Case IH F-1648-12 - ECU – Engine Control Module (ECM): ECU internal failure - 'WDA active' reported due to errors in query/response communication

A fatal internal hardware or software failure within the control module where internal Level 2/3 monitoring has detected a breakdown in its internal query/response communication, triggering a 'WDA active' (Watchdog Active) fail-safe state.

• MAGNUM AFS Connect
• Case IH Steiger Tractors
• Case IH Farmall Tractors (40, 45, 50 CVT)
• Case IH 240 Series Combines
• Case IH SR175 Skid Steer Loaders
• TC5090 Combines

1. 1

   Connect the Electronic Service Tool (EST), clear the fault code, cycle the key, and restart the engine to check if it was a temporary internal SPI error.

2. 2

   Check the machine's battery voltage and the wiring harness supplying power and ground to the ECM, as unstable power can trigger internal ECU faults.

3. 3

   Ensure the ECM connectors are secure, fully seated, and free of moisture or corrosion.

1. 1

   Disconnect battery

   Turn off the machine and disconnect the negative battery cable.

2. 2

   Locate ECM

   Locate the Engine Control Module (ECM) on the engine block or firewall.

3. 3

   Disconnect ECM connectors

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

4. 4

   Remove ECM

   Remove the mounting bolts securing the ECM to its bracket and remove the defective unit.

5. 5

   Install replacement ECM

   Install the replacement ECM and tighten the mounting bolts.

6. 6

   Reconnect ECM connectors

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

7. 7

   Reconnect battery

   Reconnect the negative battery cable.

8. 8

   Program ECM

   Connect the Case IH Electronic Service Tool (EST). You must flash the correct dataset/calibration for the specific machine and follow the appropriate service tool procedure to 'Restore Self Learning Parameters'.