Copyright by Goodheart-Willcox Co., Inc.
After studying this chapter, you will be able to:
Explain how effi ciency is obtained by electronic engine controls.
Describe the operation of the electronic control module.
List the major circuits of the electronic control module.
Explain the operation of major input sensors.
Explain the operation of major output devices.
Describe the basic control loop of the computer control system.
Identify the key elements of an OBD II system.
Accessory equipment
sensors
Active testing
Adaptive strategy
Atmospheric sensors
Central processing
unit (CPU)
Closed loop
Control loop
Control module
Controller area net-
works (CAN)
Data bus
Data link connector
Diagnostic trouble
code (DTC)
Drive train sensors
Electric motor
Electronic control
module (ECM)
Electronic engine
control system
Electronic output
devices
Engine sensors
Failure record
Fixed memory
Freeze frame record
General-circuit failure
High-input failure
Input processor
Intrusive testing
Keep alive memory
(KAM)
Knock sensors
Long-term fuel trim
Low-input failure
Malfunction indicator
light (MIL)
Monitors
On-board diagnostics
generation one
(OBD I)
On-board diagnostics
generation two
(OBD II)
Open loop
Output devices
Output processor
Oxygen (O
2
) sensor
Passive testing
Pulse width
Range/performance
failure
Reference voltage
Rheostat
Sensors
Short-term fuel trim
Solenoid
Transducers
Virtual sensors
Volatile memory
X-by-wire
Know These Terms
117
Computer Control
Fundamentals
Chapter
7
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