i06080138
Exhaust System Contains
Coolant
Use the following procedure to troubleshoot a
problem with coolant in the exhaust system.
Probable Causes
• NOx Reduction System (NRS) cooler
• Cylinder head gasket
• Cylinder head
• Cylinder block
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
Note: After the repair has been made, the electronic
service tool must be used to perform an
“Aftertreatment System Functional Test” . The test
will verify the correct functionality of both NOx
sensors and the catalysts.
Table 89
Troubleshooting Test Steps
Values Results
1. NRS cooler
A. Check the NRS cooler for leaks by utilizing the “On Engine
Test Procedure” . Refer to Systems Operation, Testing, and
Adjusting, “Exhaust Cooler (NRS) - Test”.
NRS cooler Result : The NRS cooler has a leak.
Repair: Replace the NRS cooler. Refer to the Disassembly
and Assembly manual for the correct procedure.
Proceed to Step 5.
Result : The NRS cooler does not have a leak.
Proceed to Test Step 2.
2. Cylinder Head Gasket
A. Remove the cylinder head. Refer to Disassembly and As-
sembly, “Cylinder Head - Remove”.
B. Inspect the cylinder head gasket for faults and any signs of
leakage.
Cylinder head
gasket
Result: The cylinder head gasket does not show signs of
damage or leakage.
Repair: Install a new cylinder head gasket and install the cyl-
inder head. Refer to Disassembly and Assembly, “Cylinder
Head - Install” .
Result: The cylinder head gasket shows signs of damage or
leakage.
Proceed to Test Step 3.
(continued)
180 UENR4469-36
Symptom Troubleshooting
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