Toyota Celica 2005 Repair Manual page 353

DI−154
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)
A21416
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)
A21416
− ENGINE (1ZZ−FE)
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 checking the engine coolant temperature sensor in
water, be careful not to allow water to go into the terminals.
After 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 (warm up or allow to cool down) and repeat the test.
NG Replace engine coolant temperature sensor.
NG Repair or replace.
352
Temperature Specified Condition
20_C (68_F) 2.32 to 2.59 kΩ
80_C (176_F) 0.310 to 0.326 kΩ