New Holland 3019 – ECU: Boost Pressure Sensor - Signal Above Range Max

The Engine Control Unit (ECU) has detected a voltage signal from the boost pressure sensor that is above the maximum expected range. This indicates that the sensor is reporting an unusually high boost pressure, which could be caused by a sensor malfunction, a wiring short to power, or an actual engine over-boost condition. Because the ECU relies on this signal to regulate the air-fuel mixture and control the turbocharger, this fault can lead to a loss of power, poor fuel economy, rough idling, engine knocking, and excessive black smoke.

• T6020
• T6030
• T6040
• T6050
• T7.170
• T7.185
• T7.200
• T7.210
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T7030
• T7040
• T7050
• T7060
• T8.300
• T8.330
• T8.360
• T8.390
• T8.420
• T9.390
• T9.450
• T9.505
• T9.560
• CX860
• CX880

1. 1

   Visually inspect the tubing between the turbocharger and the intake manifold for leaks, damage, or loose connections, ensuring all clamps are tight.

2. 2

   Inspect the boost pressure sensor on the intake manifold to ensure it is securely mounted and the sensing port is free of soot or carbon buildup.

3. 3

   Disconnect and inspect the electrical connector and sensor pins for damage, corrosion, or pushed-out pins.

4. 4

   Check the wiring harness with Key ON, Engine OFF for a +5V supply at the sensor connector and verify ground pin continuity to chassis ground. If there is no voltage, check for an open circuit or a short to ground in the wiring back to the ECU.

5. 5

   Test the signal wire voltage: with the sensor disconnected, the ECU should detect an open circuit. With the sensor connected and the engine running, back-probe the signal wire (should be 0.9-1.1V at low idle to 1.0-1.3V at high idle). A signal stuck at 5V indicates a short to power or internal sensor failure.

6. 6

   Perform a resistance test on the sensor pins (e.g., for CX models: Pins 1-2 ~3.3 kΩ, Pins 2-3 ~2.5 kΩ, Pins 1-3 ~2.5 kΩ).

7. 7

   Monitor live data using a diagnostic tool to compare MAP, BARO, and EBP readings with key on and engine off; they should be closely aligned. If the boost pressure reading is significantly different, the sensor is likely faulty.

1. 1

   Address mechanical and electrical issues

   Repair any leaks in the turbocharger tubing, wiring faults, or connector problems found during the diagnostic checks.

2. 2

   Clean the sensor

   If the sensor port is clogged with soot, carefully clean it using an appropriate cleaner and a soft brush. Reinstall and check if the fault clears.

3. 3

   Replace the boost pressure sensor

   If diagnostic tests (such as resistance or live data monitoring) point to a faulty sensor, replace the boost pressure sensor.

4. 4

   Clear fault codes

   After completing repairs, use a diagnostic tool to clear the fault code from the ECU's memory and verify that it does not return.