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Electronic Control System
Electronic Control System Components
Figure 36 Electronic Control System
Operation and Function
The Electronic Control Module (ECM) monitors and
controls engine performance to ensure maximum
performance and adherence to emissions standards.
The ECM has four primary functions:
1. Provides Reference Voltage (V
2. Conditions input signals
3. Processes and stores control strategies
4. Controls actuators
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
1 ENGINE SYSTEMS
1. Voltage reference(V
The ECM supplies a 5 volt V
in the electronic control system.
the 5 volt V
respective returned signals, the ECM determines
pressures, positions, and other variables important to
)
REF
engine and vehicle functions.
The ECM supplies two independent circuits for V
•
V
•
V
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
)
REF
REF
signal sent to the sensors with their
REF
A supplies 5 volts to engine sensors
REF
B supplies 5 volts to vehicle sensors
REF
43
signal to input sensors
By comparing
:
REF
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