Description:

Error code BCU 001883.31 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects that the speed of the rear Power Take-Off (PTO) exceeds the specified safe operational limits. This diagnostic trouble code points to potential issues with the PTO system’s control or a malfunctioning rear PTO speed sensor. If this code appears despite the rear PTO speed being within normal limits, it suggests that an operational check of the rear PTO speed sensor is necessary to verify sensor accuracy and functionality.

Reaction:

The BCU may limit or disable the rear PTO function to prevent mechanical damage or ensure operator safety due to the reported high speed.

Recommendations:

• Perform Rear PTO Speed Sensor Operational Check: As outlined in Section 245, Group BCU of the service manual, conduct a thorough operational check of the rear PTO speed sensor to determine if it is functioning correctly and accurately reporting PTO speed.
• Inspect Rear PTO Speed Sensor and Associated Wiring: Check for any physical damage, wear, or electrical interference affecting the rear PTO speed sensor. Inspect wiring for shorts, frays, or loose connections that could result in inaccurate speed readings.
• Calibrate or Replace Sensor: If the sensor check reveals any discrepancies or failures in sensor output, recalibrate the sensor if possible, or replace it if it is found to be defective.
• Test PTO System After Repairs: After any necessary repairs, recalibrations, or replacements, test the rear PTO system to ensure it operates within the correct speed parameters and that the BCU no longer detects excessive speeds.
• Reset the BCU and Clear Diagnostic Codes: Clear the error code from the BCU and reset the system to ensure that all changes are recognized and that the system functions without triggering the same error under normal operating conditions.

Note:

Monitoring and maintaining the rear PTO speed within manufacturer-recommended limits is crucial for the safety and longevity of the machinery. Regular checks and maintenance of the PTO system and its sensors can help prevent issues that might lead to operational inefficiencies or potential safety hazards. Properly functioning sensors ensure accurate feedback to the control unit, facilitating appropriate operational responses and maintaining overall system integrity.