Inspection and Verification

NOTE: This article provides mechanical diagnosis of the turbocharger assembly. If there is a MIL illuminated, or a DTC is present, these should be diagnosed prior to performing turbocharger mechanical diagnosis.

1.

For PCM DTC, REFER to: Electronic Engine Controls . For driveability symptoms without DTC, Refer to Engine Controls - Symptom Charts (Except Diesel & Hybrid) .

2.

Verify the customer concern.

3.

Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical	Electrical
Oil leak(s) Coolant leak(s) Wastegate actuator(s) Wastegate actuator vacuum hose(s) Wastegate valve(s) Turbocharger housing(s) Air Cleaner (ACL) element Air Cleaner (ACL) outlet pipe Air Cleaner (ACL) intake pipe Turbocharger intake tube(s) CAC CAC intake pipe CAC outlet pipe Turbocharger oil supply tube(s) Turbocharger oil return tube(s) Turbocharger coolant supply tube(s) Turbocharger coolant return tube(s)	Wiring harness(es) Electrical connector(s) Turbocharger wastegate regulating valve solenoid PCM

Mechanical

Electrical

Oil leak(s)
Coolant leak(s)
Wastegate actuator(s)
Wastegate actuator vacuum hose(s)
Wastegate valve(s)
Turbocharger housing(s)
Air Cleaner (ACL) element
Air Cleaner (ACL) outlet pipe
Air Cleaner (ACL) intake pipe
Turbocharger intake tube(s)
CAC
CAC intake pipe
CAC outlet pipe
Turbocharger oil supply tube(s)
Turbocharger oil return tube(s)
Turbocharger coolant supply tube(s)
Turbocharger coolant return tube(s)

Wiring harness(es)
Electrical connector(s)
Turbocharger wastegate regulating valve solenoid
PCM

4.

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

5.

If the concern is not visually evident, verify the symptom .