Ford 2003 Mustang Workshop Manual page 2038

Symptom Chart
SYMPTOM CHART
Condition
The engine does
not crank and the
relay does click
The engine does
not crank and the
relay does not
click
The engine
cranks slowly
Unusual starter
noise
The starter spins
but the engine
does not crank
Pinpoint Tests
PINPOINT TEST A: THE ENGINE DOES NOT CRANK AND THE
RELAY DOES CLICK
A1 CHECK THE VOLTAGE TO THE STARTER RELAY
Measure the voltage between the starter relay pin 30,
circuit 1050 (LG/VT) and ground.
Possible Sources
Battery.
Fuse.
Starter
motor/solenoid.
Ignition switch.
Circuit.
Fuse.
Battery.
Starter relay.
Ignition switch.
Digital transmission
range (TR) sensor.
Starter solenoid.
Clutch pedal
position (CPP)
switch.
Circuit.
Battery.
Starter
motor/solenoid.
Circuit.
Starter motor
mounting.
Starter motor.
Incorrect starter
drive engagement.
Starter Motor
Damaged
flywheel/ring gear
teeth.
Test Step
Action
Go To Pinpoint Test A .
Go To Pinpoint Test B .
Go To Pinpoint Test C
Go To Pinpoint Test D
INSPECT the starter motor
mounting and engagement.
REPAIR as necessary.
INSPECT the flywheel/ring
gear for damaged, missing or
worn teeth. REPAIR as
necessary.
Result / Action to Take
Yes
GO to A2 .
No
REPAIR circuit 1050 (LG/VT)
.
.