CORE AS-RADIATOR 1139539 - Caterpillar

Refer to Systems Operation, "DEF Dosing Control System" for details on inducement configuration options and inducement actions for specific tank levels.Note: Always turn the key to OFF before adding DEF to the tank.
Table 1
Diagnostic Trouble Codes
J1939 Code and Description CDL Code and Description Comments
1761-1
Aftertreatment #1 Diesel Exhaust Fluid Tank Level : Low - most severe (3) E954 (3)
Aftertreatment #1 Diesel Exhaust Fluid Tank Level : Low - most severe (3) This code is a Level 3 inducement that becomes active when the DEF tank is empty. The engine is derated 100%, limited to low idle or 1000 RPM, and may experience 5 minute rolling shutdowns.
1761-17
Aftertreatment #1 Diesel Exhaust Fluid Tank Level : Low - least severe (1) E954 (1)
Aftertreatment #1 Diesel Exhaust Fluid Tank Level : Low - least severe (1) This code is a Level 1 inducement that becomes active when the DEF level is critically low.
1761-18
Aftertreatment #1 Diesel Exhaust Fluid Tank Level : Low - moderate severity (2) E954 (2)
Aftertreatment #1 Diesel Exhaust Fluid Tank Level : Low - moderate severity (2) This code is a Level 2 inducement that becomes active when the DEF level is critically low. Power loss may occur.
Table 2
Associated Diagnostic Codes
1235–9
5856–9
1235–14
5856–14
3516–12
3100–12 Reference: Refer to the Disassembly and Assembly for the appropriate procedure for removal and installation of components.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Codes
A. Connect to Cat® Electronic Technician (ET).
B. Determine if there are associated codes present.
Codes
Result: An associated code is not present.
Proceed to Test Step 2.
Result: An associated code is present.
Repair: Troubleshoot the code.
If the problem is not resolved, proceed to Test Step 2.
2. Check the DEF Fluid Level
A. Turn the keyswitch to ON. Do not start the engine.
B. Check the current position of the DEF gauge.
C. Turn the keyswitch to OFF.
D. Clean dirt and debris from around the cap before removing the cap.
E. Add DEF to the DEF tank.
Only use DEF that meets ISO 22241 quality standards.
F. Turn the keyswitch to ON.
G. Check for a change in the gauge position.
Gauge Position
Result: The gauge did not move by adding DEF to the tank.
Proceed to Test Step 3.
Result: The gauge moved by adding DEF to the tank. Turn the keyswitch to OFF for 2 minutes to allow the DEF pump to purge, reset the code, and reset the Diesel Exhaust Fluid Controller (DCU).
Return the unit to service.
3. Check the Electrical Connection at the DEF Tank Header
A. Inspect the electrical connections to the