Case IH F-3216-14 - ECU – ECM / ACM: NOx Sensor Up Stream - Sensor value implausible as compared to the software model

The upstream Nitrogen Oxide (NOx) sensor is providing a reading that drifts or deviates significantly from the expected values generated by the engine's software model, or the sensor has failed its internal self-diagnostic checks.

• MAGNUM AFS Connect
• Magnum 180
• Magnum 200
• Magnum 220
• Magnum 240
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Puma 150
• Puma 165
• Puma CVX 130-170
• Farmall 110A
• Farmall 120A
• Farmall 130A
• Farmall 140A
• Farmall 115U
• Axial-Flow 5140
• Axial-Flow 6140
• Axial-Flow 7140
• Axial-Flow 7240
• Axial-Flow 8240
• Axial-Flow 9240
• Patriot 2250
• Patriot 3240
• Patriot 3340
• Patriot 4440
• Titan 3040
• Titan 3540
• Titan 4040
• Titan 4540

1. 1

   Inspect the wiring harness and connector for the upstream NOx sensor for short circuits to ground or power, and verify battery voltage (high resistance or voltage drops can cause communication errors).

2. 2

   Check for exhaust leaks upstream of the NOx sensor, as unmetered air entering the exhaust stream can skew sensor readings and cause the implausible value error.

3. 3

   Verify if there are any pending software updates for the ECM/ACM, as the sensor is compared to a software model which may require recalibration.

1. 1

   Turn off machine and disconnect battery

   Turn off the machine and disconnect the battery to prevent electrical shorts.

2. 2

   Locate upstream NOx sensor

   Locate the upstream NOx sensor on the exhaust pipe, positioned just before the inlet of the SCR catalytic converter.

3. 3

   Disconnect electrical connector

   Disconnect the electrical connector for the NOx sensor control module.

4. 4

   Unscrew sensor probe

   Carefully unscrew the sensor probe from the exhaust pipe.

5. 5

   Install new NOx sensor

   Install the new NOx sensor into the exhaust pipe (thread size is typically M20 x 1.5).

6. 6

   Mount control module and route cable

   Mount the sensor's control module securely and route the cable (typically ~608mm to 615mm long) away from extreme heat sources.

7. 7

   Reconnect connector and battery

   Reconnect the electrical connector and the machine's battery.

8. 8

   Clear fault code

   Use a diagnostic scan tool to clear the F-3216-14 fault code from the ECM/ACM.

9. 9

   Perform SCR system test

   Run the machine and perform an SCR system test or regeneration to verify the new sensor is reading correctly and the code does not return.