Massey Ferguson E4201.02 – Engine ECU: Crankshaft Speed Sensor Signal Issue

The crank speed signal is erratic and the controller is detecting too many noise pulses. The engine's evaluation module expects a highly specific sequence of pulses from the crankshaft speed sensor, generated by a trigger wheel with 58 teeth and a 2-tooth gap. If the sensor reads too many pulses between the gaps (due to electrical noise, a failing sensor, or debris), this code is triggered, which can lead to hard starting, misfires, or engine stalling.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• MF 4707
• MF 4708
• MF 4709
• MF 4710
• MF 5608
• MF 5609
• MF 5610
• MF 5611
• MF 5612
• MF 5613
• MF 5710 SL
• MF 5711 SL
• MF 5712 SL
• MF 5713 SL
• MF 7614
• MF 7615
• MF 7616
• MF 7618
• MF 7619
• MF 7620
• MF 7622
• MF 7624
• MF 7626
• MF 7714
• MF 7715
• MF 7716
• MF 7718
• MF 7719
• MF 7720
• MF 7722
• MF 7724
• MF 7726

1. 1

   Connect a diagnostic scan tool and monitor the Engine RPM while cranking the engine. If the RPM reads '0' or fluctuates wildly, the sensor signal is failing.

2. 2

   Remove the sensor and inspect the magnetic tip for metal shavings or debris from the engine that can cause erratic 'noise' pulses.

3. 3

   Inspect the wiring harness and the sensor's connector for chafing, corrosion, or loose pins.

4. 4

   Shine a flashlight into the sensor mounting hole and inspect the trigger wheel to ensure none of the 58 teeth are chipped or damaged.

5. 5

   Test the sensor's resistance with a multimeter and verify continuity in the wiring harness back to the Engine ECU.

1. 1

   Prep the Machine

   Turn off the ignition, remove the key, and disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Locate the Sensor

   The crankshaft position sensor is typically located on the front housing of the engine block (often below the fuel transfer pump) or near the crankshaft pulley/flywheel, depending on your specific AGCO Power engine layout.

3. 3

   Disconnect

   Unplug the wiring harness connector from the sensor.

4. 4

   Remove the Sensor

   Remove the retaining bolt (usually requiring a 10mm socket) that fastens the sensor to the housing. Carefully pull the sensor straight out.

5. 5

   Prep the New Sensor

   Ensure the mounting surface on the engine block is clean. Lubricate the O-ring on the new sensor with a small amount of clean engine oil to prevent tearing during installation.

6. 6

   Install

   Push the new sensor into the housing, insert the retaining bolt, and tighten it securely.

7. 7

   Reconnect

   Plug the wiring harness connector back into the sensor.

8. 8

   Clear Codes

   Reconnect the battery, use a diagnostic tool to clear the E4201.02 fault code, and start the engine to verify smooth operation.