WASHER-SPECIAL 2G0339 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the following code:
Table 1
Diagnostic Trouble Codes for ARD Failed to Ignite    
J1939 Code     Code Description     Comments    
3473-31     Aftertreatment #1 Failed to Ignite     The ARD has failed to ignite for a regeneration cycle or the ARD failed to ignite during an ARD Ignition Test. Usually, this code is accompanied by another logged code that indicates the condition that caused the failure to ignite.    System OperationThe combustion air system routes pressurized air from the outlet of the high-pressure turbocharger to the ARD. The combustion air is mixed with fuel inside the ARD combustion head. The air/fuel mixture is ignited and the air/fuel mixture is burned in order to increase the temperature of the exhaust gas. The high temperature exhaust gas burns off the soot in the Diesel Particulate Filter (DPF). This process is known as DPF regeneration.The ECM sends a pulse width modulated signal to the combustion air valve. The actuator in the combustion air valve regulates the combustion air to the ARD combustion head.The ECM also sends pulse width modulated signals to the pilot fuel control valve. The pilot fuel control valve regulates the amount of fuel that is injected into the ARD combustion head.The ECM controls the ARD ignition system. Whenever the ARD is required to operate, the ECM operates the ARD ignition coil which then generates high voltage pulses in the ignition cable. The high voltage pulses create sparks at the spark plug in the ARD head. The spark ignites the fuel/air mixture in the ARD.If the amount of fuel or air that enters the ARD combustion head is incorrect or there are no ignition sparks, combustion may not occur.Test Step 1. Check for Associated Diagnostic Trouble Codes
Establish communication between the electronic service tool and the engine ECM.
Download the following items before performing any troubleshooting or clearing any diagnostic codes:
Warranty Report
Aftertreatment Regeneration Trigger History
Product Status Report with Histograms
Use the electronic service tool to check for active diagnostic codes.
Table 2 lists the diagnostic trouble codes that are associated with the "3473-31 Aftertreatment #1 Failed to Ignite" code. Determine if any of the codes in Table 2 are present.
Table 2
Associated Diagnostic Codes    
J1939 Code     Description     Associated Diagnostic Procedure    
3487-7     Aftertreatment #1 Air Pressure Control : Not Responding Properly     Motorized Valve - Test    
3480-16     Aftertreatment #1 Fuel Pressure #1 : High - Moderate Severity (2)     ARD Pilot Fuel Pressure Is High    
3480-17     Aftertreatment #1 Fuel Pressure #1 : Low - Least Severe (1)     ARD Pilot Fuel Pressure Is Low    
3480-18     Aftertreatment #1 Fuel Pressure #1 : Low - Moderate Severity (2)     ARD Pilot Fuel Pressure Is Low    
102-18     Engine Intake Manifold #1 Pressure Low (2)     Intake Manifold Air Pressure Is Low    
3556-7     Aftertreatment Fuel Injector #1 : Not Responding Properly     ARD Nozzle - Test    
3484-5     Aftertreatment #1 Ignition : Current Below Normal