Engine Starting System - 2001 Chevy Venture
There was a post in the automotive forums recently asking about
the Engine Starting System operation.
Here is some information I gathered from a couple of repair manuals that
might help in troubleshooting and repairing
any problems that you might have in this area.
Engine Starting System - Description
The starting system
includes the following major components:
- Starter & Battery
- Starter Relay (see
- Two (2) fuses
(10 Amp fuse #11 [PCM, Ignition Crank] & #50 [Ignition Main
Relay & PCM])
- Ignition Switch and Park/Neutral
- Power train Control Module (PCM)
- All associated wiring & connectors,
including a "Fusible link"
- 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
- A fusible link protects starter
relay and solenoid from excess current.
Here is the schematic for the engine
starting system. Click on it for a larger view.
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