User Manual

73
UT108/109 OPERATING MANUAL
UT108/109 OPERATING MANUAL
74
Testing Procedure:
(1) The same as in the resistance testing method.
(2) When the general temperature of a heating sensor rises, its resistance will drop. The
thermal resistance of the temperature sensor of the automotive engine is generally less
than 300 z.
3. Position Sensor (see gure 24)
The position sensor is an electrometer or variable resistance. It is used for the computer
monitoring of the position and direction of a mechanical device. The typical position
sensors include throttle, exhaust recalculating EGR, blade air ow and other sensors.
Testing Procedure:
(1) The same as in the resistance testing method.
(2) Connect the red and black test lead probes respectively to the signal test terminal and
ground terminal. Refer to various kinds of automotive servicing manuals for its position
and the resistance to be tested.