engine FORD MUSTANG 2003 Workshop Manual

SPECIFICATIONS
SECTION 303-
05: Accessory Drive 2003 Mustang Workshop Manual General Specifications
Item Specification
Accessory drive belt 6 ribs
Supercharger drive belt 8 ribs
Torque Specifications Description Nm lb-
ft lb-
in Belt idler pulley bolt 25 18 —
Drive belt tensioner bolt —
3.8L 82 60 —
Drive belt tensioner bolt —
4.6L 10 — 89
Drive belt tensioner bolt —
Supercharged engine 25 18 —
Cooling hose mounting bolt 25 18 —
Belt idler support assembly bracket bolts 25 18 —
Air intake scoop bolts 25 18 —
Air intake scoop bracket bolt 25 18 —
Air intake scoop bracket nuts 25 18 —
Air intake scoop bracket throttle body nut 9 — 80
Exhaust gas recirculation (EGR) vacuum regulator solenoid bolts 10 — 89 Klj . 1 ba
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DIAGNOSIS AND TESTING
Accessory Drive
Inspection and Verification
1. Verify customer concern by running the engine.
2. Inspect the drive belt for chunking, fraying and wear.
3. Check the drive belt for correct routing.
Drive Belt Cracking/Chunking/Wear
V Ribbed Serpentine Drive Belt With Cracks Across Ribs
The accessory drive:
zhas a single serpentine drive belt.
z has an automatic drive belt tensioner.
z does not require adjustment.
V Ribbed Belt With Chunks of Rib Missing
Symptom Chart SECTION 303-
05: Accessory Drive 2003 Mustang Workshop Manual Klj . 1 ba
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Component Tests
Drive Belt Noise/Flutter
Drive belt chirp occurs due to pulley misalignment or excessive pulley runout. It can be the result of a
damaged pulley or an incorrectly aligned pulley.
To correct, determine the area where the noise comes from. Check each of the pulleys in that area
with a straightedge to the crankshaft pulley, looking for accessory pulleys out of position in the fore/aft
direction or at an angle to the straightedge.
Drive belt squeal is an intermittent noise that occurs when the drive belt slips on a pulley during certain
conditions, such as: engine start up, rapid engine acceleration, or A/C clutch engagement.
Drive belt squeal can occur:
zif any of the accessories are damaged, have a worn or damaged bearing, internal torsional
resistance above normal. All accessories should be rotatable by hand in the unloaded condition.
If not, inspect the accessory.
z if fluid gets on the drive belt. This includes power steering fluid, engine coolant, engine oil or air
conditioning system lubricant. If fluid does get on the drive belt during service, clean the drive
belt with soap and water and thoroughly rinse with clean water.
z NOTE: The drive belt tensioner arm should rotate freely without binding.
if the drive belt is too long. A drive belt that is too long will allow the drive belt tensioner arm to
go all the way to the arm travel stop under certain load conditions, which will release tension to
the drive belt. If the drive belt tensioner indicator is outside the installation wear range window,
install a new drive belt.
z if the drive belt tensioner is worn or damaged.
Belt Tension
NOTE: Drive belt tension is not adjustable.
The drive belt tensioner automatically adjusts drive belt tension. Symptom Chart Condition
Possible Sources Action
z Drive belt
noise, chirping,
flutter z
Defective/worn drive
belt.
z Misaligned pulley.
z Pulley runout.
z Damaged
accessories.
z Fluid contamination
of drive belt. z
GO to Component Tests, Drive
Belt, Noise/Flutter.
z Damaged or worn
drive belt tensioner. z
GO to Component Tests, Belt
Tensioner, Automatic.
z Premature
drive belt wear z
Defective drive belt.
z Misaligned pulley.
z Pulley runout.
z Damaged
accessories.
z Incorrectly installed
drive belt. z
GO to Component Tests, Drive
Belt Noise/Flutter and Drive
Belt Misalignment diagnosis. Klj . 2 ba
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Belt Tensioner, Automatic
Check the automatic drive belt tensioner:
1. With the engine off, check for correct drive belt routing; refer to Accessory Drive . Repair as
necessary.
2. Rotate the drive belt tensioner and check for a binding or frozen condition. Install new components as necessary.
Drive Belt Misalignment
CAUTION: Incorrect drive belt installation will cause excessive drive belt wear and may
cause the drive belt to come off the drive pulleys.
Non- standard drive belts may track differently or incorrectly. If a drive belt tracks incorrectly, install it
with an original equipment drive belt to avoid performance failure or loss of drive belt.
With the engine running, check drive belt tracking. If the (A) edge of the drive belt rides beyond the
edge of the pulleys, noise and premature wear may occur. Make sure the (B) drive belt rides correctly
on the pulley. If a drive belt tracking condition exists, proceed with the following:
zVisually check the drive belt tensioner for damage, especially the mounting pad surface. If the
drive belt tensioner is not installed correctly, the mounting surface pad will be out of position.
This will result in chirp and squeal noises.
z With the engine running, visually observe the grooves in the pulleys (not the pulley flanges or
the pulley forward faces) for excessive wobble. Install new components as necessary.
z Check all accessories, mounting brackets and the drive belt tensioner for any interference that
would prevent the component from mounting correctly. Correct any interference condition and
recheck the drive belt tracking.
z Tighten all accessories, mounting brackets, and drive belt tensioner retaining hardware to
specification. Recheck the drive belt tracking. Klj . 3 ba
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6. Remove auxiliary crankshaft pulley. For additional information, refer to
Section 303 - 01C .
All engines 7. Rotate the belt tensioner and remove the accessory drive belt.
8. NOTE: Make sure the accessory drive belt is correctly installed on each pulley.
To install, reverse the removal procedure. zRefer to Accessory Drive and
Accessory Drive — Cobra for accessory drive belt routing. Klj . 2 ba
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6. Remove the accessory drive belt. For additional information, refer to
Accessory Drive Belt —
4.6L (2V) and (4V) in this section.
7. Remove the accessory drive belt tensioner.
All engines 8. Remove the accessory drive belt. For additional information, refer to Accessory Drive Belt Tensioner — 4.6L (2V) and (4V) in this section.
9. Remove the belt tensioner. zRemove the bolt and the tensioner.
10. To install, reverse the removal procedure. Refer to Accessory Drive and
Accessory Drive —
Cobra for accessory drive belt routing. Klj . 2 ba
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All engines
6. Rotate the belt tensioner and position the accessory drive belt aside.
7. NOTE: The procedure listed below can be carried out on any of the 4.6L engine accessory drive
belt idler pulleys.
Remove the bolt and the belt idler pulley.
8. To install, reverse the removal procedure. Refer to Accessory Drive or
Accessory Drive — Cobra
in this section, for accessory belt routing. Klj . 2 ba
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SPECIFICATIONS
SECTION 303-
06: Starting System 2003 Mustang Workshop Manual General Specifications
Item Specification
Normal engine cranking speed rpm 100-
140 rpm Starter motor no load current draw amperes 60-
80 amps Starter motor normal load current draw 130 amps
Starter motor maximum load current draw amperes 400 amps
Maximum starting circuit voltage drop (engine at normal engine temperature) 0.5 volt
Torque Specifications Description Nm lb-
ft lb-
in Starter motor bolts 25 18 —
Starter motor ground cable nut 25 18 —
Starter motor solenoid S terminal nut 6 — 53
Starter motor solenoid B terminal nut 12 9 — Klj . 1 ba
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DESCRIPTION AND OPERATION
Starting System
Starter Motor
The starter motor is a 12-
volt unit that has the starter solenoid mounted on the drive end housing and
functions as follows:
zThe current flows through the solenoid energizing coil until the solenoid plunger is at the end of
its travel.
z The plunger 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.
z The motor is energized when the starter solenoid contacts are closed.
z The starter drive engages the flywheel ring gear and starts the engine.
z An overrunning clutch in the starter drive protects the starter motor from excessive speed when
the engine starts.
Starter Relay
The starter interrupt relay consists of:
zpull in coil and contacts
When the ignition switch is in the START position:
zthe pull- in coil is activated and pulls the contacts together.
z current passes through the starter relay from the engine compartment power distribution box to
the starter solenoid.
Clutch Pedal Position (CPP) Switch
The CPP switch for:
za manual transmission closes when the clutch pedal is depressed, completing the starting
circuit.
z an automatic transmission is a jumper inserted in place of the CPP switch to complete the
circuit.
Starter System — Operation
When the ignition switch is turned to the START position the starter relay switches power to the starter
solenoid causing the starter motor to engage as long as:
zthe clutch pedal is depressed (manual transmission only).
z the digital transmission range (TR) sensor is in PARK or NEUTRAL (automatic transmission
only).
SECTION 303-
06: Starting System 2003 Mustang Workshop Manual Klj . 1 ba
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Symptom Chart
Pinpoint Tests
PINPOINT TEST A: THE ENGINE DOES NOT CRANK AND THE
RELAY DOES CLICK
SYMPTOM CHART Condition
Possible Sources Action
z The engine does
not crank and the
relay does click z
Battery.
z Fuse.
z Starter
motor/solenoid.
z Ignition switch.
z Circuit. z
Go To Pinpoint Test A .
z The engine does
not crank and the
relay does not
click z
Fuse.
z Battery.
z Starter relay.
z Ignition switch.
z Digital transmission
range (TR) sensor.
z Starter solenoid.
z Clutch pedal
position (CPP)
switch.
z Circuit. z
Go To Pinpoint Test B .
z The engine
cranks slowly z
Battery.
z Starter
motor/solenoid.
z Circuit. z
Go To Pinpoint Test C .
z Unusual starter
noise z
Starter motor
mounting.
z Starter motor.
z Incorrect starter
drive engagement. z
Go To Pinpoint Test D .
z The starter spins
but the engine
does not crank z
Starter Motor zINSPECT the starter motor
mounting and engagement.
REPAIR as necessary.
z Damaged
flywheel/ring gear
teeth. z
INSPECT the flywheel/ring
gear for damaged, missing or
worn teeth. REPAIR as
necessary. Test Step Result / Action to Take
A1 CHECK THE VOLTAGE TO THE STARTER RELAY
z
Measure the voltage between the starter relay pin 30,
circuit 1050 (LG/VT) and ground. Yes
GO to
A2 .
No
REPAIR circuit 1050 (LG/VT) Klj . 2 ba
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