03-06-2
Starting System
03-06-2
DESCRIPTION AND OPERATION (Continued)
Starter Motor
The starter motor ( 1 1 002) is a 1 2-volt unit that has the
starter solenoid ( 1 1390)mounted on the drive end
housing.
•
The motor is energized when the starter solenoid
contacts are closed.
•
This engages
the
starter drive ( 1 1 350) with the
flywheel ring gear and starts the engine.
•
An overrunning clutch in the starter drive protects
the
starter motor from excessive speed when the
engine starts.
•
The current flows through the solenoid energizing
coil until the solenoid plunger is at the end of its
travel.
•
The plunger then closes a set of contacts that
bypass the energizing coil, letting the holding coil
keep the starter drive engaged and passing starting
current to the starter motor.
Starter Motor, 3.8L Engine
STARTER MOTOR
11000
Starter Motor, 4.6L Engine
STARTER
MOTOR
11000
AJ0141·A
J5539-A
Starter Relay
The starter interrupt relay ( 14N089) consists of the
following:
•
pull-in coil
•
contacts
When the ignition switch is in the START position and
the selector lever is in NEUTRAL or PARK:
•
current passes from
the
(TR) sensor to
the
pull-in
coil.
•
pull-in coil is activated and pulls
the
contacts
together.
•
current passes through the starter relay from
the
engine compartment power distribution box to
the
starter solenoid ( 1 1 390).
The starter interrupt relay is energized by the anti-theft
controller and opens the starter circuit.
Sequence of Operation
When the ignition switch is turned to the START
position:
•
Voltage is provided to the starter solenoid (1 1 390).
The starter solenoid is energized directly from the
ignition circuit. A magnetic field is created in the
solenoid coil.
•
The iron plunger core is drawn into the solenoid coil.
•
A lever connected to the starter drive ( 1 1 350)
engages the drive pinion gear to the flywheel ring
gear.
•
When the iron plunger core is all the way into the
coil, its contact disc closes the circuit between
the
battery ( 1 0653) and the starter motor terminals.
•
The current flows to the motor and the drive pinion
gear cranks the flywheel (6375) and the engine
crankshaft
(6303).
•
As current flows to the motor, the solenoid pull-in
coil is bypassed.
•
The hold-in coil keeps the starter drive engaged
with the flywheel.
•
The starter drive remains engaged until the ignition
switch is released from the START position.
An overrunning clutch in the starter drive protects
the
starter motor ( 1 1 002) from excessive speeds during
the brief period before the driver releases
the
ignition
switch from the START position (as the engine starts).
DIAGNOSIS AND TESTING
Electrical Schematic
Refer to Electrical and Vacuum Troubleshooting
Manual, Cell 20, Starting System for schematic and
connector information.
1997 Thunderbird, Cougar July 1996
