Case IH 17581 (F-518256-19) - ECU – Engine Control Module (ECM) / ECU A-095: CAN message corruption between vehicle controller and ECM controller - TSC1_VR message

The Engine Control Module is receiving an invalid, corrupted, or timed-out CAN bus signal from the machine/vehicle controller regarding the engine brake command (TSC1_VR message).

• VESTRUM CVX
• Stage V MR (Medium Range) Tractors
• 240 Series Axial-Flow Combines

1. 1

   Check for other active vehicle CAN faults, as they may be the root cause of the message corruption and must be resolved first

2. 2

   Inspect wiring harnesses and connectors at the ECM and vehicle controller for damaged, bent, or dislocated pins, corroded terminals, or broken wires

3. 3

   Perform a flex test on the involved wiring harnesses while operating the machine or observing a diagnostic monitor to reveal intermittent breaks or shorts

4. 4

   Check the ECU A-095 supply voltage by disconnecting the vehicle harness at connector X-911 and measuring voltage on the harness side with the ignition ON

5. 5

   Perform a continuity and short-to-ground check on connector X-911 (from pin 19, wire 1930 WH to chassis ground and all other pins) with the ignition OFF

1. 1

   Repair Wiring

   If the visual inspection or continuity checks reveal a short to ground, open circuit, or damaged pins, repair or replace the affected section of the wiring harness or connector.

2. 2

   Software Verification

   If the wiring is intact, the voltage is correct, and the fault has not been resolved, verify that the appropriate software version is installed on the ECU A-095. Reinstall or reflash the ECU software if necessary.

3. 3

   Module Replacement

   If the wiring harness is completely verified, the software is up to date, and the CAN message corruption persists, the ECU A-095 (Engine Control Module) or the vehicle controller itself may have an internal failure and will need to be replaced.