Case IH 523455 - 31 - CSM – Transmission Control Unit (TCU) / Cab Suspension Module (CSM): Message ZFSL1 invalid or timed out

The Shift Lever message is missing or providing wrong signals over the CAN bus, resulting in a Transmission Shutdown operating mode.

• MAGNUM AFS Connect
• AFS Connect Magnum 180
• AFS Connect Magnum 200
• AFS Connect Magnum 220
• AFS Connect Magnum 240
• AFS Connect Magnum 250
• AFS Connect Magnum 280
• AFS Connect Magnum 310
• AFS Connect Magnum 340
• AFS Connect Magnum 380

1. 1

   Check the CAN Bus: Verify the communication network integrity between the vehicle controller and the transmission/shift lever.

2. 2

   Check the Shift Lever: Test the shift lever to ensure it is sending the correct output signals and is not timing out.

1. 1

   Inspect CAN bus wiring

   Inspect the physical CAN bus wiring harness connecting the shift lever to the vehicle's control modules for chafing, corrosion, or loose pins.

2. 2

   Test shift lever signal

   Test the shift lever's signal output using a diagnostic tool to see if the ZFSL1 message is being broadcast.

3. 3

   Replace shift lever

   If the wiring is intact but the signal is missing or invalid, replace the defective shift lever.

4. 4

   Verify CSM software and communication

   If the issue is related to the Cab Suspension Module, verify the CSM software and CAN communication lines (CSM on AFS Connect Magnums runs software version 1.0.0.0).

5. 5

   Clear codes and test

   Clear the fault codes and perform a test operation to ensure the transmission shutdown mode is resolved and CAN communication is restored.