Bolt

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:

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 Oil changing reminder system control Start-in-gear protection system control • Informs operator of total operating time.

• Informs operator of time for replacing engine oil on the basis of the maintenance schedule. • 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 sensor.

NOTE: The information related to the Caution system, Self-Diagnostic System, Total operating hour indication system and O2 feedback system are retained in ECM memory.

ECM