Table 116
Troubleshooting Test Steps
Values Results
4. Inspect All the DEF Lines and the DEF Injector
A. Ensure that all DEF lines are correctly connected to the DEF
tank header, the DEF pump, and the DEF Injector. Refer to Illus-
tration 73 for the correct connections.
B. Turn the keyswitch to the ON position. Do not start the engine.
C. Use the electronic service tool to perform the “DEF Dosing Veri-
fication Test” to pressurize the system. Refer to Troubleshooting,
“Service Tool Features” for more information.
D. Visually inspect all DEF lines from the DEF tank to the DEF in-
jector. Look for pinched, damaged, or disconnected lines.
E. Inspect the lines for leakage.
F. Inspect the DEF injector for external leaks and leakage through
the electrical connector.
G. Turn the keyswitch to the OFF position.
Leaks Result: The lines are not connected correctly.
Repair: Install new DEF lines in the correct positions.
Proceed to Test Step 7.
Result: The lines are leaking, damaged, pinched, or
disconnected.
Repair: Make the necessary repairs.
Proceed to Test Step 7.
Result: The DEF injector is leaking externally.
Install a replacement DEF injector. Refer to Disassembly
and Assembly, DEF Injector and Mounting - Remove and
Install.
Proceed to Test Step 7.
Result: The lines are not leaking, damaged, pinched, or
disconnected. The DEF injector is not leaking. All DEF
lines are correctly connected.
Proceed to Test Step 5.
5. Check for Exhaust Leaks
A. Start the engine.
B. Check the exhaust system for leaks or damage.
C. Check all exhaust connections from the turbo outlet to the SCR
outlet (tailpipe outlet).
D. Check for damage to the exhaust system insulation.
Leaks Result: Exhaust leaks are found.
Repair: Repair or replace the component that is causing
an exhaust leak.
Proceed to Test Step 7.
Result: There were no exhaust leaks found.
Proceed to Test Step 6.
UENR4469-36 219
Symptom Troubleshooting
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