SOCKET AS-THD-YM 2826627 - Caterpillar

Use this procedure to troubleshoot a problem with the Diesel Exhaust Fluid (DEF) tank level. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description CDL Code and Description Comments
1761-1
Aftertreatment #1 DEF Tank Level : Low - most severe (3) E954 (3)
Low Aftertreatment #1 DEF Tank #1 Level The Electronic Control Module (ECM) detects that the remote Diesel Exhaust Fluid (DEF) tank level is lower than a threshold.
The code is logged.
1761-17
Aftertreatment #1 DEF Tank Level : Low - least severe (1) E954 (1)
Low Aftertreatment #1 DEF Tank #1 Level The ECM detects that the remote DEF tank level is lower than a threshold.
The code is logged.
1761-18
Aftertreatment #1 DEF Tank Level : Low - moderate severity (2) E954 (2)
Low Aftertreatment #1 DEF Tank #1 Level The ECM detects that the remote DEF tank level is lower than a threshold.
The code is logged.
4367-1
Aftertreatment #1 DEF Tank #2 Level : Low - most severe (3) E955 (3)
Low Aftertreatment #1 DEF Tank #2 Level The ECM detects that the DEF buffer tank level is below a threshold.
The code is logged.
4367-17
Aftertreatment #1 DEF Tank #2 Level : Low - least severe (1) E955 (1)
Low Aftertreatment #1 DEF Tank #2 Level The ECM detects that the DEF buffer tank level is below a threshold.
The code is logged.
4367-18
Aftertreatment #1 DEF Tank #2 Level : Low - moderate severity (2) E955 (2)
Low Aftertreatment #1 DEF Tank #2 Level The ECM detects that the DEF buffer tank level is below a threshold.
The code is logged.
4367-31
Aftertreatment #1 DEF Tank #2 Level E1589 (2)
Low Aftertreatment #1 DEF Tank #2 Level The ECM detects that the DEF buffer tank level is not refilling as fast as expected.
The code is logged.
If, the 4367-31 code is active the fill solenoid will be disabled until cleared.
Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
4367-3 3131-3 Troubleshooting, "DEF Tank Sensor - Test"
4367-4 3131-4 Troubleshooting, "DEF Tank Sensor - Test"
5434-3 N/A Troubleshooting, "Solenoid Valve - Test"
5434-4 N/A Troubleshooting, "Solenoid Valve - Test"
Illustration 1 g03738409
(1) Remote tank
(2) DEF tank refill valve
(3) Buffer tank
(4) DEF transfer pump (optional)
(5) DEF filter
Illustration 2 g06096192
(6) DEF filterProbable Causes
DEF level
Sensor
DEF lines
DEF filter
Transfer pump (if equipped)
Relay circuitRecommended Actions
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: An E955, E1589, 4367-1, 4367-17, 4367-18, or 4368-31 code is active.
Proceed to Test Step 4.
Result: An E951 (1) or 1761-17 code is active.
Proceed to Test Step 2.
2. Check the Remote Diesel Exhaust Fluid (DEF) Tank Level
A. Visually inspect the level of DEF in the Remote DEF tank.
DEF Level
Result: The remote DEF Tank level is not below the low DEF level switch.
Proceed to Test Step 3.
Result: The remote DEF tank level is below the low DEF level switch.
Repair: Add DEF to the remote DEF tank.
If the problem is not resolved, proceed to Test