Toyota 1 MZ–FE Manual page 596

EG2–596
DIAGNOSTIC CHART
TOYOTA hand–held tester
Connect the TOYOTA hand–held tester and check
operation of IACV control VSV.
Check IACV control VSV.
Check for open and short in harness and connector
between EFI main relay and ECM.
Check and replace ECM.
OBDII scan tool (excluding TOYOTA hand–held tester)
Check IACV control VSV.
Check voltage between terminal ACIS and body
ground.
Check vacuum tank.
Check and replace ECM.
1MZ–FE ENGINE – CIRCUIT INSPECTION
Check for vacuum tank.
Replace IACV control VSV.
Repair or replace harness or connector.
Replace IACV control VSV.
Check and repair harness or connector.
Repair or replace.