Toyota 1 MZ–FE Manual page 545

Check operation of the IAC valve
Check and replace ECM (See page IN–36).
1MZ–FE ENGINE – CIRCUIT INSPECTION
Remove IAC valve (See page EG2–274).
(1) Connect the positive (+) lead from the bat–
tery to terminal B and negative (–) lead to
terminal RSC, and check that the valve is
closed.
(2) Connect the positive (+) lead from the bat–
tery to terminal B and negative (–) lead to
terminal RSO, and check that the valve is
open.
(1) The valve moves to close direction.
(2) The valve moves to open direction.
The ACTIVE TEST mode of the TOYOTA hand–
held tester can be used to change the duty of the
IAC valve as desired.
Repair or replace IAC valve.
EG2–545