Case IH 3754 (F-5313-02) - ECU – Engine Control Unit (ECU): ECU internal failure - Rail pressure plausibility

This is a Level 2 Monitoring diagnostic fault indicating that the engine's control module has detected an internal calculation, logic, or monitoring error regarding the plausibility of the high-pressure fuel rail data. The computer's internal safety monitoring for the fuel rail pressure has failed or detected an impossible internal state.

• VESTRUM CVX
• Skid Steer Loaders (SSL)
• Compact Track Loaders (CTL)
• Farmall 40
• Farmall 45
• Farmall 50
• Farmall 115U
• 7240 Axial-Flow Combine
• 8240 Axial-Flow Combine
• 9240 Axial-Flow Combine

1. 1

   Check for accompanying codes related to the fuel rail pressure sensor itself (such as code 3766). If sensor voltage or wiring codes are present, diagnose those first.

2. 2

   Verify actual fuel pressure using an external mechanical pressure gauge to ensure the actual fuel pressure is within specification and not fluctuating wildly due to a failing high-pressure pump or regulator.

3. 3

   Check ECU Power/Grounds to ensure the ECU is receiving clean voltage, as voltage drops or spikes can cause internal processing errors.

1. 1

   Connect diagnostic tool

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

2. 2

   Reload the Engine Dataset

   Attempt to reflash/update the ECU software with the latest dataset. Software glitches are a known cause of Level 2 Monitoring plausibility faults.

3. 3

   Clear codes and test

   Clear the fault codes and test run the engine to see if the fault persists.

4. 4

   Replace the Engine Controller

   If fault code 3754 returns after the engine dataset has been reloaded, the EDC has suffered an unrecoverable internal hardware/memory failure and must be replaced.

5. 5

   Install new module

   Install the new EDC module.

6. 6

   Program new module

   Use the EST to restore the self-learning parameters and program the new module to the machine.