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Action
Possible Sources
Symptom
Certain amount of noise level
acceptable, not a safety critical
item.
Power steering return lines.
Power steering system knock/
clonk noise – sounds almost
identical to column knock that
occurs when driving and
cornering over cobbled stones or
rough roads. Noise may appear
to emanate from a location closer
to the floor than that for column
knock (Sounds like metallic noise
but is created by pressure
impulse in gear and return line –
similar to a sound like quickly
turning off a water tap). Certain amount of noise level
acceptable, not a safety critical
item.
High power assist gain of power
steering gear valve (steering gear
design - no quality issue).
Certain amount of noise level
acceptable, not a safety critical
item.
High power steering pump flow
rate (by design).
Power Steering Column Knock Noise
Test Condition
Listen for steering knock noise in the following test
conditions with windows closed. 1. Drive over cobbled stones at low speed 16-40
km/h (10-25 mph) with and without steering
input carefully listening for knock sounds.
2. Drive over straight tar strips, road rails or 25 mm tall harshness strips at low speed 16-40 km/h
(10-25 mph) both driving straight and with
moderate cornering.
Action
Possible Sources
Symptom
CHECK the steering column
retaining bolts and attachments
to the steering column and
secure if necessary.
Steering column or steering
column shaft.
Power steering system column
knock noise – a loose sounding
rattle or vibration coming from the
column. Noticeable by hearing
and touch. Check steering column and
intermediate shaft for free play or
loose components.
REFER to:
Steering System (211-
00 Steering System - General
Information, Diagnosis and
Testing).
Power Steering Toc-Toc Noise
Test Condition
Listen for steering toc-toc noise with the engine
speed at idle and the vehicle parked, automatic
transmission in "P" (PARK) or manual transmission
in neutral and the windows closed. 1. Turn the steering wheel from left to right abruptly
changing direction.
2. Drive the vehicle for low speed parking manoeuvres constantly changing steering
direction.
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Action
Possible Sources
Symptom
Certain amount of noise level
acceptable, not a safety critical
item.
Steering gear (design tolerance
in steering rack).
Power steering system toc-toc
noise – a metallic noise created
when changing direction of
steering wheel rotation during
parking manoeuvre or at stand-
still.
Power Steering Grinding Noise
Test Condition
Listen for steering grinding noise with the engine
speed at idle and the vehicle parked, automatic transmission in "P" (PARK) or manual transmission
in neutral and the windows closed.
1. Slowly turn the steering wheel from lock to lock.
2. Tilt and extend the steering column in various
positions and slowly turn the steering wheel
from lock to lock.
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Action
Possible Sources
Symptom
Certain amount of noise level
acceptable, not a safety critical
item.
Steering wheel to shroud interfer-
ence.
Power steering system grinding
noise – an abrasive noise (like
sand paper rubbing against
wood) occurs between moving
components such as steering
wheel and the steering column
shroud. Certain amount of noise level
acceptable, not a safety critical
item.
Steering column bearing.
CHECK if floor covering is
obstructing the steering gear
pinion.
Foreign material in contact with
the steering column shaft.
CHECK the installation of the
floor seal.
CHECK the clockspring and
secure if necessary.
REFER to:Clockspring (501-20
Supplemental Restraint
System, Removal and Installa-
tion).
Clockspring.
Power Steering Zip Noise
Action
Possible Sources
Symptom
Certain amount of noise level
acceptable, not a safety critical
item.
High viscosity of power steering
fluid at low temperature.
Power steering system zip noise
– occurs when hydraulic fluid
does not flow freely through the
power steering pump supply hose
from steering fluid reservoir to
power steering pump causing
cavitation at the pump. Zip is
primarily a cold weather start-up
phenomenon (below -10°C). BLEED the power steering
system.
REFER to:
Power Steering
System Vacuum Bleeding (211-
00 Steering System - General
Information, General Proced-
ures).
Aeration of the power steering
fluid.
Driveline Noise and Vibration
Action
Possible Sources
Symptom
GO toPinpoint Test A.
• Wheel end vibration.
• Engine/transmission.
Shake and vibration while driving
GO toPinpoint Test B.
• Air cleaner.
• Power assisted steering.
• Powertrain.
• Powertrain/drivetrain mounts.
• Exhaust system.
Tip-in moan
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Action
Possible Sources
Symptom
GO toPinpoint Test C.
• Cable(s)/hose(s).
• Powertrain/drivetrain mounts.
• Exhaust system.
• Belt/pulleys.
Idle boom/shake/vibration/
shudder
Suspension Noise and Vibration
Action
Possible Sources
Symptom
GO toPinpoint Test D.
• Suspension.
• Wheel bearings.
Wheel end vibration analysis
GO toPinpoint Test E.
• Trim panels.
• Air conditioning (A/C) system.
• Accessories.
Non-axle noise
Pinpoint Tests
NOTE:
These Pinpoint Tests are designed to take
the technician through a step-by-step diagnosis
procedure to determine the cause of a condition.
It may not always be necessary to follow the chart
to its conclusion. Carry out only the pinpoint test steps necessary to correct the condition. Then
check the operation of the system to make sure
the condition has been corrected.
After verifying that the condition has been
corrected, make sure all components removed
have been installed.
PINPOINT TEST A : SHAKE AND VIBRATION WHILE DRIVING
DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
A1: NEUTRAL COAST
1 Carry out the neutral coast test.
• Does the vibration disappear during the neutral coast test?
zYe s
GO to A2.
zNoGO to Pinpoint Test D.
A2: CHECK THE POWERTRAIN/DRIVETRAIN MOUNTS
1 Carry out the powertrain/drivetrain mount neut-
ralizing procedure
• Are the mounts OK?
zYe s Vehicle condition corrected. ROAD TEST as
necessary.
zNoINSTALL new powertrain/drivetrain mounts
as necessary. ROAD TEST as necessary.
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PINPOINT TEST B : TIP-IN MOAN
DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
B1: CHECK THE AIR CLEANER
1 Check the condition of the air cleaner mounts,
inlet tube, outlet tube, resonators and all other
components associated with the air induction
system for correct installation and tightness of
all connections.
• Are the components OK?
zYe s GO to B2.
zNoREPAIR or INSTALL new components as
necessary. ROAD TEST as necessary.
B2: CHECK THE EXHAUST SYSTEM
1 Carry out the exhaust system neutralizing
procedure.
• Is the exhaust system OK?
zYe s GO to B3.
zNoREPAIR as necessary. ROAD TEST as
necessary.
B3: CHECK THE POWER STEERING
1 Remove the accessory drive belt and test for
tip-in moan. REFER to:
Accessory Drive Belt (303-05 Accessory Drive
- 2.5L Duratec (147kW/200PS) - VI5, Removal
and Installation),
• Is the tip-in moan OK?
zYe s REPAIR the power steering as necessary.
REFER to: Steering System (211-00 Steering
System - General Information, Diagnosis
and Testing).
zNo
GO to B4.
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DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
B4: CHECK THE POWERTRAIN/DRIVETRAIN MOUNTS
1 Carry out the powertrain/drivetrain mount neut-
ralizing procedure
• Are the powertrain/drivetrain mounts OK?
zYe s Vehicle condition corrected. ROAD TEST as
necessary.
zNoINSTALL new powertrain/drivetrain mounts
as necessary. ROAD TEST as necessary.
PINPOINT TEST C : IDLE BOOM/SHAKE/VIBRATION/SHUDDER
DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
C1: CHECK THE CABLE/HOSES
1 Check the engine compartment for any
component that may have a touch condition
between the engine and body or chassis. For
example: control cable, air conditioning (A/C)
hoses, acceleration cable.
• Are the components OK?
zYe s GO to C2 .
zNo
REPAIR or INSTALL new components as
necessary. ROAD TEST as necessary.
C2: CHECK THE ENGINE COOLING RADIATOR
1 Check the engine cooling radiator mountings
and bushings for security and condition. Check
the radiator installation for any component that
may have a touch condition.
• Is the installation and bushings OK?
zYe s GO to C3 .
zNo
REPAIR or INSTALL new components as
necessary. ROAD TEST as necessary.
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DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
C3: CHECK THE EXHAUST SYSTEM
1 Carry out the exhaust system neutralizing
procedure.
• Is the exhaust system OK?
zYe s GO to C4 .
zNo
REPAIR as necessary. ROAD TEST as
necessary.
C4: CHECK THE POWERTRAIN/DRIVETRAIN MOUNTS
1 Carry out the powertrain/drivetrain mount neut-
ralizing procedure
• Are the powertrain/drivetrain mounts OK?
zYe s Vehicle condition corrected. ROAD TEST as
necessary.
zNoINSTALL new powertrain/drivetrain mounts
as necessary. ROAD TEST as necessary.
PINPOINT TEST D : WHEEL END VIBRATION ANALYSIS
DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
D1: INSPECT THE WHEELS AND TIRES
1 Inspect the wheels and tires.
REFER to:
Wheels and Tires (204-04 Wheels
and Tires, Diagnosis and Testing).
• Are the wheels and tires OK?
zYe s GO to D2 .
zNo
INSTALL new wheels or tires as necessary.
REFER to: Wheel and Tire (204-04 Wheels
and Tires, Removal and Installation).
ROAD TEST as necessary.
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DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
D2: INSPECT THE WHEEL BEARINGS
1 Inspect the wheel bearings.
• Are the wheel bearings OK?
zYe s GO to D3 .
zNo
INSTALL new wheel bearings as necessary.
REFER to: Front Wheel Bearing (204-01 Front
Suspension, Removal and Installation).
ROAD TEST as necessary.
D3: INSPECT THE WHEEL AND TIRE RUNOUT
1 Inspect the wheel and tire runout.
• Is the wheel and tire runout OK?
zYe s Balance the wheels and tires. Refer to the
wheel balance equipment manufacturer's
instructions. ROAD TEST as necessary.
zNoINSTALL new wheels or tires as necessary.
REFER to: Wheel and Tire (204-04 Wheels
and Tires, Removal and Installation).
ROAD TEST as necessary.
PINPOINT TEST E : NON-AXLE NOISE
DETAILS/RESULTS/ACTIONS
TEST CONDITIONS
E1: INSPECT THE VEHICLE TRIM
1 Check the radiator grille and trim panels to see
if they are the source of the noise.
• Are the vehicle trim components causing the noise?
zYe s
INSTALL new trim components or REPAIR as
necessary. ROAD TEST as necessary.
zNoGO to E2.
E2: CHECK THE AIR CONDITIONING (A/C) SYSTEM FOR NOISE
1 Ignition switch in position III.
2Ignition switch in position II.
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