Case IH 3022 – Engine Control Unit (ECU): Boost pressure sensor - signal not plausible

The engine control system is receiving a voltage or pressure reading from the boost pressure sensor that does not make logical sense given the current engine operating conditions (e.g., RPM, load, and atmospheric pressure).

• Magnum 235-340 (Series 4)
• MX Series
• TG Series
• Puma Series
• Farmall 115U
• Axial-Flow 5130
• Axial-Flow 6130
• Axial-Flow 7010
• 580 Super N
• 480 Industrial Tractors

1. 1

   Inspect the wiring harness leading to the boost pressure sensor for chafing, breaks, or corrosion that could cause a short or open circuit.

2. 2

   Verify the ambient atmospheric pressure sensor is reading correctly, as the ECU compares this to the boost pressure; a defective ambient sensor (often code 3023) can cause a false 3022 code.

3. 3

   Check live data via an Electronic Service Tool to see if the boost pressure sensor is stuck on a default value or fluctuating erratically.

1. 1

   Locate the boost pressure sensor

   Locate the boost pressure sensor (typically mounted on the intake manifold, often just above the oil filter depending on the specific FPT engine model).

2. 2

   Inspect the electrical harness

   Disconnect the electrical harness from the sensor and inspect the pins for damage or moisture.

3. 3

   Test wiring continuity

   Test the wiring continuity back to the Engine ECU.

4. 4

   Evaluate sensor failure

   If the wiring is intact and the ECU's internal atmospheric pressure sensor is functioning normally, the boost pressure sensor itself has failed internally.

5. 5

   Replace the sensor

   Remove the defective boost pressure sensor and install the replacement part.

6. 6

   Clear fault codes and verify

   Clear the fault codes using a diagnostic tool and run the engine under load to verify the code does not return.