STEM AS-COLLET 7S3122 - Caterpillar

Table 1
Diagnostic Trouble Code for DEF Tank Temperature Is High
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
3031-16 E960-2 Aftertreatment #1 DEF Tank Temperature : High - moderate severity (2) The code is logged when the DEF tank temperature exceeds 80° C (176° F).
Table 2
Associated Diagnostic Trouble Codes
J1939 Code CDL Code
110-0 E361 (3)
110-15 E361 (1)
110-16 E361 (2)
Follow the troubleshooting procedure in order to identify the root cause of the fault. Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Codes
A. Connect to the electronic service tool.
B. Determine if an associated code is present.
Associated code
Result: An associated code is present.
Repair: Troubleshoot the associated code. Refer to Troubleshooting, "Diagnostic Trouble Codes" for the correct procedure.
Result: An associated code is not present.
Proceed to Test Step 2.
2. Check the Electrical Connections
A. Inspect the electrical connections to the coolant diverter valve. Inspect all electrical connections to the Diesel Exhaust Fluid (DEF) tank header. Refer to Troubleshooting, "Electrical Connectors - Inspect" for further information.
B. Inspect for corrosion or loose wires.
Corrosion or loose wires
Result: The connections are free of corrosion and are not loose.
Proceed to Test Step 3.
Result: The connections are corroded and/or are loose.
Repair: Make the necessary repairs.
Proceed to Test Step 4.
Illustration 1 g03767336
Coolant line configuration may be different depending on the application.
(1) Coolant return fitting
(2) DEF tank header connector
(3) Coolant diverter valve
(4) Coolant supply fitting
Table 4
Troubleshooting Test Steps Values Results
3. Check the Coolant Supply and Return Lines for Proper Installation
A. Check the coolant supply line and the coolant return line from the engine to the Pump Electronic Tank Unit (PETU). Make sure that the coolant is flowing in the correct direction. Refer to Illustration 1.
Correct Installation
Result: The lines are installed correctly.
Proceed to Test Step 4.
Result: The lines are not installed correctly.
Repair: Correctly install the lines.
Proceed to Test Step 5.
4. Check the Coolant Diverter Valve Solenoid for Proper Operation
A. Turn the keyswitch to the OFF position.
B. Disconnect the coolant diverter valve wiring harness connector from the coolant diverter valve.
C. Turn the keyswitch to the ON position.
D. Connect to the electronic service tool.
E. Start the engine. Allow the engine to warm up to operating temperature.
F. Use the electronic service tool to monitor the "DEF Tank Temperature".
G. Turn the keyswitch to the OFF position.
Temperature rise
Result: The tank temperature did not increase.
Repair: Connect the coolant diverter valve to the wiring harness.
Proceed to Test Step 5.
Result: The tank temperature did increase.
Repair: A failed coolant diverter valve has been detected. Replace the coolant diverter valve. Refer to Disassembly and Assembly, "Solenoid Valve (DEF Heater Coolant) - Remove and Install" for the correct procedure.
Proceed to Test Step 5.
5. Replace the DEF
A. Drain the DEF from the tank.
B. Fill the tank with DEF that meets ISO 22241 standards.
DEF
Result: The tank fluid was replaced.
Return the unit to service.
Result: The fault is still present.
Contact the Dealer Solutions Network (DSN).