Cranking Circuit
The cranking circuit consists of the following components:
• | The park/neutral switch |
• | The powertrain control module (PCM) |
• | The starter motor relay |
• | All related electrical wiring |
For detailed schematics of the starting system, refer to
Starting and Charging Schematics
.
Starter Motor
PG-260 Starter Motor
The PG-260 achieves gear reduction at a ratio of 5:1 through planetary gears.
The motor's relatively small size and light weight offers improved starting
performance and reduced current requirements for larger gasoline engines.
Do not overhaul the PG-260, it is serviced by replacement only.
The PG-260 has the shift lever mechanism and the solenoid plunger enclosed
in the drive housing in order to protect them from exposure to dirt, icing
conditions, and splash.
The solenoid windings energize when the ignition switch is in the START
position. The resulting plunger and the shift lever movement causes the
pinion to mesh with the engine flywheel ring gear, the solenoid main contacts
close, and engine cranking takes place. When the engine starts, the pinion
overrunning clutch protects the armature from excessive speed until the
ignition switch is released, at which time the plunger return spring causes
the pinion to disengage. In order to prevent excessive overrunning, release
the ignition switch immediately when the engine starts.