TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read PCM DTCs and record the related Freeze Frame data.
Is the Good Trip displayed and equal to zero?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
2 Turn the ignition on.
With the DRBIIIt, read the PCM DTCs.
NOTE: If there are any other MAP Sensor or Throttle Inlet Pressure Sensor
DTCs present, repair the other MAP Sensor or Throttle Inlet Pressure
Sensors before continuing.
Does the DRB display any other DTCs?
All
Yes → Refer to symptom list for problems related to MAP Sensor or
Throttle Inlet Pressure Sensor.
No → Go To 3
3 NOTE: The exhaust system must be free from any restriction to perform this
test.
Check all of the tubes and hoses between the air cleaner and the intake manifold for
loose connection, damage or restriction.
Check all of the tubes connected to the intercooler for loose connection, damage or
restriction.
Check all of the tubes and hoses connected to the turbocharger, TIP Solenoid, Surge
Solenoid and Wastegate Solenoid for loose connection, damage or restriction.
NOTE: Solenoid design and hose connections are identical for all three
solenoids. It is possible to connect the hoses to the incorrect solenoid. Verify
that hoses are connected to the correct solenoid.
Are any of these conditions evident?
All
Yes → Repair or replace as necessary.
No → Go To 4
4 Turn the ignition off.
Disconnect the hoses from the Surge Solenoid.
Connect a vacuum gauge to Surge Solenoid hose C.
Allow the engine to reach normal operating temperature.
Observe and note the vacuum gauge reading.
Is the vacuum at idle above 15 inches?
All
Yes → Go To 5
No → Repair or replace as necessary.
5 Turn the ignition off.
Using regulated air pressure slowly apply from 0 psi to 10 psi to the wastegate
actuator while observing the wastegate actuator arm.
NOTE: The wastegate actuator arm should extend approximately 1/2 to 3/4
inches as air pressure is applied.
Does the wastegate actuator arm extend 1/2 to 3/4 inch when 10 psi air pressure is
applied?
All
Yes → Go To 6
No → Replace the Turbocharger assembly in accordance with the Ser-
vice Information.
116
DRIVEABILITY - NGC
P0234-OVERBOOST PERFORMANCE — Continued
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