Massey Ferguson E157.15 – Engine Control Unit (ECU): Fuel Rail Pressure Below Requested Pressure

The actual fuel pressure inside the high-pressure common rail has dropped below the tolerance threshold requested by the engine management system.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 4700 Series
• 4707
• 4708
• 4709
• 4710
• 4600 Series
• 4608
• 4609
• 4610
• 5400 Series
• 5600 Series
• 5700 Series
• 6400 Series
• 6600 Series
• 6700 Series
• 7400 Series
• 7600 Series
• 7700 Series
• 8400 Series
• 8600 Series
• 8700 Series
• 2600H Series
• 2604H
• 2605H
• 2606H
• 2607H

1. 1

   Check fuel level and quality to ensure adequate fuel that is not gelled or contaminated with water.

2. 2

   Inspect primary and secondary fuel filters for clogs, which are a primary cause of fuel starvation.

3. 3

   Check the fuel lift pump/supply pump to ensure it is delivering adequate low-pressure fuel to the high-pressure injection pump.

4. 4

   Inspect all fuel lines, injector lines, and the common rail for visible fuel leaks.

5. 5

   Inspect the 3-pin electrical connector and wiring harness leading to the fuel rail pressure sensor for corrosion, damage, or loose connections.

1. 1

   Depressurize system

   Turn off the tractor, remove the key, and allow the engine to cool completely. Warning: The common rail system operates at extreme pressures (up to 2000 bar). You must allow the system to fully depressurize before opening any lines.

2. 2

   Clean area

   Thoroughly clean the area around the common rail and the pressure sensor to prevent dirt or debris from entering the open fuel system.

3. 3

   Disconnect connector

   Disconnect the 3-pin electrical connector from the fuel rail pressure sensor.

4. 4

   Remove sensor

   Using the appropriate wrench, carefully unscrew the faulty sensor from the common rail.

5. 5

   Install new sensor

   Install the new OEM fuel rail pressure sensor. (Note: Thread sizes are typically M14 x 1.5 or M18 x 1.5 depending on the specific engine/sensor part number). Torque to the manufacturer's specifications.

6. 6

   Reconnect connector

   Reconnect the 3-pin electrical connector.

7. 7

   Prime fuel system

   Prime/bleed the low-pressure fuel system if required by your specific model's manual.

8. 8

   Inspect for leaks

   Start the engine and inspect the rail area closely for any fuel leaks.

9. 9

   Clear codes and test

   Use a diagnostic tool to clear the E157.15 fault code from the ECU and test drive the machine under load to ensure the code does not return.