Case IH 19063 (F-3216-31) – Engine ECU: Upstream NOx sensor supply voltage is out of range

This fault indicates an electrical issue where the supply voltage being sent to the upstream Nitrogen Oxide (NOx) sensor—located in the exhaust system before the Selective Catalytic Reduction (SCR) catalyst—is outside the expected operating parameters. This prevents the sensor from accurately measuring the NOx content of the exhaust gases, which is required for the DEF (Diesel Exhaust Fluid) dosing system to function properly.

• VESTRUM CVX
• Magnum 180
• Magnum 200
• Magnum 220
• Magnum 240
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum 380
• Puma 150
• Puma 165
• Puma 185
• Puma 200
• Puma 210
• Puma 220
• Maxxum 115
• Maxxum 125
• Maxxum 135
• Maxxum 145
• Maxxum 150
• Steiger 370
• Steiger 420
• Steiger 470
• Steiger 500
• Steiger 540
• Steiger 580
• Steiger 620
• Farmall 40
• Farmall 45
• Farmall 50
• Farmall 110A
• Farmall 120A
• Farmall 130A
• Farmall 140A
• 240 Series Axial-Flow 5140
• 240 Series Axial-Flow 6140
• 240 Series Axial-Flow 7140
• 240 Series Axial-Flow 7240
• 240 Series Axial-Flow 8240
• 240 Series Axial-Flow 9240
• Patriot 2250
• Patriot 3240
• Patriot 3340
• Patriot 4440
• Titan 3040
• Titan 3540
• Titan 4040
• Titan 4540
• Austoft 9900

1. 1

   Inspect the wiring harness and the 5-pin connector leading to the upstream NOx sensor for corrosion, damaged pins, open circuits, or shorts to ground/battery.

2. 2

   Verify the actual supply voltage reaching the sensor connector from the Engine ECU to confirm if the voltage is genuinely out of range or if the sensor's internal circuitry has failed.

3. 3

   Verify DEF fluid quality, DEF injector operation, and DEF pump pressure to rule out basic DEF supply issues that can trigger cascading codes.

4. 4

   Use the Electronic Service Tool (EST) to monitor the SCR upstream temperature sensor to ensure the exhaust system is reaching proper operating temperatures.

1. 1

   Replace the Sensor

   Remove the faulty upstream NOx sensor from the exhaust pipe and install the new sensor. (Note: Sensors are typically threaded M20 x 1.5).

2. 2

   Reset ECU Data

   Use the CNH Electronic Service Tool (EST) to reset the learned values. Navigate to the SCR electrical system menu, select 'Replacement of the Nox Upstream Sensor – Reset ECU Data', click the 'CONFIGURE SELECTED ITEM' button, and click the 'RESET' button.

3. 3

   Clear Codes

   Clear the inactive 19063 fault code from the Engine ECU.

4. 4

   Validation Run

   Run the machine under load (using a dynamometer, hydraulic flow meter, or field operation) until the SCR upstream temperature sensor reads 300 - 330 °C (572 - 626 °F). Maintain this temperature for approximately 30 minutes to verify the repair and ensure the SCR system is dosing correctly.