Toyota Celica 2005 Repair Manual page 358

15 Is there DTC P0171 or P0172 being output again?
NO
16 Confirm if vehicle has run out of fuel in past.
YES
DTC P0171 or P0172 is caused by running out
of fuel.
17 Perform confirmation driving pattern.
HINT:
Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14).
Go
18 Is there DTC P0171 or P0172 being output again?
Yes
19 Replace heated oxygen sensor.
Go
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (1ZZ−FE)
YES Replace ECM (See page SF−78) and perform
confirmation driving pattern (Refer to step 14).
NO Check for intermittent problems (See page
DI−3).
No Go to step 22.
357
DI−159