(Table 106, contd)
Troubleshooting Test Steps
Values Results
3. Turbocharger Wastegate
Note: On engines with a single turbocharger, the wastegate
is attached to the turbocharger. On engines with twin turbo-
chargers, the wastegate is attached to the high-pressure
turbocharger.
A. Check the pipe assembly from the air inlet elbow to the tur-
bocharger wastegate for cracks or damage. Ensure that the
hose clamps are secure and not damaged.
B. Check the operation of the wastegate on the turbocharger.
Turbocharger
wastegate
Result: The pipe assembly or hose from the air inlet elbow to
the turbocharger wastegate is cracked or damaged. The hose
clamps are not secure.
Repair: Replace any damaged components.
Result: Operation of the turbocharger wastegate is suspect.
Repair: There is a suspected fault in the wastegate or the
wastegate actuator.
Check the wastegate for proper operation. Refer to Systems
Operation, Testing and Adjusting, Turbocharger - Inspect.
If the wastegate is not operating correctly, use the actuator
service kit. Refer to Special Instruction, M0134115, “Turbo-
charger Wastegate Actuator” or refer to Special Instruction,
M0119427, “Turbocharger Wastegate Actuator”.
Result: Operation of the wastegate lever is suspect.
Repair: Disconnect the output rod in the wastegate actuator
from the lever that operates the wastegate.
Operate the wastegate lever by hand and check for full and
free movement.
Check that the output rod in the wastegate actuator is biased
toward the retracted position.
Connect the output rod in the wastegate actuator to the lever
that operates the wastegate.
If the wastegate is not operating correctly, replace the turbo-
charger. Refer to Disassembly and Assembly, “Turbocharger -
Remove” and Disassembly and Assembly, “Turbocharger -
Install”.
Result: There is a suspected fault in the wastegate or the
wastegate actuator.
Repair: Replace the turbocharger. Refer to Disassembly and
Assembly, “Turbocharger - Remove” and Disassembly and
Assembly, “Turbocharger - Install”.
Result: The wastegate and the wastegate actuator operate
correctly.
Proceed to Test Step 4.
4. 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.
Repair: Rectify the cause of any related codes. Refer to Trou-
bleshooting, “Diagnostic Trouble Codes”.
(continued)
208 UENR4469-36
Symptom Troubleshooting
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