Massey Ferguson E157.03 – Engine ECU: Fuel Rail Pressure Sensor High Voltage

Rail pressure sensor voltage above normal or open circuit. This indicates that the signal voltage returning from the fuel rail pressure sensor to the controller is higher than the maximum expected threshold, which almost always points to an electrical open circuit, a disconnected sensor, a severed wire, or an internally shorted/failed sensor.

• 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
• 5400 series
• 6400 series
• 5600 series
• 6600 series
• 7600 series
• 8600 series
• 8700 series
• 4600 series
• 7400 series
• 5611-5613
• 6497
• 6612-6616
• 7497
• 8450-8480
• 5445-5475
• 6445-6480
• 7465-7480
• 2600H series
• 2604H
• 2605H
• 2606H
• 2607H

1. 1

   Visually inspect the 3-pin electrical connector at the fuel rail pressure sensor for backed-out pins, corrosion, or water intrusion.

2. 2

   Trace the wiring harness from the sensor back to the Engine ECU, looking for chafed, melted, or severed wires that would cause an open circuit.

3. 3

   Perform a voltage test with the key ON and engine OFF. Disconnect the sensor and probe the harness connector for a 5V reference signal, a sensor ground, and a signal return line (a broken ground wire will output a high voltage fault).

4. 4

   Check fuel system integrity for massive leaks in the common rail system and ensure fuel filters are clean, as secondary pressure anomalies can trigger related codes.

1. 1

   Preparation

   Clean the area around the fuel rail thoroughly. Common rail systems are highly sensitive to microscopic contamination; dirt entering the rail can destroy fuel injectors.

2. 2

   Depressurize

   Ensure the engine has been off for an adequate amount of time to allow the high-pressure fuel rail to depressurize.

3. 3

   Disconnect

   Disconnect the negative battery terminal. Unplug the 3-pin electrical connector from the sensor.

4. 4

   Removal

   Using the appropriate wrench, carefully unscrew the faulty pressure sensor from the fuel rail. Have clean rags ready to catch residual fuel.

5. 5

   Installation

   Thread the new OEM sensor into the rail (common thread sizes are M14 x 1.5 or M18 x 1.5 depending on the engine). Torque strictly to the manufacturer's specifications to prevent leaks or thread damage.

6. 6

   Reassembly

   Reconnect the 3-pin harness and the battery.

7. 7

   Priming

   Cycle the ignition key to the ON position several times without cranking the engine. This allows the lift pump to prime the system and build low-pressure fuel before starting.

8. 8

   Clear Codes

   Connect the Massey Ferguson EDT (Electronic Diagnostic Tool) to clear the E157.03 code from the ECU, or clear it via the dashboard interface if your specific model supports it.