ENGINE CONTROL SYSTEM 3-5
COMPONENTS FOR SYSTEM CONTROL
ENGINE CONTROL MODULE (ECM)
The ECM sends signals to control the actuators based on the information inputs from each sensor/switch.
Major controls are as follows:
NOTE:
The information related to the Caution system, Self-Diagnostic System, Total operating hour indication sys-
tem and O2 feedback system are retained in ECM memory.
NAME OF CONTROL DESCRIPTION
Fuel injection control • Controls fuel injection amount and timing.
Ignition control • Controls ignition timing.
Idle air control • Controls idling/trolling speed by adjusting intake air amount through
IAC valve.
VVT system • Controls intake cam valve timing through OCV (Oil control valve).
Fuel pump control • Controls high pressure fuel pump drive.
• Controls Low pressure fuel pump drive.
Multi-stage induction system • Changing the length of intake manifold pipes according to engine
speed.
Evaporation purge system • Discharges vapor generated within fuel vapor separator to air intake
silencer case by controlling purge valve.
Caution system control • Informs operator of abnormal engine condition.
• Controls engine speed.
Self-diagnostic system control • Informs operator of sensor/switch malfunction.
Fail-safe system control • Allows operation with back-up system during sensor/switch
malfunction.
Total operating hour indication
system control
• Informs operator of total operating time.
Oil changing reminder system
control
• Informs operator of time for replacing engine oil on the basis of the
maintenance schedule.
Start-in-gear protection system
control
• Prevents engine start when shift is positioned in forward or reverse.
Starter motor relay control
system
• Prevents starter motor operation when engine is already operating.
O2 feedback system control • Controls and performs O2 feedback operation using optional O2 sen-
sor.
ECMECM
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