Starting System: Description and Operation

Fig. 1 Starting System Schematic:

STARTING
The starting system has (Fig. 1):
- Ignition switch
- Starter relay
- Clutch pedal mounted starter interlock switch
- Wiring harness
- Battery
- Starter motor with an integral solenoid

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.

SAFETY SWITCHES
For diagnostics of the Transmission Range Sensor, refer to the Transaxle for more information.

If equipped with Clutch Interlock/Upstop Switch, refer to Diagnosis and Testing in the Clutch.

IGNITION SWITCH
After testing starter solenoid and relay, test ignition switch and wiring. Refer to the Ignition or Wiring Diagrams for more information. Check all wiring for opens or shorts, and all connectors for being loose or corroded.

STARTER SOLENOID
The Starter Solenoid is mounted directly to the Starter Motor.

The Starter Solenoid is a switching device used to activate the high amperage starter motor circuit from a low amperage control circuit.

STARTER MOTOR RELAY
The Starter Relay is an ISO (International Standards Organization) relay located in the Power Distribution Center (PDC), positioned in the left side of the engine compartment.

As battery power is applied to the relay from the ignition switch, battery power is applied to the starter motor through the relay to the starter solenoid.

The starter relay ground is provided by the PCM. When the starter interlock (clutch pedal mounted) switch contacts are closed, the PCM will supply the ground path for the starter relay at key ON. This will occur if the engine RPM is below a predetermined value.