Basic
Component Testing
Basic
Component Testing
This chapter describes a computer controlled sensor and actuator
system typically found on today's automobile.
Test procedures are also provided for the basic groups of electrical
input and output components commonly found in a computer
controlled automotive system. The test procedures are, due to the
complexity of components, general theory tests. Be sure to consult
the vehicle service manual for component schematics and test
specifications.
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Computer Controlled Systems
A
need for better fuel economy and lower emissions resulted in
today's automobiles utilizing computer controlled functions that were
previously activated by mechanical, electrical and vacuu'm devices.
Computerized vehicle control systems are made up of three basic
component groups. These groups are:
1.
Sensors: they are input devices that supply information about
engine operating conditions and the surrounding environment
to the vehicle computer.
2.
Engine Control Module: a vehicle computer that processes the
information supplied by the sensors, then sends an electronic
command to the appropriate component actuators.
3.
Actuators: these are output devices that may be electrical,
mechanical or vacuum components controlled by the vehicle
computer.
Typical Sensors
Typical Actuators
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