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Home >> Saab >> 2003 >> 9-5 Arc, 4D Sedan >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Turbocharger System >> Fault diagnosis, symptoms >> Poor driveability, reduced performance, uneven idling speed >> Diagnostic procedure

Diagnostic procedure

  1. Remove the upper engine cover.
    Fig 1: Illustration For Steps 1
    G03656415Courtesy of SAAB-SCANIA OF AMERICA, INC.
  2. Detach the crankcase ventilation hose clamp at the rear section of the camshaft cover using 30 07 739 HOSE PINCH-OFF PLIERS  and block the hose with a suitable plug, "O SLASH" 25mm.
    Fig 2: Illustration For Steps 2, 3
    G03656416Courtesy of SAAB-SCANIA OF AMERICA, INC.
    IMPORTANT: Do not  plug the hole in the camshaft cover. The air that leaks past the pistons down in the crankshaft during test pressurizing must be evacuated through this hole.
  3. Undo the intake hose by the mass air flow sensor. Fit the plug from kit 83 95 659 in the hose and then connect the pressure regulator to an external compressed air outlet.
    IMPORTANT: Close the pressure regulator before connecting it to the air pressure outlet.
  4. Connect Tech 2, set the ignition key to the "ON" position and select "Read values" for the engine type in question. Scroll on through the list until "Charge pressure sensor" in "V" can be seen.
    IMPORTANT: When pressure increases, DTCs P0106 and P1106 will be generated due to the difference between boost pressure and atmospheric pressure. When the DTCs are generated "Boost pressure" will indicate 101 kPa, which is the default value. Boost pressure must therefore be read off directly from the voltage signal.
  5. Read off the voltage from the charge pressure sensor using Tech 2 and pressurize the intake system by carefully turning the pressure regulator until a maximum of 2.5V is reached.

    1.6 V corresponds to approx. 100 kPa (atmospheric pressure)

    2.5 V corresponds to approx. 160 kPa (60 kPa overpressure)

    Fig 3: Voltage Vs Pressure Graph
    G03656417Courtesy of SAAB-SCANIA OF AMERICA, INC.
  6. The whole intake system is pressurized in this way and leaks can be located using leakage spray or soapy water which foams around the leak. Check all components, hoses and connections and rectify any leaks.
    Fig 4: Checking Components For Leaks
    G03656418Courtesy of SAAB-SCANIA OF AMERICA, INC.
    1. 6.1. Resonator
    2. 6.2. Filter element
    3. 6.3. Mass air flow sensor
    4. 6.4. Turbocharger
    5. 6.5. Wastegate
    6. 6.6. Three way catalytic converter
    7. 6.7. Middle silencer
    8. 6.8. Rear silencer
    9. 6.9. Charge air cooler
    10. 6.10. Oil trap for crankcase ventilation (integrated in engine)
    11. 6.11. Vacuum pump
    12. 6.12. Swirl throttle regulator
    13. 6.13. Solenoid valve, swirl throttle
    14. 6.14. EGR valve
    15. 6.15. Charge air control valve
    16. 6.16. Pressure sensor
    17. 6.17. Brake servo
    18. 6.18. Check valve
    19. 6.19. Check valve
    20. 6.20. Motor
      IMPORTANT: Only large leaks affect the function of the engine management system. When leakage spray or soap water is used, even small leaks will be detected. Several small leaks can be grouped together and viewed as one large leak.

      Individual tiny leaks need not be remedied.

  7. Remove the plug from the intake hose. Connect the hose to the mass air flow sensor.
    Fig 5: Illustration For Steps 7, 8
    G03656419Courtesy of SAAB-SCANIA OF AMERICA, INC.
  8. Remove the plug from the crankcase ventilation hose. Connect the hose to the camshaft cover.
  9. Fit the upper engine cover.
    Fig 6: Illustration For Steps 9
    G03656420Courtesy of SAAB-SCANIA OF AMERICA, INC.
  10. Read the control module software version using Tech 2. If there is a later software version from the manufacturer then this must be programmed into the control module.
  11. If the problems are not resolved then complete the following checklist and contact the importer's technical support. Have the checklist ready.
  12. Disconnect Tech 2
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