Case IH F-157-02 - ECU – Engine Control Module (ECM / ECU): Rail pressure sensor value is intermittent.

The control module is receiving an erratic, unstable, or incorrect voltage signal from the common rail fuel pressure sensor (B-015).

• MAGNUM AFS Connect
• 240 Series Axial-Flow Combines
• Steiger series (350 to 600 HP)
• Magnum series (235–340 Series 4)
• Puma series
• Farmall series (95U, 105U, 115U Pro EP)
• A8000 and A8800 Sugar Cane Harvesters

1. 1

   Check for concurrent codes: If faults like 3110 / DTC 1225 (Rail pressure sensor value is above maximum offset) or 3811 (ECM 5-volt sensor supply 1 out of range) are active, diagnose and resolve those first.

2. 2

   Inspect the physical mounting of the B-015 rail pressure sensor to ensure it is properly secured, as a loose sensor can cause intermittent readings.

3. 3

   Check the battery voltage on the instrument cluster with the engine running at 2000 RPM to ensure the system is receiving stable overall power.

4. 4

   With the ignition switch OFF, use a multimeter to check the B-015 signal circuit for continuity, broken conductors, or a short-to-high voltage source between the sensor connector and the ECM pins (e.g., X-917 connector).

1. 1

   Turn the ignition switch to the OFF position.

2. 2

   Locate the Common Rail Pressure Sensor (B-015) on the engine's high-pressure fuel rail.

3. 3

   Disconnect the sensor's electrical connector and inspect the pins for corrosion, moisture, or pushed-out terminals.

4. 4

   If the multimeter diagnostic checks revealed a short or break in the wiring harness, locate and repair the damaged conductor.

5. 5

   If the wiring harness and connectors are in good condition but the intermittent signal persists, the sensor itself has failed internally. Remove the faulty rail pressure sensor.

6. 6

   Install the new Common Rail Pressure Sensor and torque it to the engine manufacturer's specifications.

7. 7

   Reconnect the wiring harness, clear the inactive fault codes from the ECM, and run the engine to verify the repair.