Kubota E:9110 – Main ECU: Main relay system error

Indicates an error in the 'Main relay system'. The system has detected a malfunction, voltage irregularity, or communication failure involving the main electrical relay that powers the machine's primary control systems.

• SVL65-2
• SVL75
• SVL75-2
• SVL95-2s
• SVL97-2
• SSV65
• SSV75
• R430
• R530
• R630

1. 1

   Verify the battery is fully charged and the terminals are clean and tight.

2. 2

   Check the main chassis grounds and the ground wire leading to the starter relay and ignition switch.

3. 3

   Inspect the main wire harness (specifically around the cab relay/ECU box) for broken wires, rodent damage, or loose connectors.

4. 4

   Locate the main relay block and test the main relay for continuity and proper switching when the ignition is turned on.

5. 5

   Test the ignition switch to ensure it is sending the correct voltage to the main relay when turned to the 'ON' position.

1. 1

   Disconnect Power

   Always disconnect the negative battery cable before servicing the electrical system.

2. 2

   Locate the Relay/ECU Panel

   Access the electrical panel (usually located inside the cab behind the access panel or under the seat, depending on the specific SVL/SSV model).

3. 3

   Inspect and Replace the Relay

   Pull the main relay. Check the socket for melted plastic or corrosion. If the relay is faulty, replace it with a new OEM relay.

4. 4

   Check the Main ECU

   If the relay and wiring are intact but the code persists, the Main ECU may have an internal fault in its relay control circuit.

5. 5

   Reassemble and Clear Codes

   Reconnect the battery, turn the ignition on, and verify if the code clears. If a new ECU was installed, it may require dealer programming (Diagmaster software) to sync with the machine.