Throttle Body: Inspection

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY
1. Check the appearance.
  1. Check that the throttle valve shaft does not rattle.
  2. Check that each port is not clogged.
  3. Check that the throttle valve opens and closes smoothly.
  4. Check that there is no clearance between the throttle stop screw and lever when the throttle valve is fully closed.
    NOTE: Do not adjust the throttle stop screw.
    
    Fig 1: Inspecting Throttle With Motor Body Assembly
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the resistance of the throttle control motor.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Standard resistance:
    
    50 MΩ or more at 25°C (77°F)
    
    If the resistance is not as specified, replace the throttle with motor body.
    
    Fig 2: Measuring Resistance Between Terminals Using Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the resistance of the throttle position sensor.
  1. Using an ohmmeter, measure the resistance between terminals 1 and 4.
    Standard resistance:
    
    1.2 to 3.5 kΩ at 25°C (77°F)
    
    If the resistance is not as specified, replace the throttle with motor body.
    
    Fig 3: Measuring Resistance Between Terminals 1 And 4
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002