ECU 000637.10 – Crank Sensor Input Pattern Error. John Deere System Advisory.

ECU 000637.10 (ECU 637.10)

Code: 000637.10

Shortcode: 637.10


Error code ECU 000637.10 indicates that the ECU detects an improper pattern or noise in the crankshaft speed signal. This irregularity can lead to incorrect engine timing and potentially cause misfires or reduced engine performance.


The ECU may adjust engine timing or reduce power to mitigate the effects of the erroneous signal, protecting the engine from damage.


  • Inspect Sensor and Wiring: Check the crankshaft speed sensor and its wiring for any damage, loose connections, or signs of wear that could introduce noise.
  • Shield Wiring from Interference: Ensure that sensor wiring is properly shielded to prevent electromagnetic interference that could cause signal noise.
  • Replace Faulty Sensor: If the sensor is found to be defective, replace it to ensure accurate signal patterns.
  • Verify Signal Integrity: Use diagnostic tools to confirm the integrity of the crankshaft speed signal and ensure no noise or improper patterns are present.
  • Reset ECU and Conduct Tests: After repairs, reset the ECU and perform tests to verify that the crankshaft speed signal is accurate and stable.


Maintaining a clean and accurate signal from the crankshaft speed sensor is crucial for optimal engine performance and timing accuracy.

Control Units: John Deere

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