Case IH 3184 (F-518667-09) - ECU – ECU A-095: CAN communication failure between the vehicle controller and the ECU controller (TSC1_VR message)

The Engine Control Unit (ECU) is either not receiving the expected engine brake command message from the vehicle/machine controller over the CAN bus, or the message data is corrupted/invalid.

• VESTRUM CVX
• Case IH 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Case IH Magnum Series Tractors
• Case IH Steiger Series Tractors

1. 1

   Check for other active CAN faults: If other vehicle CAN faults exist (e.g., CAN Bus off failure, BC2ECU2 message failures), resolve those first, as a broader CAN bus failure will trigger this specific message loss.

2. 2

   Check for external power supplies: Verify that the machine's battery power supply has not been connected to an external power supply (like a jump box or external charger). If connected, disconnect it and test the system for normal operation.

3. 3

   Check ECU A-095 supply voltage: Turn the ignition switch to the OFF position, disconnect the vehicle (VE) harness from the ECU A-095 at connector X-911, turn the ignition switch to the ON position, and use a multimeter to check for proper battery voltage on the vehicle harness side of the connector.

4. 4

   Check for shorts to ground: With the ignition OFF and connector X-911 disconnected, use a multimeter to perform a continuity check from X-911 pin 19 (wire 1930 WH) to chassis ground, and to all other pins. There should be no continuity.

5. 5

   Visual Inspection: Inspect the harnesses and connectors (especially X-911) for damaged, bent, or pushed-back pins, corroded terminals, or broken wires. Flex the harnesses while observing the monitor to check for intermittent breaks or shorts.

1. 1

   Clear External Interference

   Disconnect any external power supplies or aftermarket CAN devices that might be corrupting the bus traffic.

2. 2

   Repair Wiring/Connectors

   If the continuity tests reveal a short to ground or an open circuit in the CAN lines or power supply lines, repair or replace the affected section of the vehicle harness.

3. 3

   Clean and Reseat

   If no wiring damage is found, thoroughly clean the pins on connector X-911 and the ECU header with contact cleaner. Reconnect and ensure the connector is fully seated and locked.

4. 4

   Software Flash

   If the wiring is intact and the fault persists, the ECU A-095 software may be corrupted. Have a dealer technician verify the appropriate software version is present and reinstall/flash the ECU software using the Electronic Service Tool (EST).

5. 5

   Replace the ECU

   If all wiring, voltage, and software checks pass but the ECU still cannot process the TSC1_VR CAN message, the ECU A-095 has suffered an internal hardware failure and must be replaced.