Toyota 1 MZ–FE Manual page 474

EG2–474
DIAGNOSTIC CHART
Connect the OBDll scan tool or TOYOTA hand–held
tester and read value for voltage output of heated
oxygen sensor.
Check for open and short in harness and connector
between ECM and heated oxygen sensor.
Replace heated oxygen sensor.
WIRING DIAGRAM
1MZ–FE ENGINE – CIRCUIT INSPECTION
Check and replace ECM.
Repair or replace harness or connector.