Toyota Celica 2005 Repair Manual page 372

18 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
19 Check result of step 4 switch step by number of misfire cylinder.
High misfire rate cylinder
1 or 2 cylinders
more than 3 cylinders
A
Check intermittent problems (See page
DI−3).
2005 CELICA (RM1131U)
DIAGNOSTICS
Acceptable
60 80 100
(104) (140) (176) (212)
A21416
− ENGINE (1ZZ−FE)
(a) Remove the engine coolant temperature sensor.
(b) Measure the resistance between the terminals of the en-
gine coolant temperature sensor.
Standard:
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 (warm up or allow to cool down) and repeat the test.
engine coolant temperature sensor.
NG Replace
B Go to step 5.
371
Temperature Specified Condition
20_C (68_F) 2.32 to 2.59 kΩ
80_C (176_F) 0.310 to 0.326 kΩ
Proceed to
A
B
DI−173