Toyota 4-Runner 1985 Repair Manual page 141

EMISSION CONTROL SYSTEMS (CARB.)
Air Suction and Fuel System
Feedback Control System EC-41
Ohmmeter
Ohmmeter
ECl17l
Ohmmeter
ECll72
INSPECTION OF THERMO SWITCH (2)
CHECK THERMO SWITCH BY USING OHMMETER
(a) Drain the coolant from the radiator into a suitable con-
tainer.
(b) Remove the thermo switch from the intake manifold.
(c) Cool the thermo switch to below 6°C (43°F).
(d) Using an ohmmeter, check that there is continuity.
(e) Heat the switch to above 18°C (64°F) with hot water.
(f) Check that there is no continuity.
(g) Apply liquid sealer to the threads of the switch and
reinstall.
(h) Fill the radiator with coolant.
A03059
INSPECTION OF EBCV
1. CHECK FOR SHORT CIRCUIT
Using an ohmmeter, check that there is no continuity be-
tween the positive
(+)
terminal and the EBCV body.
If there is continuity, replace the EBCV.
2.
CHECK FOR OPEN CIRCUIT
Using an ohmmeter, measure the resistance between the
positive
(+)
terminal and the other terminal as shown.
Specified resistance: 11 - 13
Q
at 20°C (68°F)
If the resistance is not within specification.
Replace the EBCV.
INSPECTION OF SPEED SENSOR
(See Page EC-25)