Case IH 3783 – Engine Control Unit (ECU) / EDC (Electronic Diesel Control): Diesel particulate filter (DPF) : Fault path for maximum number of locked regenerations for HD

The engine control system has attempted to initiate a DPF regeneration, but the process was locked, prevented, or aborted too many times. This is typically caused by vehicle use/ambient conditions, a sensor plausibility fault, or catalyst failure.

• tractors
• combines
• sprayers

1. 1

   Review operator habits to determine if the machine has been idling excessively or operating under very light loads, which prevents the exhaust from getting hot enough to regenerate

2. 2

   Using a diagnostic tool (CNH EST), monitor live data for the pre-DOC and pre-DPF exhaust gas temperature sensors to check for plausibility and artificially low readings

3. 3

   Evaluate the Diesel Oxidation Catalyst (DOC) to see if it is degraded, face-plugged, or failing to catalyze fuel if sensors are reading correctly but temperatures do not increase

1. 1

   Resolve the Root Cause

   If the issue was operator habit/low load, no parts need to be replaced. If a temperature sensor is reading out of range or shorting, replace the faulty sensor. If the DOC is failing to heat up the exhaust, the DOC/DPF assembly may require professional cleaning or replacement.

2. 2

   Perform a Forced Regeneration

   Connect the CNH EST diagnostic laptop and command a manual/stationary forced regeneration to clear the soot load.

3. 3

   Clear Codes

   Once the forced regeneration completes successfully and the soot mass is reduced, clear the inactive 3783 fault code from the EDC.