Toyota Celica 2005 Repair Manual page 618

4 Check EFI relay.
OK
5 Check for open and short in harness and connector between ECM and heated
oxygen sensor (See page IN−30).
Reference (Bank 1 Sensor 1 System Drawing):
EFI Fuse
From
Battery
From
Terminal 6 of
Ignition Switch
OK
2005 CELICA (RM1131U)
DIAGNOSTICS
PREPARATION:
Remove the EFI relay from the engine room J/B.
CHECK:
Inspect the EFI relay.
OK:
Tester Connection
A19288
NG
EFI Relay
Heated Oxygen Sensor
Ground Ground
NG
− ENGINE (2ZZ−GE)
1 − 2
3 − 5
(Apply battery voltage to terminals 1 and 2)
Replace EFI relay.
Heater
Sensor
Repair or replace harness or connector.
617
Specified Condition
Continuity
No continuity
Continuity
ECM
HT1A
OX1A
Duty
Control
DI−419
A21253