(Table 52, contd)
Troubleshooting Test Steps
Values Results
4. Check the Coolant Supply and Return Lines for Correct
Installation
A. Inspect the coolant supply and return lines from the engine to
the DEF tank, including the coolant diverter valve. Make sure that
the coolant is flowing in the correct direction through all
components.
Correct
installation
Result: The lines are installed correctly.
Proceed to Test Step 5.
Result: The lines are not installed correctly.
Repair: Correctly install the lines. Proceed to Test Step
6.
5. Check the Coolant Diverter Valve Solenoid for Proper
Operation
A. Turn the keyswitch to the OFF position.
B. Disconnect the 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 to operating
temperature.
F. Use the electronic service tool to monitor the “DEF Tank Tem-
perature” . Ensure that the DEF tank temperature is responding
correctly.
G. Turn the keyswitch to the OFF position.
Temperature rise Result: The DEF tank temperature did not increase.
Connect the coolant diverter valve to the wiring harness.
Contact the Dealer Solutions Network (DSN).
Result: The DEF tank temperature increased.
Repair: The coolant diverter valve is not operating cor-
rectly. Replace the coolant diverter valve. Refer to Disas-
sembly and Assembly, “Solenoid Valve (DEF Heater
Coolant) - Remove and Install”.
Proceed to Test Step 6.
6. Replace the DEF
A. Replace the DEF. Refer to Operation and Maintenance Manual,
“Diesel Exhaust Fluid Tank - Flush” for the correct procedure.
DEF Result: The DEF has been replaced.
Return the unit to service.
UENR4469-36 117
Symptom Troubleshooting
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