AVALON, Highlander & Sienna
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Throttle body lever adjustment must be performed if throttle body or idle air control valve is replaced, or if throttle body or idle air control valve is removed and reinstalled. Perform preliminary inspection to determine if throttle body lever adjustment must be performed. Throttle stop screws and throttle opener are preset. DO NOT alter throttle stop screw or throttle opener adjustment.
- Preliminary Inspection
Using vacuum pump, apply 15.7 Hg in. of vacuum to throttle opener. Perform STEP 1 in illustration. See Fig 1. Ensure clearance exists at tip throttle opener and no clearance exists between throttle stop screws and throttle levers. Perform STEP 1 in illustration. See Fig 1. - Note location of No. 1 and 2 throttle bodies on No. 1 intake air control valve. Perform STEP 2 in illustration. See Fig 1. With 15.7 Hg in. of vacuum still applied to throttle opener, check that about .0051" (.130 mm) clearance exists between close side adjusting screw and throttle lever on No. 1 throttle body, and about .0087" (.220 mm) clearance exists between open side adjusting screw and throttle lever on No. 1 throttle body. Perform STEP 3 in illustration. See Fig 1.
- Release vacuum and disconnect vacuum pump. Fully open throttle lever on No. 2 throttle body and measure clearance between close side adjusting screw and throttle lever on No. 1 throttle body. Perform STEP 4 in illustration. See Fig 1. Clearance between close side adjusting screw and throttle lever on No. 1 throttle body should be .0098-.0177" (.250-.450 mm). If all clearances are as specified, throttle body lever adjustment is not required. If any clearance is not as specified, throttle body lever adjustment procedure must be performed. Proceed to adjustment procedure.
- Adjustment Procedure
Ensure preliminary inspection procedure is performed before performing adjustment procedure. Using vacuum pump, apply 15.7 Hg in. of vacuum to throttle opener. - To adjust open side adjusting screw, loosen lock nut on open side adjusting screw. See Fig 2. Loosen open side adjusting screw to provide clearance between open side adjusting screw and throttle lever on No. 1 throttle body. Tighten open side adjusting screw until it just contacts throttle lever on No. 1 throttle body. DO NOT rotate open side adjusting screw after it just contacts throttle lever or throttle lever on No. 1 throttle body will not contact throttle stop screw and improper adjustment will exist. Loosen open side adjusting screw 1/4 turn and tighten lock nut.
- To adjust close side adjusting screw, loosen lock nut on close side adjusting screw. See Fig 2. Loosen close side adjusting screw to provide clearance between close side adjusting screw and throttle lever on No. 1 throttle body. Tighten close side adjusting screw until it just contacts throttle lever on No. 1 throttle body. DO NOT rotate close side adjusting screw after it just contacts throttle lever or throttle lever on No. 2 throttle body will not contact throttle stop screw and improper adjustment will exist. Loosen close side adjusting screw 1/2-3/4 turn and tighten lock nut.
- After open and close side adjusting screws are adjusted, perform preliminary inspection procedure again to ensure proper throttle body lever adjustment.