New Holland ENG 263 – Engine Controller (Engine ECU / EDC): Fuel Temperature Sensor voltage is too high

The engine controller is detecting a signal voltage above 4.9 Volts, which typically points to an open circuit, a disconnected sensor, or a short to power in the sensor wiring. Caution: If the fuel temperature is genuinely too high (or if the system defaults to a high-temperature strategy due to the sensor failure), the injector pump may be damaged because hot fuel loses its lubrication properties.

• T6
• T7
• T6000
• T7000
• TG255
• TG285
• TJ275
• TJ325
• TM series
• CR9090
• CX8080
• CX8090
• FR450
• E235BSR series

1. 1

   Visually inspect the fuel temperature sensor connector and the wiring harness leading back to the Engine ECU for disconnected plugs, broken wires, or corrosion.

2. 2

   Using a multimeter and an interface harness, probe the sensor's signal wire (red boot/reference volts) and ground (black boot) to check voltage.

3. 3

   Verify the sensor voltage reading; a normal reading is approximately 2.5 volts (± 0.2V), while a reading above 4.9V confirms the ENG 263 fault condition.

4. 4

   Perform a continuity test between the sensor harness connector and Pin A35 on the Engine Controller to rule out a broken wire in the main harness.

1. 1

   Turn off the machine and disconnect the battery ground.

   Turn off the machine and disconnect the battery ground to prevent electrical spikes during repair.

2. 2

   Locate the Fuel Temperature Sensor.

   Locate the Fuel Temperature Sensor, which is typically threaded directly into the primary fuel system manifold lines or the fuel filter housing.

3. 3

   Disconnect the sensor plug.

   Disconnect the 2-pin sealed oval plug from the sensor.

4. 4

   Remove the faulty sensor.

   If the diagnostic checks proved the wiring is intact but the sensor is internally open/faulty, remove the faulty sensor using a 19.00 mm spanner/wrench. Have a rag ready to catch any residual fuel.

5. 5

   Install the new OEM replacement sensor.

   Install the new OEM replacement sensor (M14 x 1.5 metric pitch threads). Do not overtighten, as it features a hermetically sealed brass casing.

6. 6

   Reconnect the wiring harness.

   Reconnect the wiring harness securely until the locking tab clicks.

7. 7

   Reconnect the battery and clear the fault code.

   Reconnect the battery, turn the key to the ON position, and use a diagnostic tool (or the machine's onboard display) to clear the inactive ENG 263 fault code.

8. 8

   Start the engine and verify the repair.

   Start the engine and verify that the fuel temperature reads normally and the code does not return.