Probable Causes
• Intake air filter
• Air intake system
• Wastegate regulator
• Turbocharger
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
Table 49
Troubleshooting Test Steps Values Results
1. Intake Air Filter
A. Check the air filter restriction indicator, if equipped.
B. Ensure that the air filter is clean and serviceable.
Air filter Result: The air filter is blocked.
Replace the air filter element. Refer to the Operation and Main-
tenance Manual, “Engine Air Cleaner Element - Replace”.
Result: The air filter is OK.
Proceed to Test Step 2.
2. Air Intake System
A. Check the air intake system for the following defects:
· Blockages
· Restrictions
· Damage to the air intake ducts and hoses
· Loose connections and air leaks
Air intake Result: The air intake system is blocked, restricted, damaged,
or loose.
Make all necessary repairs to the air intake system.
Result: The air intake system is OK.
Proceed to Test Step 3.
3. Wastegate Regulator
A. Use the electronic service tool to check for diagnostic trou-
ble codes that relate to the wastegate regulator.
Wastegate
regulator
Result: Diagnostic codes are present that relate to the waste-
gate regulator.
Rectify the cause of any related codes. Refer to Troubleshoot-
ing, “Diagnostic Trouble Codes”.
Result: There are no diagnostic codes that relate to the waste-
gate regulator.
Proceed to Test Step 4.
4. Turbocharger
Note: The turbocharger that is installed on the engine is a
nonserviceable item. If any mechanical fault exists, then the
turbocharger must be replaced.
A. Check that the compressor housings for the turbochargers
are free of dirt and debris.
B. Check that the turbine housings for the turbochargers are
free of dirt and debris.
C. Check that the turbine blades rotate freely in the
turbochargers.
Turbocharger Result: There is a fault with the turbocharger.
Replace the turbocharger. Refer to Disassembly and Assem-
bly, “Turbocharger - Remove” and Disassembly and Assembly,
“Turbocharger - Install”.
Result: The turbocharger is OK.
Contact the Dealer Solution Network (DSN).
102 UENR0612
Symptom Troubleshooting
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