Case IH 3238 – Engine Control Module (ECM): Replace Engine Controller (Internal Communication Chip Error) - CJ940

Internal hardware defect or electrical disturbance inside the engine controller that has caused a failure in the SPI (Serial Peripheral Interface) bus communication with the CJ940 processor.

• Farmall
• skid steer
• Magnum Tractors 235 - 340 (Series 4)
• STX Steiger Tractors 350 to 600 HP models
• 580 Super N Backhoe Loaders
• Skid Steer Loaders (SSL)
• Compact Track Loaders (CTL)

1. 1

   Cycle the machine's power to see if the code is an active, hard fault or a stored historical code caused by a temporary electrical disturbance.

2. 2

   Attempt to clear the code. If the fault code remains active and cannot be cleared, the internal CJ940 processor has failed, and the module itself is condemned.

1. 1

   Replace the Engine Controller

   Disconnect the battery, remove the engine harnesses from the ECM, and physically replace the Engine Control Module.

2. 2

   Restore Parameters

   Connect the Case IH Electronic Service Tool (EST) laptop to the machine's diagnostic port to flash the new ECM (if it is a blank programmable unit) and restore the engine's self-learning parameters and injector calibrations.