Table 57
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Connect the electronic service tool to the diagnostic
connector.
B. Use the electronic service tool to check for an active 5055
diagnostic code.
Diagnostic
codes
Result: A 5055 diagnostic code is active.
Proceed to Test Step 2.
Result: A 5055 diagnostic code is not active.
Proceed to Test Step 3.
2. Maintenance Interval Schedule
A. Use the electronic service tool to check the number of
hours since the last “Engine Oil Life Reset” was performed.
B. Compare the number of hours since the last “Engine Oil
Life Reset” to the maintenance interval for an oil change. Re-
fer to Operation and Maintenance Manual, “Maintenance In-
terval Schedule”.
Greater than oil
change interval
Result: The number of hours since the last “Engine Oil Life
Reset” is greater than the maintenance interval for an oil
change.
Change the engine oil and perform the “Engine Oil Life Reset”
. Refer to Operation and Maintenance Manual, “Engine Oil and
Filter - Change”.
Result: The number of hours since the last “Engine Oil Life
Reset” is less than the maintenance interval for an oil change.
Proceed to Test Step 3.
3. Excessive Use of Active Regeneration
Note: This step is only applicable to engines equipped with a
wall flow DPF.
A. Excessive use of active regeneration may cause excessive
fuel in the engine oil. Refer to Troubleshooting, “Diesel Partic-
ulate Filter Active Regeneration Occurrence Is Excessive”.
Excessive
regeneration
Result: There is excessive use of active regeneration.
Make any necessary repairs. Refer to Troubleshooting, “Diesel
Particulate Filter Active Regeneration Occurrence Is
Excessive”.
Change the engine oil and perform the “Engine Oil Life Reset”
. Refer to Operation and Maintenance Manual, “Engine Oil and
Filter - Change”.
Result: There is no excessive use of active regeneration.
Proceed to Test Step 4.
4. Fuel Injector Seals
A. Check for signs of damage to the seals for the fuel
injectors.
Fuel injector
seals
Result: Injector seals are damaged.
Replace any damaged injector seals.
Change the engine oil and perform the “Engine Oil Life Reset”
. Refer to Operation and Maintenance Manual, “Engine Oil and
Filter - Change”.
Result: All injector seals are OK.
Proceed to Test Step 5.
5. Fuel Injector Tip
A. Check for signs of damage to the fuel injectors. Check the
fuel injector tip for cracks or breakage.
Fuel injector tip Result: A fuel injector is damaged.
Replace the fuel injector. Refer to Disassembly and Assembly,
“Electronic Unit Injector - Remove” and Disassembly and As-
sembly, “Electronic Unit Injector - Install”.
Change the engine oil and perform the “Engine Oil Life Reset”
. Refer to Operation and Maintenance Manual, “Engine Oil and
Filter - Change”.
Result: All fuel injectors are OK.
Contact the Dealer Solution Network (DSN).
UENR0612 113
Symptom Troubleshooting
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