Case IH 3407 – EDC (Electronic Diesel Control) / Engine ECU: CAN Bus: Timeout Error of CAN-Transmit-Frame EDC to NOx Sensor

Communication failure on the Controller Area Network (CAN) bus. Specifically, the Engine Control Unit is not receiving the expected data frames from the NOx sensor within the required time limit. The missing data packet (EDC2NOx) contains critical parameters for the SCR system.

• Magnum 180
• Magnum 190
• Magnum 210
• Magnum 225
• Magnum 235
• Magnum 260
• Magnum 290
• Magnum 315
• Magnum 340
• Magnum 370
• Steiger 350
• Steiger 400
• Steiger 450
• Steiger 500
• Steiger 550
• Steiger 600
• Quadtrac 450
• Quadtrac 500
• Quadtrac 550
• Quadtrac 600
• Farmall 100A
• Farmall 110A
• Farmall 120A
• Farmall 130A
• Farmall 140A
• Farmall 150A
• Farmall 170A
• Maxxum
• Puma
• Axial-Flow 5130
• Axial-Flow 6130
• Axial-Flow 7130
• Axial-Flow 7230
• Axial-Flow 8230
• Axial-Flow 9230
• Patriot 2240
• Patriot 4430
• Titan 3030
• Titan 3530
• Titan 4030
• Titan 4530
• 521F
• 621F
• 721F
• 821F
• 921F
• 1021F
• 1121F

1. 1

   Inspect the CAN bus wiring harness between the EDC and the NOx sensor control module for chafed wires, melted insulation from exhaust heat, or rodent damage.

2. 2

   Disconnect the NOx sensor plug (5-pin MCON connector) and check for pushed-out pins, water intrusion, or corrosion.

3. 3

   Verify that the NOx sensor is receiving proper voltage and has a solid ground, as a lack of power will cause the sensor to drop off the CAN bus.

4. 4

   Look for other SCR/NOx codes (e.g., 3529, 3530, 3533). If multiple CAN components are timing out, the issue is likely in the main CAN backbone rather than the sensor itself.

1. 1

   Preparation

   Turn off the machine, remove the key, and disconnect the battery to prevent electrical shorts. Allow the exhaust system to cool completely.

2. 2

   Locate the Sensor

   Locate the faulty NOx sensor on the exhaust system (note whether it is the upstream or downstream sensor, as they have different part numbers and cable lengths).

3. 3

   Disconnect Electrics

   Unplug the electrical connector from the NOx sensor's control module box. Unbolt the control box from its mounting bracket.

4. 4

   Remove the Probe

   Use a specialized NOx/O2 sensor socket or a wrench to unscrew the sensor probe from the exhaust pipe. Tip: Apply penetrating oil if the sensor is seized to avoid stripping the exhaust bung threads.

5. 5

   Install the New Sensor

   Thread the new NOx sensor probe into the exhaust pipe by hand to prevent cross-threading, then tighten to the manufacturer's torque specification.

6. 6

   Mount and Route

   Secure the new sensor's control module to the mounting bracket. Route the wiring harness exactly as it was from the factory, ensuring it is secured away from extreme heat sources.

7. 7

   Reconnect

   Plug in the electrical connector and reconnect the battery.

8. 8

   Clear Codes and Calibrate

   Connect a diagnostic tool (such as the CNH Electronic Service Tool) to clear the inactive 3407 fault code. Some systems require a reset or calibration routine to initialize the new NOx sensor on the CAN bus.

9. 9

   Test Run

   Run the engine up to operating temperature to ensure the SCR system engages and the fault code does not return.