STARTING SYSTEMS
TABLE OF CONTENTS
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DESCRIPTION AND OPERATION
STARTING SYSTEM .......................1
STARTER RELAY .........................1
STARTER SOLENOID ......................1
MELCO STARTER (2.7L ENGINE).............1
NIPPONDENSO STARTER
(3.2 - 3.5L ENGINE) .....................1
SUPPLY CIRCUIT AND CONTROL CIRCUIT.....2
DIAGNOSIS AND TESTING
CONTROL CIRCUIT TEST...................2
FEED CIRCUIT RESISTANCE TEST............3
FEED CIRCUIT TEST.......................4
STARTING SYSTEM TEST ..................4
REMOVAL AND INSTALLATION
SAFETY SWITCHES .......................6
STARTER ...............................6
STARTER RELAY .........................7
SPECIFICATIONS
STARTER ...............................7
TORQUE ................................7
DESCRIPTION AND OPERATION
STARTING SYSTEM
DESCRIPTION
The starting system has (Fig. 1):
• Ignition switch
• Starter relay
• Transmission Range Sensor or Park/Neutral
Switch
• Wiring harness
• Battery
• Starter motor with an integral solenoid
• Powertrain Control Module (PCM)
OPERATION
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.
The PCM controls a double start over-ride safety
that does not allow the starter to be engaged if the
engine is already running.
STARTER RELAY
DESCRIPTION
The Starter Relay is a micro relay located in the
Power Distribution Center (PDC), positioned in the
left front corner of the engine compartment.
OPERATION
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 sole-
noid.
STARTER SOLENOID
DESCRIPTION
The Starter Solenoid is mounted directly to the
Starter Motor, mounted on the left side of the engine.
OPERATION
The Starter Solenoid is a switching device used to
activate the high amperage starter motor circuit from
a low amperage control circuit.
MELCO STARTER (2.7L ENGINE)
DESCRIPTION
The Melco is a permanent magnet starter motor.
OPERATION
A planetary gear train transmits power between
starter motor and pinion shaft. The fields have per-
manent magnets.
NIPPONDENSO STARTER (3.2 - 3.5L ENGINE)
DESCRIPTION
The Nippondenso is a reduction gear-field coil
starter motor.
OPERATION
Power is applied to the coil windings which causes
the pinion to rotate the ring gear mounted on the
drive plate.
LH STARTING SYSTEMS 8B - 1
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