Throttle Body: Inspection

NOTE: In case of changing, removing or installing the throttle body or IAC valve, must do this.

INSPECT THROTTLE BODY

Check that there is no clearance between each throttle stop screw and the throttle lever when applying the vacuum (53.3 kPa (400 mmHg, 15.7 in.Hg)) to the throttle opener using a MITYVAC (Hand-Held Vacuum Pump).
Standard: Must have no clearance

Fig 1: Checking Clearance Between Each Throttle Stop Screw And Throttle Lever
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: As the throttle stop screw is precisely adjusted, so do not adjust it.

Under the condition of (1), check visually that there is a clearance between each adjust screw and the throttle lever on No.1 side.

ADJUST SCREW REFERENCE VALUE

Adjust screw	Reference value
Close side	About 0.13 mm (0.0051 in.)
Open side	About 0.22 mm (0.0087 in.)

Fig 2: Checking Clearance Between Each Adjust Screw And Throttle Lever On No.1 Side

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the clearance between the adjust screw on the close side when fully opening the throttle lever on No.2 side by hand and the throttle lever on No.1 side with a feeler gauge.
Standard value: 0.25 - 0.45 mm (0.0098 - 0.0177 in.) In case of being out of standard value, perform the adjustment of step 2.

Fig 3: Measuring Clearance Between Adjust Screw On Close Side

ADJUST THROTTLE BODY (BALANCE)
NOTE: Do not adjust the throttle stop screw and throttle opener.
1. Beforehand checking.
  Recheck 1 - (a) 1.
2. Adjustment of the adjust screw on the open side.
  1. Using a 2 mm hexagon wrench, loosen the lock nut and screw, make clearance between the screw tip and the throttle lever on No.1 side.
  2. Turn the screw to the screw torque direction gradually, and stop it at the position where to touch the lever at the very moment.
    
    Fig 4: Locating Adjust Screw
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: If turning it too much to the torque direction, the No.1 lever goes off from the throttle stop screw causing the adjustment failure.
  3. Turn it back from the position where it touches the lever to the screw loosing direction.
    Standard: Turn it back by rotating 1/4
  4. Tighten the lock nut.
3. Adjustment of the adjust screw on the close side.
  1. Loosen the lock nut and screw, and make clearance between the screw tip and the throttle lever on No.1 side.
  2. Turn the screw to the screw torque direction gradually, and stop it at the position where to touch the lever at the very moment.
    
    Fig 5: Making Clearance Between Screw Tip And Throttle Lever On No.1 Side
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: If turning it too much to the torque direction, the No.2 lever goes off from the throttle stop screw causing the adjustment failure.
  3. Turn it back from the position where it touches the lever to the screw loosing direction.
    Standard: Turn it back by rotating 1/2 - 3/4
  4. Tighten the lock nut.
4. Completion checking.
  Check 1 - (c) c.