KIT-SEAL 4610642 - Caterpillar

Table 1
Diagnostic Trouble Codes    
J1939 Code    CDL Code    Code Description    Comments    
4334-7     3090-7     Aftertreatment 1 Diesel Exhaust Fluid Doser Absolute Pressure: Not Responding Properly     The DCU detects signal voltage that is not in the acceptable range.
The code is logged.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    
Table 2
Required Service Tools    
Part Number     Description    
441-0451     Kit - Test    
Illustration 1 g03388352
(1) Suction line connection at DEF Header (2) Suction line connection at DEF pump (3) DEF Injector Pressure Line Connection
Table 3
Troubleshooting Test Steps    Values    Results    
1. Inspect All the DEF Lines for Leaks
A. Turn the keyswitch to the ON position. Do not start the engine.
B. Connect to the "Diesel Exhaust Fluid Controller #1 ECM" in Cat ET.
C. Perform the "DEF Dosing System Verification Test " in order to pressurize the system.
D. Visually inspect all DEF lines from the tank to the DEF injector. Look for pinched, damaged, or disconnected lines.
E. Inspect the lines for leakage.
F. Turn the keyswitch to the OFF position.
   
Leaks    
Result: The lines are leaking, damaged, pinched, or disconnected.
Make the necessary repairs.
Proceed to Test Step 5.
Result: The lines are not leaking, damaged, pinched, or disconnected.
Proceed to Test Step 2.
   
2. Check the DEF Lines for Obstructions
A. Remove the suction line from the DEF tank header and DEF pump.
B. Remove the pressure line from the DEF injector and the DEF pump.
C. Inspect both lines for obstructions. Flush lines with water/low pressure air if necessary.
Possible obstructions are ice, DEF deposits, or debris.
    Obstructions    
Result: An obstruction was found.
Flush the line or replace the line.
Proceed to Test Step 4.
Result: An obstruction was not found.
Proceed to Test Step 3.
   
3. Check the DEF Injector for Leakage
A. Remove the DEF injector from the CEM (Clean Emissions Module). Refer to the Disassembly and Assembly manual for the correct procedure. Place the injector into the container from the 441-0451 Kit - Test .
B. Turn the keyswitch to the ON position. Do not start the engine.
C. Connect to the "Diesel Exhaust Fluid Controller #1 ECM" in Cat ET.
D. Perform the "DEF Dosing System Verification Test ".
E. Check for DEF to flow from the injector
F. Turn the keyswitch to the OFF position.
   
Leakage    
Result: DEF did not leak from the injector. Reinstall DEF injector and replace the DEF pump.
Refer to the Disassembly and Assembly manual for the correct procedure.
Proceed to Test Step 5.
Result: DEF leaked from the injector.
Replace the DEF Injector.
Proceed to Test Step 5.
   
4. Perform an Aftertreatment System Functional Test
A. Turn the keyswitch to the ON position.
B. Connect to the "Engine #1 Aftertreatment Controller" in Cat ET.
C. Perform the "Aftertreatment System Functional Test".
    Test Passed    
Result: The test was successful.
Return the unit to service.
Result: The test was not successful and additional codes were logged.
Troubleshoot the additional codes, Refer to Troubleshooting for the correct procedure.
   Complete the procedure in the order in which the