Intake Charge Pressure Check

ON-VEHICLE SERVICE

INTAKE CHARGE PRESSURE CHECK

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A







1. Removing the black hose from the No. 1 turbocharger wastegate solenoid or the brown connector, install the pressure gauge to this hose. Cap the nipple of solenoid after removing the black hose.







2. Disconnect the black connector of No. 2 turbocharger wastegate solenoid.

CAUTION: Two persons should be in the vehicle when the test is conducted; the person in the passenger seat should read the indications shown by the pressure meter.

3. When the engine speed reaches approximately 3,000 r/min or more with the throttle fully opened in the second gear, measure the intake charge pressure.

Standard value: 85 - 159 kPa (12.4 - 23.0 psi)

4. If the intake charge pressure is lower than the standard, check the following possible causes.
a. Turbocharger wastegate actuator malfunction
b. Turbocharger wastegate regulating valve malfunction
c. Intake charge pressure leakage
d. Turbocharger malfunction
e. Turbocharger bypass valve malfunction

5. If the intake charge pressure is higher than the standard, check on the following areas because the intake charge pressure control might be abnormal.
a. Turbocharger wastegate actuator malfunction
b. Turbocharger wastegate regulating valve malfunction
c. Rubber hose of turbocharger wastegate actuator disconnected or cracked







6. Connect the black connector of No. 2 turbocharger wastegate solenoid.







7. If the diagnostic trouble code is stored during the check, use scan tool MB991958 to eliminate the diagnosis code.