Toyota T100 1996 Service Manual page 494

DI−230
4 Check IAC valve (See page SF−39).
OK
Check for open and short in harness and
connector between R/B No.2 and IAC valve,
IAC valve and ECM (See page IN−26).
5 Check operation of the IAC valve (See page SF−43).
OK
Check and replace ECM (See page IN−26).
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS − ENGINE (5VZ−FE)
NG Replace IAC valve.
NG Repair or replace IAC valve.