Case IH 17579 (F-518254-14) - ECU – Engine Control Unit (ECU): CAN message corruption between vehicle controller and ECU controller - TSC1_VE message

This code is triggered when the engine controller receives an invalid value or loses communication with the machine/vehicle controller over the CAN bus network.

• VESTRUM CVX
• Puma 140
• Puma 155
• Puma 170
• Puma 180
• Puma 200
• Puma 240
• Magnum 180
• Magnum 200
• Magnum 220
• Magnum 240
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum 380
• Steiger 370
• Steiger 420
• Steiger 470
• Steiger 500
• Steiger 620
• Farmall 40-45-50
• Farmall 115U
• Farmall 120A
• Axial-Flow 7240
• Axial-Flow 8240
• Axial-Flow 9240

1. 1

   Inspect the CAN bus wiring (specifically CAN Node A Bus) between the Vehicle Control Module (VCM) and the Engine Control Unit (ECU) for chafing, open circuits, or short circuits to ground/power.

2. 2

   Verify the integrity of the CAN termination resistors. Measure the resistance across the CAN High and CAN Low pins to ensure it is within specification (typically 60 ohms with the battery disconnected).

3. 3

   Check battery voltage and ground connections to both the ECU and the VCM to rule out voltage drops causing communication dropouts.

4. 4

   Connect the CNH Electronic Service Tool (EST) to check live parameters, read/clear fault codes, and verify if the ECU is receiving the TSC1_VE message from the vehicle controller.

1. 1

   Disconnect power

   Disconnect the battery negative terminal before performing any electrical repairs or module replacements.

2. 2

   Repair wiring

   If the diagnostic checks reveal damaged CAN bus wiring or corroded connectors between the VCM and ECU, repair or replace the affected harness section.

3. 3

   Test with known good module

   If the wiring is intact but communication fails (or if the internal ECU termination resistor has failed), the issue is likely a defective ECU or VCM. If possible, test with a known good controller to isolate the faulty module.

4. 4

   Replace faulty module

   If the ECU is deemed faulty, remove the defective unit and install the replacement ECU.

5. 5

   Program and calibrate

   After replacing the ECU, connect the CNH EST diagnostic software. You must program the new ECU, configure the vehicle parameters, and write the correct injector codes.

6. 6

   Clear codes and test

   Clear all stored fault codes and perform a test run to ensure the TSC1_VE communication is restored and the tractor operates without entering limp mode.