CUP-BEARING 1M7911 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the following codes:
Table 1
Diagnostic Trouble Codes That Relate to Low ARD Temperature    
J1939 Code    Description    Comments    
3711-31     Diesel Particulate Filter Active Regeneration Inhibited Due to Low Exhaust Gas Temperature (2)     Either of these conditions can cause this code:
The ARD has been operating for 60 minutes. The temperature at the inlet to the Diesel Particulate Filter (DPF) is less than
540 °C (1000 °F). This condition has occurred twice.
The ARD has been operating for 10 minutes. The temperature at the inlet to the DPF is more than
40 °C (100 °F) less than the temperature that is desired. This condition has occurred twice.
The ARD is disabled if the first condition has caused the code. Transient regenerations are disabled if the second condition has caused the code.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    Illustration 1 and 2 shows an overview of the troubleshooting procedure. Follow the steps in order.
Illustration 1 g02755956
Illustration 2 g02756058
Test Step 1. Determine the Type of Cleaning System for the Nozzles Inside the ARD Combustion Head
Illustration 3 g01976876
Typical ARD combustion head (1) Electrical connector for the heated nozzle (ARD combustion head with a heated nozzle) (2) Air line for the pressurized air (ARD combustion head that uses pressurized air for cleaning the nozzles)
Determine the type of cleaning system for the nozzles inside the ARD combustion head. Results:
The ARD purge air system is used to clean the nozzles. - Repair: Contact your local Caterpillar Technical Communicator for information on updating to the heated nozzle system.STOP
An electric heating element is used to clean the nozzles. - Proceed to Test Step 2.Test Step 2. Check for Associated Diagnostic Trouble Codes
Establish communication between the Caterpillar Electronic Technician (ET) and the engine ECM.
Table 2 lists the diagnostic trouble codes that are associated with a 3711-31 code. Determine if any of the codes in Table 2 are present.
Table 2
Associated Diagnostic Trouble Codes    
Suspect Parameter Number (SPN)    Failure Mode Identifier (FMI)    Description    
Combustion Air System    
3832     15     Aftertreatment #1 Secondary Air Mass Flow : High - Least Severe (1)    
3832     17     Aftertreatment #1 Secondary Air Mass Flow : Low - Least Severe (1)    
3487