distance between the sensor tip and the crankshaft position ring) is correct and free of debris

1. 1

   Locate the Sensor

   The crankshaft speed sensor is typically mounted near the flywheel housing where it can read the crankshaft position ring. Note: On some models (like the 6499), accessing engine/transmission speed sensors may require removing a tire or other obstructing components for clearance.

2. 2

   Disconnect

   Carefully unplug the electrical connector from the sensor harness.

3. 3

   Remove

   Extract the one or two mounting bolts securing the sensor to the housing, then pull the sensor out.

4. 4

   Clean

   Thoroughly clean the mounting area on the housing to ensure the new sensor seats perfectly flat.

5. 5

   Install

   Insert the new OEM sensor. Check and set the correct air gap if adjustable on your specific engine model.

6. 6

   Secure

   Tighten the mounting bolts and reconnect the electrical harness, ensuring the weather seal clicks into place.

7. 7

   Clear Codes

   Use the diagnostic tool to clear the E9070 fault code and run the tractor to verify the engine RPM registers correctly on the dash.