Toyota 1 MZ–FE Manual page 488

EG2–488
INSPECTION PROCEDURE
Check air induction system (See page EG2–221).
Check for– heated oxygen sensor data.
1MZ–FE ENGINE – CIRCUIT INSPECTION
Repair or replace.
(1) Remove the fuse cover on the instrument
panel.
(2) Connect the OBDII scan tool or TOYOTA
hand–held tester to the DLC 3.
(3) Warm up engine to normal operating temper–
ature.
Read the heated oxygen sensor output voltage and
short–term fuel trim.
Read the values for the same bank.
Pattern
Check for heated oxygen sensor
(See page EG2–476).
Heated oxygen sensor
out put voltage
Lean condition
Changes at 0.55 V or
less
Rich condition
Changes at 0.4 V or
more
Short–term
fuel trim
Changes at
about + 20%
Changes at
about – 20%