CUSHION ASSEM. 6A3411 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
3361-7
Aftertreatment #1 DEF Dosing Unit : Not Responding Properly 3821-7
Aftertreatment #1 DEF Dosing Valve Actuator #1 : Not Responding Properly The DEF injector is not functioning properly. Note: 372-5260 Kit-Test and 441-0451 Kit-Test are required for completing this procedure.
Table 2
Troubleshooting Test Steps Values Results
1. Check the Diesel Exhaust Fluid (DEF) quality..
A. Measure the DEF quality. Refer to Testing and Adjusting, "Diesel Exhaust Fluid Quality - Test" for the procedure.
DEF Quality
Result : The DEF is not contaminated and the concentration is within the acceptable range.
Proceed to Test Step 2.
Result : The DEF is not contaminated and the concentration is not within the acceptable range.
Repair: Drain the DEF from the tank. Refill the tank with DEF that meets ISO 22241 quality standards.
Proceed to Test Step 6.
Result : The DEF is contaminated.
Repair : Contact the Dealer Solutions Network (DSN) for further information.
2. Perform the "DEF Dosing System Accuracy Test" using Cat® Electronic Technician (ET).
A. Refer to Testing and Adjusting, "Aftertreatment SCR System Dosing -Test" for the procedure.
DEF Dosing System Accuracy Test
Result : The quantity collected is below specification.
Proceed to Test Step 3.
Result : The quantity collected is within specifications.
Repair: Install the DEF injector. Refer to Disassembly and Assembly, DEF Injector and Mounting - Remove and Install.
Proceed to Test Step 6.
Result : The quantity collected is above specification. A failed DEF injector has been detected.
Repair : Replace the DEF injector. Refer to Disassembly and Assembly, DEF Injector and Mounting - Remove and Install.
Proceed to Test Step 5.
3. Check the DEF pressure line.
A. Turn the keyswitch to OFF. Allow 2 minutes to elapse before proceeding.
B. Visually inspect the lines for leaks or damage.
C. Remove the DEF pressure line between the DEF pump and the DEF injector.
D. Inspect the DEF pressure line for obstructions. Flush the line with water or low-pressure air, if necessary.
Note : Possible obstructions are ice, DEF deposits, or debris.
Restriction, Obstructions, and Leaks
Result : An obstruction was found.
Repair : Flush or replace the line.
Proceed to Test Step 5.
Result : An obstruction was not found.
Proceed to Test Step 4.
4. Replace the DEF injector.
A. Turn the keyswitch to OFF.
B. Replace the DEF injector. Refer to Disassembly and Assembly, DEF Injector and Mounting - Remove and Install.
Note : Do not install the new injector until Test Step 5 has been completed.
DEF Injector
Result: The DEF injector was connected to the DEF pressure line and the electrical connector.
Proceed to Test Step 5.
5. Perform the "DEF Dosing System Accuracy Test" using Cat ET
A. Perform a "DEF Dosing System Accuracy Test" using Cat ET. Refer to Testing and Adjusting, "Aftertreatment SCR System Dosing Test" for the procedure.
"DEF Dosing System Accuracy Test"
Result: The quantity collected is within specification. Install the DEF injector.
Proceed to Test Step 6.
Result: The quantity collected is not within specifications.
Repair : Replace the DEF pump. Refer to Disassembly and Assembly, Diesel Exhaust Fluid Pump - Remove and Install. Reinstall the DEF injector.
Proceed to Test Step 6.
6. Perform an "Aftertreatment System Functional Test"
A. Turn the keyswitch