Toyota 1 MZ–FE Manual page 542

EG2–542
DIAGNOSTIC CHART
Check air induction system.
Check A/C idle up VSV.
Check voltage terminals RSO, RSC.
Check IAC valve.
Check for open and short in harness and connector between
J/B No.2 and IAC valve, IAC valve and ECM.
Check operation of the IAC valve.
Check and replace ECM.
1MZ–FE ENGINE – CIRCUIT INSPECTION
Repair or replace.
Repair or replace.
G o to step
Replace IAC valve.
Repair or replace IAC valve.