GUARD-DIRT 4F6066 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the following code:
Table 1
Diagnostic Trouble Codes for the Ignition System for the Aftertreatment Regeneration Device (ARD)    
J1939 Code    Description    Comments    
3473-31     Aftertreatment #1 Failed to Ignite     The ARD has attempted to ignite several times. All of the attempts were unsuccessful. Approximately 10 minutes are required for each attempt.
A "failed to ignite" code may not indicate that there is a problem with the ignition system. There may be a problem with another system such as combustion air or fuel.
Usually, the "failed to ignite" code is accompanied by another logged code that indicates the condition that caused the failure to ignite. The first Test Step in this procedure contains a Table that lists the additional codes.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    Illustration 1 and Illustration 2 show an overview of the troubleshooting procedure. Follow the steps in order.
Illustration 1 g02721510
Illustration 2 g02721515
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 the 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 3473-31 code. Determine if any of the codes in Table 2 are present.