Case IH F-518145-09 - ECU – Engine Control Unit (ECU): ECU internal failure - Loss of synchronization to MM from CPU

Every time the ignition key is turned ON, the ECU performs a shut-off path test of the fuel injection power stages to verify the correct functioning of the engine shut-off procedure. If the CPU and the Monitoring Module (MM) lose synchronization during this boot-up test or during standard operation, the system flags an internal processing failure.

• MAGNUM AFS Connect
• Case IH Magnum AFS Connect Series
• Magnum 340
• Magnum 400 AFS Connect
• Case IH 240 Series Axial-Flow Combines
• Other Case IH and New Holland equipment utilizing the A-9000 Engine Control Unit

1. 1

   Cycle the Ignition: Because the synchronization test runs every time the key is turned ON, a simple key cycle may clear a transient software glitch.

2. 2

   Check Battery and Grounds: Low voltage during cranking or boot-up can cause the CPU and MM to fall out of sync. Verify the battery is fully charged and inspect the main chassis grounds and the specific ground pins at the ECU harness.

3. 3

   Inspect ECU Connectors: Check the wiring harness connectors at the A-9000 ECU for moisture, corrosion, or backed-out pins that could cause momentary power interruptions.

4. 4

   Check for Software Updates: Connect the Case IH Electronic Service Tool (EST). Software bugs can sometimes cause false synchronization errors; flashing the ECU with the latest firmware payload may resolve the issue.

5. 5

   Active vs. Inactive: If the code remains active, cannot be cleared via the EST, and the engine is derated or refuses to start, the ECU has suffered a permanent internal hardware failure and must be replaced.

1. 1

   Disconnect battery

   Disconnect the machine's negative battery cable to prevent electrical shorts or arcing.

2. 2

   Locate ECU

   Locate the Engine Control Unit (A-9000) on the side of the engine block.

3. 3

   Disconnect ECU connectors

   Carefully release the locking levers on the wiring harness connectors and unplug them from the ECU.

4. 4

   Remove faulty ECU

   Remove the mounting bolts securing the ECU to its vibration-isolating bracket and remove the faulty module.

5. 5

   Install replacement ECU

   Install the replacement ECU and torque the mounting bolts to OEM specifications.

6. 6

   Reconnect ECU connectors

   Reconnect the wiring harness connectors, ensuring the locking levers are fully seated and locked.

7. 7

   Reconnect battery

   Reconnect the negative battery cable.

8. 8

   Connect diagnostic tool

   Connect the Case IH Electronic Service Tool (EST) to the machine's diagnostic port.

9. 9

   Program ECU

   A new ECU is blank. You must use the EST to flash the ECU with the correct software payload matching the machine's Product Identification Number (PIN) and engine serial number.

10. 10

    Calibrate ECU

    Enter the specific fuel injector trim codes (found on the injectors) into the new ECU and perform any required system calibrations before starting the engine.