On-Vehicle Inspection

INSPECT INTAKE AIR CONTROL FUNCTION

Fig 1: Identifying Vacuum Switching Valve Assembly & Intake Air Control Valve Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Remove the V-bank cover.
2. Warm up the engine.
3. Turn the ignition switch OFF.
4. Connect the Techstream to the DLC3.
5. Start the engine and allow it to idle.
6. Turn the Techstream ON.
7. Select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VSV for Intake Control / ON.
  1. Check that the intake air control valve is pulled out.
    If the intake air control valve does not operate, replace the VSV for ACIS or intake air surge tank.
8. Select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VSV for Intake Control / OFF.
  1. Check that the intake air control valve is returned to its original position.
    If the intake air control valve does not operate, replace the VSV for ACIS or intake air surge tank.
9. Select the following menu items: Powertrain / Engine and ECT / Data List / Engine Speed, Throttle Position, ACIS VSV.
  1. When depressing the accelerator pedal to the 60% accelerator opening angle and running the engine at a speed of 2,200 to 4,100 rpm, check that the VSV for ACIS is ON.
    If the intake air control valve does not operate, replace the VSV for ACIS.
  2. Under the conditions described in step ( 1), or while the engine is idling, release the accelerator pedal and check that the VSV for ACIS is OFF.
    If the intake air control valve does not operate, replace the VSV for ACIS.
INSPECT INTAKE AIR CONTROL VALVE
1. Remove the V-bank cover (See REMOVAL ).
2. Using a 3-way connector, connect a vacuum gauge to the actuator hose.
3. Start the engine.
4. While the engine is idling, check that the vacuum gauge needle momentarily fluctuates up to approximately 39.9 kPa (300 mmHg, 11.8 in.Hg). (The actuator rod is pulled out.)
  If the intake air control valve does not operate, replace the intake air surge tank.
5. Rapidly depress the accelerator pedal to the fully open position and check that the vacuum gauge needle points to 0 kPa (0 mmHg, 0 in.Hg). (The actuator rod is returned to its original position.)
  If the intake air control valve does not operate, replace the intake air surge tank.
  
  Fig 2: Identifying Intake Air Control Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002