BARREL AS 1184054 - Caterpillar

Table 1
Diagnostic Trouble Codes for DEF Tank Temperature Is Low
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
3031-7 E1441 (2) Aftertreatment #1 DEF Tank Temperature : Not Responding Properly The DCU detects that the DEF tank temperature is not responding properly. The code is logged.
3031-18 E1398 (2) Aftertreatment #1 DEF Tank Temperature : Low - moderate severity (2) The DCU detects that the Diesel Exhaust Fluid (DEF) tank temperature is lower than expected.
3363-7 3126-7 Aftertreatment #1 DEF Tank Heater : Not Responding Properly The DCU detects that the DEF tank temperature is not responding properly during a heating cycle. The code is logged.
5798-7 E1427 (1) Aftertreatment #1 DEF Dosing Unit Heater Temperature : Not Responding Properly The DCU detects that the DEF pump temperature sensor is not responding properly. The code is logged.
Follow the troubleshooting procedure to identify the root cause of the problem. The E1441 (2) or 3031-7 code will be logged when the engine is running, the Diesel Exhaust Fluid (DEF) tank temperature is colder than −8° C (17.6° F) and the DEF tank temperature started to rise, but has fallen back below −8° C (17.6° F).The E1427 (1) or 5798-7 code will be logged when the engine is running, the DEF tank temperature is warmer than −8° C (17.6° F), the DEF tank temperature has increased, but the DEF pump temperature has not changed.
Table 2
Associated Diagnostic Trouble Codes
J1939 Code CDL Code
3363-5 3126-5
3363-6 3126-6
4354-5 3110-5
4354-6 3110-6
4355-5 3111-5
4355-6 3111-6
4356-5 3112-5
4356-6 3112-6
5491-5 3822-5
5491-6 3822-6 Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Diagnostic Trouble Codes
A. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
B. Determine if an associated diagnostic code is present.
Diagnostic trouble codes
Result: An associated diagnostic trouble code is not present.
Proceed to Test Step 2.
Result: An associated diagnostic trouble code is present.
Repair: Troubleshoot the associated code.
2. Check the Coolant Level of the Engine
A. Determine if the engine coolant level is full.
Coolant level
Result: The coolant level is full.
Proceed to Test Step 3.
Result:The coolant level is not full.
Repair: Add coolant to the system.
Determine the cause of low coolant. Refer to Troubleshooting, "Coolant Level Is Low" for additional information.
Proceed to Test Step 3.
3. Check for Coolant Leaks
A. Check the entire engine cooling system for signs of coolant leaks.
B. Inspect the coolant supply and return lines to the Pump Electronic Tank Unit (PETU) for leaks or damage that may cause restrictions.
Leaks
Result: No leaks were detected.
Proceed to Test Step 4.
Result: There were leaks or damaged lines detected.
Repair: Repair the leaks or damaged lines and refill the coolant system.
Proceed to Test Step 4.
Illustration 1 g03767578
Typical Pump, Electronics, and Tank Unit (PETU)
(1) DEF tank header electrical connector
(2) DEF tank header
Table 4
Troubleshooting Test Steps Values Results
4. Check the Electrical Connection at the DEF Tank Header
A. Inspect electrical connector (1) to DEF tank header (2). Refer to Troubleshooting, "Electrical Connectors - Inspect" for further information.
Look for corrosion or loose wires.
Electrical connections
Result: The electrical connections are free