Toyota ZZT230 series Repair Manual page 291

INSPECTION PROCEDURE
HINT:
fr e eze
frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
Read
t h e engi n e
when
conditions
whether the vehi c l e was
running or stopped, the engine warmed up or not, the air-fuel ratio lean
of
at the time the malfunction.
1 Are there any other codes (besides DTC P0420) being output?
2 Check gas ieakede on exhaust system.
3 Check oxygen sensor (bank 1 sensor
4
Check oxygen sensor (bank 1 sensor 2) (See page Di--58).
Replace three-way catalytic converter.
-
the malfunction is detected, when troubleshooting it is useful for determining
e l van t DTC chart.
e
Go to r
Repair or replace.
1) (See
page Di-49).
r or re p
l a
e e
R pa c .
i
Repair or repla ce.
or ri c h,
etc.