Toyota Celica 2005 Repair Manual page 628

5 Check for open and short in harness and connector between ECM and heated
oxygen sensor (Bank 1 Sensor 1) (See page IN−30).
Reference (Bank 1 Sensor 1 System Drawing):
EFI Fuse
From
Battery
From
Terminal 6 of
Ignition Switch
OK
6 Check air induction system.
CHECK:
Check the air induction system for vacuum leaks.
OK
7 Check fuel pressure (See page SF−6).
CHECK:
Check fuel pressure (high or low pressure).
OK
2005 CELICA (RM1131U)
DIAGNOSTICS
EFI Relay
Heated Oxygen Sensor
Ground Ground
NG
NG
NG
− ENGINE (2ZZ−GE)
Heater
Sensor
Repair or replace harness or connector.
Repair or replace air induction system.
Check and repair fuel pump, fuel pipe line and
filter (See page SF−1).
627
ECM
HT1A
OX1A
Duty
Control
DI−429
A21253