Toyota Celica 2005 Repair Manual page 605

DI−406
2 Check thermostat (See page CO−10).
OK
3 Check cooling system.
CHECK:
Check that there is defect cooling system which causes overcool, such as abnormal radiator fan operation,
modified cooling system and so on.
OK
Replace engine coolant temperature sensor.
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (2ZZ−GE)
NG Replace thermostat (See page CO−9).
NG Repair or replace cooling system.
604