Toyota Celica 2005 Repair Manual page 336

6 Check for open and short in harness and connector between ECM and 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
7 Check whether misfire is occurred or not by monitoring DTC and data list.
OK
8 Check air induction system (See page SF−1).
CHECK:
Check the air induction system for vacuum leaks.
OK
2005 CELICA (RM1131U)
DIAGNOSTICS
EFI Relay
Heated Oxygen Sensor
Ground Ground
NG
NG
NG
− ENGINE (1ZZ−FE)
Heater
Sensor
Repair or replace harness or connector.
Perform troubleshooting for misfire (See page
DI−161).
Repair or replace induction system.
335
ECM
HT1A
OX1A
Duty
Control
DI−137
A21410