Toyota Celica 2005 Repair Manual page 651

DI−452
5 Check engine coolant temperature sensor.
Ohmmeter
30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
−20 0 20 40
(−4) (32) (68)
S01196
TEMPERATURE _C (_F)
S01699
OK
6 Check for spark and ignition (See page IG−1).
OK
2005 CELICA (RM1131U)
DIAGNOSTICS
Acceptable
60 80 100
(104) (140) (176) (212)
A21258
− ENGINE (2ZZ−GE)
PREPARATION:
Remove the engine coolant temperature sensor.
CHECK:
Measure the resistance between the terminals of the engine
coolant temperature sensor.
OK:
Tester Connection
1 − 2
NOTICE:
If you check the engine coolant temperature sensor in wa-
ter, be careful not to allow water to go into the terminals. Af-
ter checking, dry the sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed en-
gine coolant temperature sensor and read the resistance. Use
an infrared thermometer to measure the engine temperature in
the immediate vicinity of the sensor. Compare these values to
the resistance/temperature graph. Change the engine temper-
ature (by warming up or cooling down) and repeat the test.
(a) Reinstall the engine coolant temperature sensor.
NG Replace engine coolant temperature sensor.
NG Repair or replace.
650
Temperature Specified Condition
20_C (68_F) 2.32 to 2.59 kΩ
80_C (176_F) 0.310 to 0.326 kΩ