Massey Ferguson E174.00 – Engine ECU / EEM (Electronic Engine Management): Fuel temperature sensor ALARM (> 85 °C / 185 °F)

The fuel inlet temperature has exceeded the maximum safe operating threshold of 85°C. The system typically initiates a fuel limit by map or power degradation mode to protect the engine and fuel injection components from heat damage.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• MF 5400 Series
• MF 5600 Series
• MF 6400 Series
• MF 7600 Series
• 7617
• MF 8400 Series
• MF 8600 Series

1. 1

   Connect the Massey Ferguson EDT or WinEEM service tool to check live fuel temperature data. If it reads an impossibly high value immediately on a cold engine, the sensor or wiring is faulty.

2. 2

   Inspect the wiring harness and the two-pin connector going to the fuel temperature sensor for chafed wires, corrosion, or a short circuit that could send a false high-voltage signal.

3. 3

   Unplug the sensor and test its resistance with a multimeter, comparing the reading against the OEM temperature/resistance chart to check for an internal short.

4. 4

   If the sensor is reading accurately, investigate mechanical causes for fuel overheating, such as a blocked fuel cooler, a failing fuel transfer pump, or operating under heavy load with an extremely low fuel level.

1. 1

   Preparation

   Turn off the engine, remove the key, and allow the engine to cool. Relieve any residual pressure in the fuel system.

2. 2

   Locate the Sensor

   Locate the fuel temperature sensor, which is typically threaded into the fuel filter housing or the high-pressure fuel injection pump head.

3. 3

   Disconnect

   Depress the locking tab and disconnect the gray two-pin electrical connector from the sensor.

4. 4

   Removal

   Using a properly sized wrench on the sensor's hex nut middle section, carefully unscrew the faulty brass sensor. Have a rag ready to catch any minor fuel spillage.

5. 5

   Installation

   Thread the new fuel temperature sensor into the housing. Tighten it to the specified torque (do not overtighten, as the brass threads can shear).

6. 6

   Reconnect

   Plug the electrical connector back in, ensuring it clicks securely into place.

7. 7

   Bleed the System

   If a significant amount of fuel was lost or air entered the lines, use the manual primer pump to bleed the fuel system.

8. 8

   Clear Codes

   Reconnect the EDT/WinEEM diagnostic tool, save the error log, and then erase the E174.00 fault code. Restart the ECU/tractor to confirm the code does not return.