Case IH 1024 – Hitch Controller: ICU CAN data bus signal lost.

The Implement Control Unit (ICU) has lost communication with the rest of the tractor's Controller Area Network (CAN) data bus. The system is unable to send or receive messages from this module, which typically results in a loss of electronic hitch control and related automated functions.

• Magnum
• Magnum 235-340 (Series 4)
• MX170
• MX180
• MX210
• MX240
• Steiger 9310
• Steiger 9330
• Steiger 9350
• Steiger 9370
• Steiger 9380
• Steiger 9390
• Quadtrac 9310
• Quadtrac 9330
• Quadtrac 9350
• Quadtrac 9370
• Quadtrac 9380
• Quadtrac 9390
• Puma
• Maxxum
• Optum

1. 1

   Inspect the CAN bus wiring harness for chafing, cuts, or corrosion, paying special attention to wiring under the cab and connectors at the Hitch Controller.

2. 2

   Verify that the Hitch Controller is receiving proper 12V switched power, unswitched power, and has a clean chassis ground.

3. 3

   Using a multimeter, check the voltage on the CAN High (Yellow) and CAN Low (Green) wires (both should read approximately 2.4V to 2.5V).

4. 4

   With the tractor turned off and battery disconnected, measure the resistance across the CAN High and CAN Low pins (should read exactly 60 ohms; 120 ohms indicates a failed resistor/open circuit, 0 ohms indicates a short).

5. 5

   Disconnect controllers on the CAN network one by one; if communication is restored after unplugging the Hitch Controller, it has an internal short.

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Access the Module

   Locate the Hitch Controller/ICU (location varies by model, but is typically found under the cab floor, behind the right-hand console, or integrated near the armrest).

3. 3

   Repair Wiring/Terminators

   If diagnostic checks revealed a wiring fault or a bad terminating resistor, repair the broken wires using OEM-approved splice kits or replace the CAN termination module.

4. 4

   Replace the Controller

   If power, ground, and CAN bus resistance are all within spec but the module will not communicate, the Hitch Controller has failed internally. Unplug the Deutsch connectors, unbolt the module, and install the replacement unit.

5. 5

   Reassemble and Clear Codes

   Reconnect the battery. Use a diagnostic service tool or DTC eraser to clear the 1024 fault code from the system memory.

6. 6

   Calibration

   Perform a hitch calibration procedure as outlined in the specific model's service manual, as the new controller will need to learn the travel range and drop rate limits of the draft pins and potentiometers.