Case IH 3329 – Engine Controller: Timeout of CAN Message TSC1-AR (When Active)

The engine controller is expecting to receive this specific torque/speed control message over the CAN bus while the system is active, but the message is missing or taking too long to arrive (timeout). This indicates a communication breakdown between the sending module and the engine controller.

• Case IH Magnum 235 - 340 (Series 4)
• Case IH Steiger
• Case IH Puma
• Case IH Maxxum
• Case IH Optum

1. 1

   Check for multiple CAN timeout codes (e.g., 3330, 3331, 3332) to determine if the entire CAN bus is down or if the issue is isolated to a specific sending module.

2. 2

   Disconnect the battery and measure the resistance across the CAN_H and CAN_L pins at the diagnostic port (should read exactly 60 ohms).

3. 3

   With the system powered on, check the voltage on the CAN lines (CAN_H should be slightly above 2.5V, CAN_L slightly below 2.5V) to rule out shorts to ground or power.

4. 4

   Verify that the sending module (e.g., Armrest controller) is receiving proper 12V power and has a clean ground connection.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical damage during testing.

2. 2

   Inspect Connectors

   Locate the wiring harness connectors between the Engine ECU and the Armrest/Transmission controllers. Disconnect them and inspect for pushed pins, corrosion, or moisture ingress.

3. 3

   Trace the Harness

   Visually inspect the CAN bus wiring harness for chafing, cuts, or pinch points, particularly where the harness routes under the cab or near pivot points.

4. 4

   Repair Wiring/Resistors

   If a short or open circuit is found during the diagnostic checks, repair the damaged wire. If the terminating resistance was 120 ohms instead of 60 ohms, locate and replace the failed CAN terminating resistor.

5. 5

   Module Replacement/Update

   If the wiring, voltages, and resistors all test perfectly, the fault lies internally within either the sending module (failing to broadcast the TSC1-AR message) or the Engine ECU (failing to receive it). A dealer diagnostic tool (like CNH EST) will be required to verify module software status or program a replacement module.

6. 6

   Clear and Test

   Reconnect the battery, clear the stored fault codes, and operate the tractor to ensure the code does not return.