Case IH 2202 – ZDC: ZDC - CAN message TSC1_VER timeout

Communication failure on the tractor's CAN bus where the transmission controller (ZDC) did not receive the required engine speed/torque broadcast (TSC1_VER) from the Engine Control Module (ECM) or Vehicle Control Module (VCM) within the programmed timeframe.

• Steiger T4B
• Case IH Steiger series (e.g., 420, 435)
• Case IH Magnum CVT series (e.g., 380 CVT)
• Case IH Puma CVX series (e.g., 165 CVX)
• Case IH Maxxum CVX series (e.g., 145 CVX, 150 CVX)

1. 1

   Check tractor voltage supply to ensure sufficient voltage, as low voltage can cause modules to drop off the CAN bus.

2. 2

   Inspect all ground connections to ensure they are clean, tight, and free of corrosion.

3. 3

   Test CAN terminators by checking the resistance across the CAN High and CAN Low pins (should typically read 60 ohms with the battery disconnected).

4. 4

   Check for accompanying CAN timeout codes (such as VCM2EDC or BC2EDC2) which may indicate a physical break in the CAN backbone rather than a single module failure.

1. 1

   Power down tractor

   Turn off the tractor and disconnect the battery to prevent electrical spikes during testing.

2. 2

   Inspect wiring harness

   Trace the CAN bus wiring harness between the ZDC (CVT controller) and the Engine Control Module. Look for chafing, pinched wires, or melted insulation.

3. 3

   Clean connectors

   Disconnect the harness connectors at the ZDC and the ECM. Inspect the pins for pushed-back terminals, moisture, or corrosion. Clean with electrical contact cleaner and apply dielectric grease.

4. 4

   Replace CAN terminators

   If the CAN terminators test out of specification, replace them. For Steiger models, install the updated terminator available from the dealer.

5. 5

   Test modules with diagnostic tool

   If wiring, grounds, and terminators are good, use a dealer diagnostic tool (like the CNH EST) to monitor live CAN traffic and determine if the ZDC or ECM is failing to process or send the signal.