Toyota ZZT230 series Repair Manual page 274

Check for open and short In harness and connector between ECM a n d
8
sansor (See page IN-20).
Replace oxygen
9
Perform confirmation driving pattern (See page Dl-49).
10 Is there DTC
)
11
Did vehicle runs out of fuel In the past?
DTC P0171 or P0172 1s caused by running out
of fuel.
)
DIAGNOSTICS
sensor.
or being output again?
P0171 P0172
-
ENGINE
Repair or replace harness or connector.
Check and replace ECM.
Check for Intermittent problems.
Dl-63
oxygen