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Engine Starting System - Description
& Operation
The starting system
includes the following major components:
- Starter & Battery
- Starter Relay (see
relays)
- Two (2) fuses
(10 Amp fuse #11 [PCM, Ignition Crank] & #50 [Ignition Main
Relay & PCM])
- Ignition Switch and Park/Neutral
Position Switch
- Power train Control Module (PCM)
- All associated wiring & connectors,
including a "Fusible link"
Basic Operation:
- When the Ignition Switch is turned
to START, 12 Volts is sent through fuse #11 to the PCM (pin 23).
- If the transmission is in the Park
or Neutral position, 12 Volts is present at pin 85 of the Starter
Relay, and the PCM provides a Ground to pin 86 of the relay.
- When the Starter Relay closes, it
feeds current from the battery, through the starter solenoid, and to
the starter motor.
- When the Ignition Switch is
release, the starter relay opens and the starter solenoid
de-energizes.
Other information:
- A fusible link protects starter
relay and solenoid from excess current.
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