Case IH 522839-02 - PCM – PCM: CAN-4 data erratic, intermittent or incorrect.

This indicates a communication failure on the CAN-4 (Controller Area Network 4) bus. The control module is detecting unstable, missing, or corrupted data packets on this specific network branch. Depending on the machine's architecture, CAN-4 is typically utilized for the Implement Bus (operating at 250 kbps) or for specific engine/emissions communications (such as ECU to D-NOX module communication).

• MAGNUM AFS Connect
• Magnum AFS Connect series (Models 250, 280, 310, 340, 380, 400)
• Steiger and Quadtrac AFS Connect series
• Austoft 9900 Cane Harvesters
• Older Case IH models retrofitted with the Case IH Pro 1200 Guidance Kit

1. 1

   Visually inspect the CAN-4 wiring harness for chafing, pinched wires, or loose connections.

2. 2

   Check the CAN-4 High and CAN-4 Low pins for proper voltage and continuity. On standard diagnostic/implement connectors, these are often located at Pin H (CAN 4 HI) and Pin J (CAN 4 LO), or Pins 23 and 24 depending on the specific harness interface.

3. 3

   Verify that the CAN network terminators (resistors) are intact and functioning properly, as missing or failed terminators will cause erratic data.

4. 4

   Connect the Case IH Electronic Service Tool (EST) to verify the PCM software version and check if any specific nodes on the CAN-4 network are dropping offline.

1. 1

   Isolate the Fault

   Connect the Electronic Service Tool (EST) to the machine's diagnostic port. Read the bus statistics to determine if the erratic data is caused by a specific implement/module on the CAN-4 bus or the wiring itself.

2. 2

   Harness Repair

   If continuity tests reveal an open circuit, short to ground, or short to power on the CAN-4 lines, repair or replace the affected section of the wiring harness.

3. 3

   Module Replacement

   If the wiring, terminators, and connected modules test good but the PCM still fails to process CAN-4 data, the PCM itself has an internal hardware fault and must be replaced.

4. 4

   Reprogramming

   If the PCM is replaced, it must be programmed. Use the EST base software to copy the complete program files for the display and the new PCM onto a USB memory device. Insert the USB drive into the display to flash and configure the new PCM.