Description:

This error code, EPC 000191.17, is generated when, with the engine running, the EPC commands forward or reverse movement but registers no or too low transmission speed. The potential causes include:

• Circuit problem at the transmission speed sensor (B104).
• Circuit problem at the forward solenoid valve (Y33) or reverse solenoid valve (Y36).
• Circuit problem at the proportional solenoid valve for transmission enable (Y38).
• Forward solenoid valve (Y33), reverse solenoid valve (Y36), or proportional solenoid valve for transmission enable (Y38) stuck closed.

Reaction:

When this error is detected, the transmission may not respond correctly to commands, leading to issues with movement and overall functionality of the tractor.

Recommendations:

Inspect Transmission Speed Sensor Circuit:

• Check the wiring and connections to the transmission speed sensor (B104) for any signs of damage or faults. Repair or replace as necessary.

Inspect Solenoid Valve Circuits:

• Verify the wiring and connections to the forward solenoid valve (Y33), reverse solenoid valve (Y36), and proportional solenoid valve for transmission enable (Y38). Repair or replace any faulty components.

Test Solenoid Valve Operation:

• Use diagnostic tools to test the functionality of the solenoid valves. Ensure they are operating correctly and not stuck closed.

Replace Faulty Components:

• Replace any defective sensors or solenoid valves identified during the inspection and testing process.

Reset and Test System:

• After addressing the issues, reset the system and test the transmission to ensure proper operation and that the error code does not reoccur.

Note:

Regular maintenance of the transmission components, including sensors and solenoid valves, is essential to prevent such faults and ensure reliable operation.