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Home >> Infiniti >> 2018 >> Q60 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System (Introduction) (2.0L)) >> System Description >> System >> Starter Motor Drive Control >> System Description >> Control Flow

Control Flow

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During Engine Start with Ignition Switch 

GNSJSBIA3739GB-739Courtesy of NISSAN NORTH AMERICA, INC.

*: Fuse and Fusible Link Block

When the engine is started with ignition switch operation, ECM turns ON the starter relay to activate the starter motor. This allows the starter motor to start the engine.

During Engine Restart by Stop/Start System 

GNSJSBIA3740GB-740Courtesy of NISSAN NORTH AMERICA, INC.

*: Fuse and Fusible Link Block

When engine is restarted, ECM turns ON the starter relay. At the same time, EMCM turns ON the engine restart bypass control relay and activates the engine restart bypass relay. When the starter motor is rotating, EMCM turns OFF the engine restart bypass control relay to deactivate the engine restart bypass relay.

Relay Activation Matrix 

Condition

Relay

Starter relay

Engine restart bypass relay

Sub battery relay

Engine start with ignition switch

ON

OFF

OFF

Engine restart by start/stop system

ON

ON * -> OFF

OFF

Engine running

OFF

OFF

ON

*: Instantaneously right after the restart.