Case IH 3745 – Engine ECU / EDC: EDC - Power stages, Injector: Diagnostic fault check to report that WDA is not working correct.

Internal hardware/software failure within the engine's computer. The ECU detects that the internal watchdog timer (WDA) monitoring the fuel injector power stages is failing to respond or operate correctly.

• Farmall
• skid steer
• Magnum
• Steiger
• Maxxum
• MXM series
• MXU series
• SSL skid steers
• CTL compact track loaders
• 580ST

1. 1

   Check for companion codes: Look for other injector system Diagnostic Fault Checks (DFCs). If code 3745 is stored without any other external wiring or injector system faults, the ECU is definitively defective.

2. 2

   Inspect the main engine harness connection at the ECU for corrosion, pushed-out pins, or water intrusion, which can cause internal communication shorts.

3. 3

   Clear the code and cycle the key. If the code immediately returns upon the self-check, the module's internal ROM or power stage is permanently damaged.

1. 1

   Replace the Engine Controller

   Remove the defective EDC/ECU from the machine.

2. 2

   Install the New Module

   Mount and plug in the replacement EDC.

3. 3

   Restore Parameters

   Connect the Case IH Electronic Service Tool (EST) and follow the appropriate service tool procedure to restore the machine's self-learning parameters, injector trim codes, and immobilizer sync.