John Deere 637: Engine Speed Sensor Signal Has Incorrect Pulse Pattern

The Engine Speed Sensor is generating a pulse pattern that is not correct, which may affect the proper operation of the engine. This issue is associated with several tractor models and is related to the signal output of the sensor.

1. 1

   The condition and alignment of the Engine Speed Sensor

2. 2

   The wiring and connections to the Engine Speed Sensor

3. 3

   The integrity of the signal being sent from the Engine Speed Sensor to the controller

1. 1

   Inspect the Engine Speed Sensor

   Check for physical damage, misalignment, or contamination that could affect the sensor's ability to generate a correct pulse pattern.

2. 2

   Check the wiring and connections

   Verify that all wiring and connections to the Engine Speed Sensor are secure, undamaged, and free from corrosion.

3. 3

   Test the signal output

   Use a diagnostic tool to monitor the signal output from the Engine Speed Sensor and confirm whether the pulse pattern is correct.