Case IH 3340 – Engine Controller (ENG / Engine ECU / ECM): Timeout of CAN Message Time Date

Communication error on the Controller Area Network (CAN) bus where the control module is failing to receive the expected data packet containing the time and date from the master controller within the required timeframe.

• Magnum 180
• Magnum 200
• Magnum 225
• Magnum 235
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340 (Series 4)
• Magnum 380
• Patriot 3230
• Patriot 3330
• Patriot 3340
• Patriot 4430
• Steiger 370
• Steiger 420
• Steiger 470
• Steiger 500
• Steiger 540
• Steiger 580
• Steiger 620
• Quadtrac 370
• Quadtrac 420
• Quadtrac 470
• Quadtrac 500
• Quadtrac 540
• Quadtrac 580
• Quadtrac 620

1. 1

   Perform a system-wide scan using the CNH Electronic Service Tool (EST) to check if other modules are also missing CAN messages

2. 2

   Perform a CAN bus resistance test by disconnecting the battery and measuring resistance across CAN High and CAN Low pins at the diagnostic port (should read approximately 60 ohms)

3. 3

   Inspect the wiring harness between the Engine ECU and the cab controller for chafing, pinched wires, or moisture intrusion at the connectors

4. 4

   Verify proper voltage and a clean ground for the module responsible for sending the time/date message

1. 1

   Disconnect Power

   Turn off the key and disconnect the battery to prevent electrical damage while testing.

2. 2

   Locate the Break/Short

   If the resistance test failed, trace the CAN bus wiring harness from the Engine ECU toward the cab. Pay special attention to pivot points, areas near the engine block (heat damage), and bulkheads.

3. 3

   Repair Wiring / Connectors

   If a broken wire, corroded pin, or pushed-out connector is found, repair the harness using OEM-approved weather-pack connectors and wiring.

4. 4

   Check/Replace Terminating Resistors

   If the bus measures 120 ohms, locate the terminating resistors (often integrated into the ECU, the display, or plugged into the ends of the harness). Replace the faulty resistor if it is a standalone harness component.

5. 5

   Module Replacement (Last Resort)

   If the wiring, grounds, and resistors all test perfectly, the Engine ECU or the Cab Display/Controller has an internal CAN transceiver failure. Replace the faulty module.

6. 6

   Clear Codes

   Reconnect the battery, turn the key on, and use the CNH EST diagnostic software to clear the inactive 3340 fault code. Run the machine to verify the code does not return.