SPACER 1T0744 - Caterpillar

Table 1
Diagnostic Trouble Codes for Desulfation Is Frequent
J1939 Code Description Notes
6322-31 Aftertreatment #1 SCR Desulfation too Frequent The engine has attempted to burn off sulphur deposits in the aftertreatment system three times without success.
6935-15 Aftertreatment #1 SCR System Total Cleaning Time : High Least Severe (1) The engine has attempted to burn off sulphur deposits in the aftertreatment system three times without success.
The warning lamp will come on.
Follow the troubleshooting procedure to identify the root cause of the problem. Complete the procedure in the order in which the steps are listed.Aftertreatment Sulfation Recovery ProcedureNote: Electronic service tool version 2017B or later is required to perform this procedure.Note: Use the electronic service tool to disable "Engine Idle Shutdown" and/or "User Defined Shutdown", if enabled, before performing this procedure. This action prevents the engine from shutting down immediately after the procedure has completed and allows a sufficient cool-down period.The "Aftertreatment Sulfation Recovery Procedure" is designed to clear sulfate deposits that have built up in the Selective Catalytic Reduction (SCR) aftertreatment. Part 2 of the procedure is used to clear the diagnostic code and remove the warning lamp. Part 1 of the procedure must be performed before part 2.When safety interlocks are in place, the procedure works by taking control of the engine. A sequence of tests is performed to elevate exhaust temperatures and ensure that optimal conditions are met to reduce sulfate levels. Once sulfate levels are reduced to the required level, the procedure will complete.Note: After the procedure has completed, allow a sufficient cool-down period at low idle before stopping the engine. Refer to Operation and Maintenance Manual, Stopping the Engine for more information.
Table 2
Possible Error Messages Generated During the Aftertreatment Sulfation Recovery Procedure
Description Notes Temperature Related
Coolant Temperature must be between 75° C (167° F) and 100° C (212° F)