Case IH 3738 – Engine Control Module (ECM) / Electronic Diesel Control (EDC): Analog Digital Converter (ADC) diagnostic fault check reporting multiple errors while checking the complete ROM-memory

A critical internal memory failure within the engine's computer where the system is unable to properly read its own Read-Only Memory, preventing the controller from reliably managing engine parameters.

• skid steer
• SR220
• SR250
• SV250
• SV300
• TR320
• TV380
• Farmall 90
• Farmall 100
• Farmall 110
• Farmall 115U Pro EP
• 580N
• 580SN
• 590SN
• 586H

1. 1

   Check battery and charging voltage for stability, as severe spikes or drops can cause temporary memory read errors in the EDC.

2. 2

   Inspect EDC main wiring harness connectors to verify they are clean, tight, and free of corrosion or water intrusion.

3. 3

   Cycle the machine's power and attempt to clear the code using the Case IH Electronic Service Tool (EST) to see if it immediately returns upon key-on.

1. 1

   Reprogram the EDC

   Connect the Case IH Electronic Service Tool (EST) and attempt to flash/reprogram the engine controller with the latest software dataset.

2. 2

   Re-evaluate

   Cycle the key and check if fault code 3738 returns.

3. 3

   Replace the Controller

   If the fault persists after reprogramming, the ROM chip inside the EDC is physically damaged. You must replace the Engine Controller.

4. 4

   Restore Parameters

   If the EDC is replaced, you must use the EST to follow the appropriate service tool procedure to restore the engine's self-learning parameters (such as injector trim codes and pump calibrations) to the new module.