Toyota Celica 2005 Repair Manual page 269

DI−70
3 Check voltage between terminals HT1, HT2 of ECM connectors and body
ground.
ON
HT1A
A09084
NG
4 Check for open and short in harness and connector between heated oxygen
sensor and ECM, heated oxygen sensor and EFI main relay (Marking: EFI) (See
page IN−30).
OK
Replace ECM (See page SF−78).
2005 CELICA (RM1131U)
DIAGNOSTICS
HT1B
A09092
− ENGINE (1ZZ−FE)
PREPARATION:
(a) Remove the ECM cover.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals HT1A, HT1B of ECM con-
nectors and body ground.
HINT:
Connect terminal HT1A to bank 1 sensor 1.
S
Connect terminal HT1B to bank 1 sensor 2.
S
OK:
Voltage: 9 to 14 V
OK Replace ECM (See page SF−78).
NG Repair or replace harness or connector.
268