ELEMENT 1262131 - Caterpillar

Note: Before commencing this procedure, ensure that the rework instructions detailed in M0083779, "Aftertreatment Regeneration on Certain C1.5 and C2.2 Engines" has been carried out on the engine.Use this procedure to troubleshoot the following code:
Table 1
Diagnostic Trouble Codes for ARD Failed to Ignite
J1939 Code Code Description Comments
3473-7 Aftertreatment #1 Failed to Ignite : Not Responding Properly The ARD temperature has failed to increase as expected.
The keyswitch has been ON for 2 seconds.
Diagnostic codes 168-xx, 3484-xx, 3556-6, and 5487-xx are not active.
Active regeneration is disabled.
3473-11 Aftertreatment #1 Failed to Ignite : Other Failure Mode The keyswitch has been ON for 2 seconds.
Diagnostic codes 168-xx, 3484-xx, 3556-6, and 5487-xx are not active.
Active regeneration is disabled.
3473-12 Aftertreatment #1 Failed to Ignite : Failure 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.
Illustration 1 g03773198
(1) Air compressor
(2) Compressor intake hose
(3) Compressor outlet hose
(4) Reed valve
(5) ARD air intake tube
(6) ARD
(7) ARD glow plugSystem OperationThe combustion air system routes pressurized air from the outlet of air compressor (1) to the ARD. Reed valve (4) between hose assembly (3) and tube assembly (5) prevents exhaust gas flowing towards the air compressor. The combustion air is mixed with fuel inside ARD combustion chamber (6). The air/fuel mixture is ignited by glow plug (7) 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 controls the operation of an electronic clutch in the air compressor. The ECM also controls the fuel injectors in the ARD.The ECM controls the ARD glow plug. Whenever the ARD is required to operate, the ECM provides power to the glow plug through a voltage dropper.If the amount of fuel or air that enters the ARD is incorrect or the glow plug does not operate correctly, combustion may not occur.Associated Diagnostic Trouble Codes
Use the following procedure to check for associated diagnostic codes:
Establish communication between the electronic service tool and the engine ECM.
Table 2 lists the diagnostic trouble codes that can be associated with the "3473-7 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 Actions Required
1485–14 ECM Main Relay : Special Instruction This code is most likely caused by shutting down the engine using the battery disconnect switch instead of the keyswitch for three consecutive shutdowns or using the battery disconnect switch immediately after the keyswitch has been turned OFF.
An "ARD Failed to Ignite" condition after this code has been active may indicate damage to the ARD fuel injectors. Perform Test Step 11 and Test Step 12 of "ARD Fuel Supply" in this procedure to test the ARD fuel injectors.
If the ARD fuel injectors are not injecting fuel, replace the ARD fuel injectors. Refer to Disassembly and Assembly,