Starting System: Description and Operation

INTRODUCTION

Starting System Components:

The starting system has:
- Ignition switch
- Starter relay
- Powertrain Control Module (PCM) double start override
- Neutral starting and back up switch with automatic transmissions only
- Wiring harness
- Battery
- Starter motor with an integral solenoid
- Positive Temperature Coefficient (PTC) is the circuit protection for the ignition feed to the starter relay coil. The PTC is located in the Junction Block.

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.


SYSTEM OPERATION
Supply Circuit and Control Circuit
The starter system consists of two separate circuits:
- A high amperage supply to feed the starter motor.
- A low amperage circuit to control the starter solenoid.