GSIC - Global Service Information Center

# INTAKE AIR CONTROL SYSTEM > ON-VEHICLE INSPECTION

## for Preparation Click here

1. CHECK INTAKE MANIFOLD

1. Connect a vacuum gauge between the control valve and VSV.

1. Warm up the engine.

1. Measure the vacuum.

   Standard condition:

     Engine Condition | VSV Condition | Specified Condition
     Normal engine speed | ON | Approx. 35 kPa (263 mmHg, 10.35 in.Hg)
     3,000 rpm or more | OFF | 0 kPa (0 mmHg, 0 in.Hg)

2. CHECK INTAKE AIR SYSTEM

1. Check for leakage or clogging between the air cleaner housing and turbocharger inlet, and between the turbocharger outlet and cylinder head.

   Condition | Operation
   Clogged air cleaner | Clean or replace
   Collapsed or deformed hoses | Repair or replace
   Leakage from connections | Check each connection and repair
   Cracks in components | Check and replace

3. CHECK EXHAUST SYSTEM

1. Check for leakage or clogging between the cylinder head and turbocharger inlet, and between the turbocharger outlet and exhaust pipe.

   Condition | Operation
   Deformed components | Repair or replace
   Foreign matter in passages | Remove
   Leakage from components | Repair or replace
   Cracks in components | Check or replace

4. CHECK TURBOCHARGER PRESSURE

1. Warm up the engine.

1. Using a 3-way connector, connect SST (turbocharger pressure gauge) to the hose between the manifold absolute pressure sensor and the gas filter leading to the intake air connector.

   SST
     09992-00242

1. 1. M/T:
      Depress the clutch pedal, and then fully depress the accelerator pedal. Measure the turbocharging pressure at maximum speed (approximately 4,600 rpm).
   2. A/T:
      Fully depress the accelerator pedal. Measure the turbocharging pressure at maximum speed (approximately 4,600 rpm).

   Standard pressure:
     15 to 45 kPa (0.15 to 0.46 kgf/cm2, 2.1 to 6.5 psi)
   1. If the pressure is less than the minimum, check the intake air and exhaust system for leakage.
   1. If there is no leakage, perform the "check motor for turbocharger control operation" procedures below. If the result is not as specified replace the turbocharger.

5. CHECK TURBINE SHAFT ROTATION

1. Grasp the edge of the turbine shaft and turn it. Check that the turbine shaft turns smoothly.
   If the turbine shaft does not turn or is difficult to turn, replace the turbocharger.

6. CHECK MANIFOLD ABSOLUTE PRESSURE SENSOR

1. Inspect the power source voltage.

   1. Disconnect the pressure sensor connector.

   2. Turn the ignition switch ON.

   3. Measure the voltage between terminals T9-3 (VC (+)) and T9-1 (E2 (-)) of the wire harness side connector.

      Standard voltage:
        4.5 to 5.5 V
      If the result is not as specified, inspect the wire harness or ECM (Click here).

   4. Turn the ignition switch OFF.

   5. Connect the pressure sensor connector.

1. Check the power supply.

   1. Turn the ignition switch ON.

   2. Disconnect the vacuum hose from the pressure sensor.

   3. Connect a voltmeter to terminals E7-28 (PIM (+)) and E8-28 (E2 (-)) of the ECM, and measure the output voltage at ambient atmospheric pressure.

   4. Apply a vacuum to the pressure sensor in 13.3 kPa (100 mmHg, 3.94 in.Hg) increments until the pressure reaches 40.0 kPa (300 mmHg, 11.81 in.Hg). Measure the decrease in voltage for each increment.

      Standard voltage:

        Applied Vacuum | Voltage Decrease
        -13.3 kPa (100 mmHg, 3.94 in.Hg) | 0.1 to 0.4 V
        -26.6 kPa (199 mmHg, 7.85 in.Hg) | 0.2 to 0.6 V
        -40 kPa (300 mmHg, 11.81 in.Hg) | 0.4 to 0.8 V

      If the result is not as specified, replace the manifold absolute pressure sensor.

   5. Using SST (turbocharger pressure gauge), apply pressure to the pressure sensor in 19.6 kPa (0.20 kgf/cm2, 2.84 psi) increments until the pressure reaches 98.0 kPa (1.00 kgf/cm2, 14.2 psi). Measure the increase in voltage for each increment.

      SST
        09992-00242

      Standard voltage:

        Applied Pressure | Voltage Increase
        19.6 kPa (0.20 kgf/cm2, 2.84 psi) | 0.1 to 0.4 V
        39.2 kPa (0.40 kgf/cm2, 5.69 psi) | 0.4 to 0.7 V
        58.8 kPa (0.60 kgf/cm2, 8.53 psi) | 0.7 to 1.0 V
        78.5 kPa (0.80 kgf/cm2, 11.4 psi) | 1.0 to 1.3 V
        98.0 kPa (1.00 kgf/cm2, 14.2 psi) | 1.3 to 1.6 V

      If the result is not as specified, replace the manifold absolute pressure sensor.

7. CHECK MOTOR FOR TURBOCHARGER CONTROL OPERATION

1. Remove the No. 1 exhaust manifold heat insulator (Click here) and No. 1 turbo insulator (Click here).

1. Check the stroke.

   NOTICE:
     Make sure the DC motor's connectors are properly installed.

   1. Turn the ignition switch ON and OFF.

   2. Check the DC motor's operation. Check that the motor rod stroke is as shown in A to D in the illustration below.

   3. After the DC motor operates, visually check that the vane activation link contacts the fully closed stopper.

      NOTICE:
        Never loosen or tighten the fully closed stopper's lock nut.
      If the result is not as specified, check the ECM and turbo motor driver (see pages Click hereand Click here).

8. CHECK TURBO MOTOR DRIVER

1. Check the voltage of the turbo motor driver.

   1. Turn the ignition switch ON.

   2. Measure the voltage of the motor driver.

      Standard voltage:

        Tester Connection | Specified Condition
        T8-8 (+B) - Body ground | 9 to 14 V

      If the voltage is not as specified, see page .

1. Check the resistance of the wire harness side connector.

   1. Turn the ignition switch OFF.

   2. Disconnect the T8 wire harness side connector.

   3. Measure the resistance of the motor driver.

      Standard resistance:

        Tester Connection | Specified Condition
        T8-6 (GND) - Body ground | Below 1 Ω

      If the resistance is not as specified, Click here.

1. Connect the T8 turbo motor drive connector.

1. Check the turbo motor signal.

   1. Connect a oscilloscope to the terminals of the ECM.

   2. While idling the engine, check the waveform of the ECM.

      Standard condition:

        ECM Terminal | (a) Between E8-10 (VNTO) and E7-7 (E1) (b) Between E8-17 (VNTI) and E7-7 (E1)
        Tester Range | 5 V/Division, 20 msec./Division
        Specified Condition | Idling with warm engine

      If the result is not as specified, replace the turbo motor driver.

      HINT:
        The waveform varies depending on the turbocharger operation.