Toyota 1 MZ–FE Manual page 514

EG2–514
DIAGNOSTIC CHART
TOYOTA hand–held tester
Connect the TOYOTA hand–held tester and read
value of EGR gas temperature.
Check for open in harness or ECM.
Check for open in harness or ECM.
Confirm connection at ECM, If OK, replace ECM.
Check connection of vacuum hose, EGR hose.
Check the VSV for EG R,
Check operation of the VSV for EG R.
Check for short in harness and connector between VSV
and ECM.
1MZ–FE ENGINE – CIRCUIT INSPECTION
Go to step
Confirm good connection at sensor.
If OK, replace EGR gas temp. sensor.
Open in harness between terminals E2
or THG. Repair or replace harness.
Repair or replace.
Go to step
Replace VSV for EG R.