Case IH 3185 – Engine Control Unit (ECU) A-095: CAN timeout error from the transmission regarding the Transmission Fluids (TF) message

The control module senses a message timeout for proprietary Transmission Fluids (TF) information over the Controller Area Network (CAN) bus.

• Steiger T4B
• Case IH Puma Series (165, 180, 195, 210, 225 CVX)
• Case IH Magnum Series 4 (235 - 340)
• Case IH 240 Series Axial-Flow Combines

1. 1

   Check for active CAN faults: Verify if there are any other related vehicle CAN faults active. If other CAN faults exist, they must be resolved first.

2. 2

   Check ECU Supply Voltage: If no other CAN faults exist, check the supply voltage to the ECU A-095.

3. 3

   Connector X-911 Test: Disconnect the vehicle (VE) harness from the ECU A-095 at connector X-911. With the ignition switch in the ON position, use a multimeter to check for proper voltage and ground on the vehicle harness side.

4. 4

   Wiring & Resistor Inspection: Test the CAN circuit wiring for open circuits, shorts to ground, or short circuits. Verify that the CAN termination resistors are present and functioning correctly.

1. 1

   Resolve Network Issues

   Address any other active CAN bus error codes first, as fixing the network communication often resolves the 3185 timeout error.

2. 2

   Inspect Wiring Harness

   Visually and physically inspect the wiring harness between the transmission controller and the ECU A-095. Look for chafed wires, corroded pins at connector X-911, or loose grounds. Repair or replace damaged wiring.

3. 3

   Verify Power/Ground

   Ensure the ECU A-095 is receiving proper supply voltage and has a solid ground connection.

4. 4

   Test/Replace Modules

   If the wiring, voltage, ground, and termination resistors all test within specification, the communication failure is internal to a module. The fault lies with either the ECU A-095, the Central Control Unit (CCU), or the Universal Control Module (UCM) failing to broadcast or receive the TF message. Replace the faulty module and re-flash/calibrate the software as required by the OEM service manual.