John Deere 637: Engine Speed Sensor Signal Missing

The system has detected that the Engine Speed Sensor signal is missing. This may result in improper engine performance or operational issues. The affected circuit is indicated by this code.

1. 1

   Engine Speed Sensor

2. 2

   Wiring to Engine Speed Sensor

3. 3

   Controller input for Engine Speed Sensor

1. 1

   Inspect

   Check the Engine Speed Sensor for physical damage or misalignment.

2. 2

   Test

   Verify the wiring and connections to the Engine Speed Sensor for continuity and proper termination.

3. 3

   Check

   Confirm that the controller is receiving the Engine Speed Sensor signal as expected.