Description & Operation

Corvette uses starter PG260 M which is serviceable only by complete replacement. Starter motor features pole pieces that are arranged around armature within starter housing. Drive housing encloses shift lever, shift lever mechanism, and solenoid plunger to protect them from exposure to ice, dirt, and other elements.

Models equipped with automatic transaxle utilize a Park/Neutral Position (PNP) switch or transaxle range switch incorporated within starter circuit to allow starter operation only when vehicle is in Park or Neutral. Models equipped with manual transaxle utilize a Clutch Pedal Position (CPP) switch incorporated within starter circuit to prevent starter operation with clutch pedal released, allowing starter operation only when clutch pedal is depressed. Moving ignition switch to CRANK position sends battery voltage signal through PNP switch (A/T) or CPP switch (M/T) on through theft deterrent relay and then to Body Control Module (BCM) for ground. BCM verifies it has received a valid theft password before energizing theft deterrent relay. Battery voltage signal is supplied to starter solenoid when theft deterrent relay is activated.

When voltage is applied to solenoid, voltage is applied to solenoid windings which causes movement of solenoid plunger and shift lever, causing drive pinion to engage flywheel and close solenoid switch contacts. See Fig 1 . When solenoid switch contacts close, starter motor energizes and cranks engine. As engine starts, pinion overrun clutch protects armature from excessive speed until ignition switch is opened and plunger return spring disengages pinion.

Fig 1: Illustrating Typical Cranking Circuit

Courtesy of GENERAL MOTORS CORP.