Case IH 520202-22 - VCM – VCM: Auxiliary steering device never received (boot-up timeout)

Loss of communication over the CAN bus. The steering valve controller is not receiving the expected CAN messages from the auxiliary steering device (such as the AFS auto-guidance module) during the system's boot-up sequence.

• MAGNUM AFS Connect
• Case IH Steiger Series (e.g., 370, 470, 715 Quadtrac)
• Case IH Magnum Series
• Case IH Optum Series
• Case IH Puma Series

1. 1

   Verify the auxiliary steering device is receiving adequate power (minimum 9V required; 12V/24V nominal) and check for blown fuses in the chassis supply or EHS central box.

2. 2

   Inspect the CAN Bus wiring between the auxiliary steering device and the PVED-CLS controller for disconnected plugs, broken wires, or corroded pins.

3. 3

   Check if the parameter setting of the auxiliary source address is incorrect, which can cause the PGN message to be lost or time out.

1. 1

   Power down system

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

2. 2

   Inspect wiring and connectors

   Locate the PVED-CLS steering valve controller and the auxiliary steering module. Disconnect the CAN bus harness connectors and inspect the pins for corrosion, moisture, or pushed-back terminals.

3. 3

   Test CAN bus continuity

   Use a multimeter to test the continuity of the CAN_H and CAN_L lines between the auxiliary steering device and the VCM/PVED-CLS controller. Repair or replace any damaged sections of the wiring harness.

4. 4

   Restore power and test

   Reconnect the connectors and the battery. Turn the ignition on to initiate the boot-up sequence.

5. 5

   Verify software parameters

   Connect the Case IH Electronic Service Tool (EST). Verify that the AUX source address parameters are correctly configured in the VCM.

6. 6

   Clear codes and test drive

   Clear the 520202-22 fault code and perform a steering check valve test and a short test drive to ensure the auto-guidance system communicates properly and the code does not return.

7. 7

   Replace control module

   If the wiring is perfectly intact, power is verified, and the code immediately returns on boot-up, the PVED-CLS controller or the auxiliary steering module has an internal failure and must be replaced.