Case IH 3263 – Engine Control Unit (ECU) A-095: CAN C Bus off failure.

The Engine Control Unit (ECU) is capable of connecting to and communicating on three separate Controller Area Networks (CAN). The CAN Node C Bus serves as the main engine interface bus. The ECU provides an internal CAN termination resistor for the CAN Node C Bus and monitors the network. This fault code triggers when the ECU detects a complete communication failure ("bus off" state) on the CAN C network.

• Steiger T4B
• 240 Series Axial-Flow Combines
• 7240
• 8240
• 9240
• Puma Series Tractors
• A8000 Series Sugar Cane Harvesters
• A8800 Series Sugar Cane Harvesters

1. 1

   Check if the machine's battery has been connected to an external power supply (e.g., a jump starter or external charger), which can disrupt CAN voltages.

2. 2

   Verify that the machine's charging system and battery voltage are operating within normal parameters.

3. 3

   Inspect the CAN C Bus wire harness for shorts, open circuits, or damaged twisted-pair wires.

4. 4

   Check related transmission/clutch solenoids (if applicable to the specific model's drivetrain) for proper resistance (8 - 11 Ohms).

5. 5

   Evaluate the Central Control Unit (CCU) and ECU A-095 for internal hardware or software faults.

1. 1

   Disconnect External Power

   If an external power supply is currently connected to the tractor/combine, disconnect it immediately and test the system for normal operation.

2. 2

   Test Battery/Charging System

   Ensure the battery voltage is correct. If the voltage is out of spec, repair the charging system first.

3. 3

   Test Solenoids

   If battery voltage is okay, test the resistance of the clutch solenoids. If the resistance is not between 8 - 11 Ohms, remove and replace the faulty solenoid.

4. 4

   Inspect and Repair Wiring

   Trace the CAN C Bus wiring harness. Repair any damaged wires or connectors causing a short or open circuit on the network.

5. 5

   Software Flash

   If the wiring and power supply are intact, the issue may be a software fault within the ECU A-095. Use the Electronic Service Tool (EST) to check the fault status and re-flash the ECU A-095 with the appropriate software if necessary.

6. 6

   Replace ECU

   If the ECU A-095 cannot be re-flashed, or if the internal CAN termination resistor/power stage has failed, remove and replace the ECU A-095.