When working on a Cummins engine displaying DEF-related fault codes 1673 or 4769 (Aftertreatment DEF Tank Level) along with 3712 or 3714 (Aftertreatment SCR Inducement), follow the steps below to remove the engine derate condition:
- Refill the DEF Tank
Ensure the Diesel Exhaust Fluid (DEF) tank is filled to the proper level. - Clear Active Fault Codes
- Connect using TEXA IDC5.
- Start a diagnostic session.
- Clear fault codes using either the Faults page or the Activations page.
- Key Off Cycle
Turn the ignition key to the OFF position and wait at least 1 minute. - Re-scan and Clear Codes Again
- Turn the key back ON.
- Run a new diagnostic scan.
- Clear any remaining or stored (memorized) fault codes.
- Run Engine to Complete Control Cycles
- Start the engine and allow it to run for approximately 2 minutes.
- If the engine shuts down after about 1 minute, restart it and continue running.
- The ECM requires multiple complete control cycles to verify that the DEF level is correct.
- Verify Code Status and Final Clear
- Confirm that the SCR inducement code (3712 or 3714) changes from Active to Inactive/Memorized.
- Once it is no longer active, clear the code.
Result
After completing these steps, the derate condition should be removed and the engine should return to normal operation.
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