Fendt 08.1.13 – Rear EPC: Short circuit related to the Y021 and Y022 solenoid valves

The system has detected a short circuit on the solenoid valve circuit, specifically between pin 2 to 6 or pin 14 to 6. The electrohydraulic lifting gear control is immediately locked for safety, preventing the power lift from operating electronically.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• Fendt 200 Vario
• Fendt 300 Vario (COM III, SCR, S4)
• Fendt 400 Vario (COM III) / Farmer 400
• Fendt 500 Vario (SCR)
• Fendt 700 Vario (COM III, SCR) / Favorit 700
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM II, COM III, S4) / Favorit 900

1. 1

   Perform a mechanical override test on the Y021 and Y022 solenoid valves to ensure the hydraulic lifting and lowering functions still work mechanically

2. 2

   Inspect the wiring harness connecting the Rear EPC to the solenoid valves for rubbed, melted, or pinched wires that could cause a short to earth or battery voltage

3. 3

   Disconnect separation points X332 (Y021) and X333 (Y022) and test for continuity and short circuits specifically between pins 2 and 6, and pins 14 and 6

4. 4

   Measure the internal resistance of the Y021 and Y022 solenoid coils using a multimeter to determine if the short circuit is internal to the valve

1. 1

   Locate the Valves

   Locate the Y021 and Y022 solenoid valves. Depending on the exact model, they are typically located on the rear power lift control block (or the standard front power lift block if the code is triggered on a front-PTO/lift specific circuit).

2. 2

   Disconnect Power

   Turn off the tractor ignition and disconnect the battery to prevent further electrical damage during testing.

3. 3

   Disconnect Separation Points

   Unplug connectors X332 (Y021) and X333 (Y022).

4. 4

   Isolate the Short

   Based on your diagnostic pin testing, determine if the short is in the tractor's main wiring harness or inside the solenoid coil.

5. 5

   Repair or Replace

   If the wiring harness is shorted, repair the damaged section of the wiring and apply heat-shrink tubing. If the solenoid coil fails the resistance test (internal short), unbolt and replace the faulty Y021 or Y022 solenoid valve.

6. 6

   Reassemble and Clear Codes

   Reconnect the X332 and X333 connectors. Reconnect the battery, turn on the ignition, and use the FENDIAS diagnostic tool to clear the 08.1.13 fault code.

7. 7

   Operational Test

   Test the raise and lower functions using the in-cab controls and external fender buttons to verify the EPC control is no longer locked.