On-Vehicle Inspection

INSPECT THROTTLE BODY

Fig 1: Identifying Throttle Body
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1. Check for an operating sound.
  1. Turn the ignition switch to the ON position.
  2. When turning the accelerator pedal position sensor lever, listen to a running sound of the motor. Also, check that there is no friction sound.
    If operation is not as specified, check the throttle control motor (See INSPECTION ), wiring and ECM.
2. Inspect the throttle position sensor.
  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to the ON position.
  3. When turning the accelerator pedal position sensor lever to the full-open position, check the throttle valve opening percentage (THROTTLE POS) of the CURRENT DATA.
    Standard throttle valve opening percentage:
    
    60% or more
    
    If the result is not as specified, check the accelerator pedal position sensor (See ON-VEHICLE INSPECTION ), wiring and ECM.
    
    If the intelligent tester is not available, measure the voltage between the terminals (VTA1 - E2, VTA2 - E2) of the ECM connector (See TERMINALS OF ECM ).
3. Inspect the air assist system.
  1. Start the engine and check that the MIL does not light up.
  2. Warm up the engine to the normal operating temperature.
  3. Switch the A/C compressor from ON to OFF, and check the idle speed.
    Idle speed (Transmission in neutral):
    
    700 +- 50 rpm
    
    NOTE: Perform this inspection while no electrical load is applied.
4. Perform the driving test.