Starting System: Description and Operation

Fig.1 Starting System Schematic:

The starting system has (Fig. 1):
- Ignition switch
- Starter relay
- Transmission Range Sensor or Park-Neutral Switch
- Wiring harness
- Battery
- Starter motor with an integral solenoid
- Powertrain Control Module (PCM)

These components form two separate circuits. A high amperage circuit that feeds the starter motor up to 300+ amps, and a control circuit that operates on less than 20 amps.

The PCM controls a double start over-ride safety that does not allow the starter to be engaged if the engine is already running.