Kubota E:9105 – Engine Control Unit (ECU): Fuel temperature sensor system error

Triggers when the engine control module detects that the signal from the fuel temperature sensor is out of the expected range (e.g., voltage too high or too low, indicating an open circuit, short circuit, or a faulty sensor). The sensor monitors the temperature of the fuel exiting the pump to optimize fuel injection timing and prevent excessive fuel vapor emissions.

• SVL75
• SVL75-2
• SVL75-3
• SVL90
• SVL95-2s
• SVL97-2
• SSV65
• SSV75
• R530
• R540
• R630
• R640
• KX080-4
• M6060
• M7060
• LX3310
• LX3520

1. 1

   Inspect the wiring harness leading to the fuel temperature sensor for chafed wires, rodent damage, or a loose/corroded connector.

2. 2

   Using a multimeter, verify that the ECU is sending the proper reference voltage (typically 5V) to the sensor connector.

3. 3

   Test the sensor's internal resistance; the resistance should change smoothly as the sensor is exposed to different temperatures.

4. 4

   Model-Specific Quirk (SVL95-2s / SVL97-2): If getting this error alongside a P3019 (Fuel Pump Calibration Required) and the scan tool shows a fuel temp of -40°C, temporarily wire a 1k-ohm resistor between ECU pins A-74 and A-95 to simulate a normal fuel temperature reading.

1. 1

   Preparation

   Turn off the machine, remove the key, and disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Locate the Sensor

   The fuel temperature sensor is typically located on the fuel supply line between the high-pressure fuel pump and the fuel rail, or threaded into the fuel filter housing.

3. 3

   Removal

   Depress the locking tab on the electrical pigtail and disconnect the harness. Place a shop rag beneath the sensor to catch residual diesel fuel. Use a wrench to carefully unthread the sensor from its housing.

4. 4

   Installation

   Thread the new OEM fuel temperature sensor into the housing by hand to prevent cross-threading, then tighten to the torque specification listed in the Kubota WSM (Workshop Manual).

5. 5

   Reassembly

   Reconnect the electrical harness until it clicks. Reconnect the negative battery cable.

6. 6

   Clear Codes

   Connect the Kubota Diagmaster tool to the machine's diagnostic port to clear the E:9105 historical fault code and verify that the live fuel temperature data is reading correctly.