Starting System: Description and Operation

Starting System

COMPONENT LOCATION

NOTE:
Installation on supercharged engine shown, installation on naturally aspirated engine similar.





INTRODUCTION
The starter motor is manufactured by Denso and is rated at 1.8 kW. The motor is geared directly to the pinion. The motor is a series wound motor with an overrunning clutch. The interior of the motor is ventilated through a breather tube attached to the underside of the motor housing.
The starter motor is located on the rear right side of the engine sump body. The motor is installed in an aperture in the sump body and the pinion is engaged with the ring gear of the flexplate assembly. A ground cable for the starter motor is connected to one of the starter motor securing points.
A heat shield is attached to the starter motor, at the point closest to the exhaust manifold and catalytic converter.
A heavy duty cable, which supplies the electrical power to turn the starter motor, is connected to the battery positive terminal via the positive remote charge terminal and a 400 A megafuse.
At the starter motor, the cable is connected to a copper terminal plate. The terminal plate and a heavy duty cable from the generator are connected to a terminal stud on the solenoid. The power feed from the starter relay, to energize the solenoid, is connected to a second terminal stud on the solenoid.

Starter Motor Assembly









CONTROL DIAGRAM









PRINCIPLES OF OPERATION
Engine crank requests are monitored by the passive anti-theft system and, if valid, passed on to the ECM (engine control module). For additional information, refer to Anti-Theft - Passive (419-01B Anti-Theft - Passive, Description and Operation).
When the ECM (engine control module) receives a crank request, it energizes the starter relay in the power distribution box. The energized starter relay supplies power from the CJB (central junction box) to energize the starter solenoid. The energized solenoid then connects the power feed from the battery to the starter motor via the positive remote charge terminal.