steering wheel FORD MUSTANG 2003 Owner's Manual
[x] Cancel search | Manufacturer: FORD, Model Year: 2003, Model line: MUSTANG, Model: FORD MUSTANG 2003Pages: 4378, PDF Size: 66.11 MB
Page 95 of 4378

condition. It may not always be necessary to follow a pinpoint test to its conclusion. Carry out only the
steps necessary to correct the condition. Then, test the system for normal operation. Sometimes, it is
necessary to remove various vehicle components to gain access to the component requiring testing.
Reinstall all components after verifying system operation is normal.
PINPOINT TEST A: BRAKE VIBRATION/SHUDDER
Test Step Result / Action to Take
A1 ROAD TEST THE VEHICLE—
LIGHT BRAKING z
Check that the wheel and tires are correct for the vehicle.
Inspect the tires for abnormal wear patterns.
z Road test the vehicle. Warm the brakes by slowing the vehicle
a few times from 80– 32 km/h (50 to 20 mph) using light braking
applications. At highway speeds of 89–97 km/h (55- 60 mph),
apply the brake using a light pedal force.
z Is there a vibration/shudder felt in the steering wheel, seat
or brake pedal? Yes
GO to
A4 .
No
GO to A2 .
A2 ROAD TEST THE VEHICLE—
MODERATE TO HEAVY
BRAKING z
Road test the vehicle. At highway speeds of 89–97 km/h (55- 60
mph), apply the brake using a moderate to heavy pedal force.
z Is there a vibration/shudder? Yes
For vehicles with ABS,
GO to
A3 . For vehicles
with standard brakes,
GO to A4 .
No
Vehicle is OK. VERIFY
condition with customer.
TEST the vehicle for
normal operation. A3 NORMAL ACTUATION OF THE ABS SYSTEM DIAGNOSIS
z
During moderate to heavy braking, noise from the hydraulic
control unit (HCU) and pulsation in the brake pedal can be
observed. Pedal pulsation coupled with noise during heavy
braking or on loose gravel, bumps, wet or snowy surfaces is
acceptable and indicates correct functioning of the ABS
system. Pedal pulsation or steering wheel nibble, (frequency is
proportioned to the vehicle speed) indicates a concern with a
brake or suspension component.
z Is the vibration/shudder vehicle speed sensitive? Yes
GO to
A5 .
No
The brake system is
operating correctly. A4 APPLICATION OF THE PARKING BRAKE
z
NOTE: Begin at the front of the vehicle unless the vibration or
shudder has been isolated to the rear.
z This test is not applicable to vehicles with drum- in-hat type
parking brakes. For vehicles with drum- in-hat parking brakes,
proceed to the next test. For all other vehicles, apply the
parking brake to identify if the problem is in the front or rear
brake. At highway speeds of 89–97 km/h (55- 60 mph), lightly
apply the parking brake until the vehicle slows down. Release
the parking brake immediately after the test.
z Is there a vibration/shudder? Yes
GO to
A7 .
No
GO to A5 .
A5 CHECK THE FRONT WHEEL BEARINGS
z
Check the front wheel bearings. Refer to Wheel Bearing Check in this section.
z Are the wheel bearings OK? Yes
GO to
A6 . Klj . 48 ba
702003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...
Page 98 of 4378

PINPOINT TEST C: ACCESSORY DRIVE BEARING HOOT
PINPOINT TEST D: POWER STEERING MOAN
PINPOINT TEST E: ENGINE DRIVEN COOLING FAN MOAN operating correctly?
No
INSTALL a new valve lifter/lash adjuster
(s). TEST the system for normal
operation.
Test Step Result / Action to Take
C1 CHECK THE IDLER AND TENSIONER
PULLEY BEARINGS z
Carry out the Vehicle Cold Soak
Procedure in this section.
z Key in START position.
z Place an EngineEAR probe directly on the
pulley center post or bolt to verify which
bearing is making the noise.
z Key in OFF position.
z Is either bearing making the noise? Yes
INSTALL a new pulley/idler. CARRY OUT the
Vehicle Cold Soak Procedure and TEST the
system for normal operation.
No
CONDUCT a diagnosis on other suspect
accessory drive components.
Test Step Result / Action to Take
D1 CHECK THE POWER STEERING
SYSTEM z
Carry out the Vehicle Cold Soak
Procedure in this section.
z Key in START position.
z Turn the steering wheel while the noise
is occurring and listen for changes in
sound pitch or loudness.
z Key in OFF position.
z Does the sound pitch or loudness
change while turning the steering
wheel? Yes
GO to
D2 .
No
CONDUCT a diagnosis on other suspect
accessory drive components. D2 VERIFY THE SOURCE
z
Key in START position.
z Place an EngineEAR probe near the
power steering pump/reservoir while the
noise is occurring. While an assistant
turns the steering wheel, listen for
changes in sound pitch or loudness.
z Key in OFF position.
z Does the sound pitch or loudness
change while turning the steering
wheel? Yes
VERIFY that the supply tube to the pump is
unobstructed. CHECK the fluid condition and
level. DRAIN the fluid and REFILL. CARRY
OUT the Vehicle Cold Soak Procedure and
TEST the system for normal operation. REFER
to Section 211
- 02 .
No
Normal system operation. Test Step Result / Action to Take
E1 CHECK THE ENGINE DRIVEN COOLING
FAN AFTER A COLD SOAK Klj . 51 ba
702003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...