New Holland 3335 – ECM: Timeout Of CAN Message TSC1-PE Torque - When Inactive

The Engine Control Unit (ECU) failed to receive the expected J1939 CAN bus message 'TSC1-PE Torque' (Propulsion Engine) within a specific timeframe while inactive. This message acts as a continuous heartbeat signal from another controller (usually the Armrest Controller) to command engine speed and torque. The fault indicates a communication breakdown on the CAN bus network rather than an internal engine issue.

• T8.275
• T8.300
• T8.330
• T8.360
• T8.390

1. 1

   Visually inspect the CAN bus wiring harness for chafed, pinched, or corroded wires and connectors, particularly between the main/transmission controllers and the engine ECU.

2. 2

   Check battery voltage (should be above 12.1V) and ensure all power and ground connections to the relevant control modules are clean and tight to rule out voltage-drop induced ghost faults.

3. 3

   With power off and battery disconnected, measure resistance between CAN High (CAN_H) and CAN Low (CAN_L). A healthy bus reads approximately 60 Ohms. 120 Ohms indicates a missing terminating resistor or open circuit; significantly lower indicates a short.

4. 4

   With key on and engine off, measure DC voltage of each CAN line to chassis ground. CAN_H should be 2.5-3.0 Volts and CAN_L should be 2.0-2.5 Volts.

1. 1

   Isolate network nodes

   If CAN bus resistance or voltage readings are incorrect, disconnect modules from the CAN network one by one. Re-measure after each disconnection. The last module disconnected before readings normalize is likely the source of the fault.

2. 2

   Test terminating resistors

   If the total CAN bus resistance measured 120 Ohms, locate and test each of the two 120-Ohm terminating resistors individually. One is often in a control unit and the other plugged into the harness.

3. 3

   Inspect controller connectors

   Disconnect the suspected controller and inspect its connector pins for damage, corrosion, or loose terminals. Repair any poor connections that could cause intermittent data loss.

4. 4

   Verify controller configuration

   Use the New Holland Electronic Service Tool (EST) to verify that the engine ECU is correctly configured to receive the TSC1 message from the correct source controller (e.g., transmission or armrest controller).

5. 5

   Replace faulty module

   If a specific control module is identified as causing abnormal bus voltages or resistances, and the fault resolves when it is unplugged, replace the defective module.