Toyota Celica 2005 Repair Manual page 696

INSPECTION PROCEDURE
Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air−fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
1 Are there any other codes (besides DTC P0420) being output?
If a DTC other than P0420 is set, troubleshoot for the DTC first.
RESULT:
P0420 and others
A
2 Check gas leakage on exhaust system.
OK
2005 CELICA (RM1131U)
DIAGNOSTICS
DTC
P0420
− ENGINE (2ZZ−GE)
B Go to relevant DTC chart (See page DI−335).
NG Repair or replace exhaust gas leakage point.
695
Proceed to
A
B
DI−497