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WorksheetsIMI auto LV08 Chassis Diagnotics
Total questions: 47
Worksheet time: 35mins
This diagram represents a wave form from an inductive ABS sensor, As the wheel speed increases, the:
voltage remains the same and the frequency increases
voltage increases and the frequency increases
voltage increases and the frequency remains the same
voltage remains the same and frequency remains the same
During traction control operation
the brake is rapidly applied and released on the spinning wheel until traction is regained
the brake is applied on the non spinning wheel until traction is regained
the brake is applied on the spinning wheel until traction is regained
the brake is rapidly applied and released on the non spinning wheel until traction is regained
The definition of the term 'castor angle' is defined as
inclination of the road wheel relative to the vertical axis, when viewed from the side of the vehicle
angle of the road wheel steering axis relative to the vertical, as viewed from above the vehicle
angle of the road wheel steering axis relative to the vertical, as viewed from the side of the vehicle
inclination of the road wheel relative to the vertical axis, when viewed from the front of the vehicle
The electronic brake force distribution (EBD) system on a light vehicle controls the brake system by........
controls the braking force at the wheels by measuring the load applied to the front and rear axles
controls the braking force at the wheels by monitoring the slip ratio of the tyres on the road
controls the braking force at the wheels by monitoring the condition of the road surface through moisture and temperature sensors
controls the braking force at the rear wheels by reducing the brake force when the vehicle is unladen
An advanced ride control system, when applied to a light vehicle
monitors the pitch of the vehicle and is over-ridden by the drivers throttle and brake inputs
monitors the yaw of the vehicle and is over-ridden by the drivers throttle and brake inputs
monitors the pitch of the vehicle and over-rides the drivers throttle and brake inputs
monitors the yaw of the vehicle and over-rides the drivers throttle and brake inputs
When cornering, a vehicle with electronically controlled air suspension will,
immediately provide more air pressure to the air springs on the outside of the bend
provide more air pressure to the air springs on the outside of the bend after a short delay
immediately provide more air pressure to the air springs on the inside of the bend
provide more air pressure to the air springs on the inside of the bend after a short delay
The amount of assistance provided by an electronic power-assisted steering system is changed by
changing the voltage delivered to the motor in relation to the steering input shaft torque
changing the gear ratio between the steering column and torque control unit
changing the current delivered to the motor in relation to steering input shaft torque
Changing the gear ratio between the steering column and steering rack
One advantage of a vehicle fitted with EPAS over a vehicle fitted with hydraulic power steering is
less steering effort
no torque sensing required
reduced steering rack ratio
improved fuel economy
The diagram shows the layout of a communication network froma light vehicle. The system operates by
each control unit sending and receiving varying resistances through the data-bus
each control unit sending and receiving data packets through the data-bus
each control unit sending and receiving varying voltages through the data-bus
each control unit working completely independently from the others
On a vehicle fitted with an EPAS system the component that senses the drivers turning effort is a
torque sensor
control pump
steering speed sensor
flow control valve
When discussing the coefficient of friction, it can be said that
the coefficient of static friction is lower than the coefficient of dynamic fritcion
the coefficient of friction remains constant whether the surfaces are moving or static
the coefficient of dynamic friction is normally higher than the coefficient of static friction
the coefficient of static friction is normally higher than the coefficient of dynamic friction
During hard braking, an insecure load in the boot will slide forward due to
Normal force
gravitational force
inertia force
centrifugal force
A coil spring is subjected to three forces during normal operation. These forces are
compressive, shear and torsional
compressive, tensile and torsional
Tensile, compressive, shear
Shear, bending, compressive
An ABS warning light illuminates each time the vehicle goes around a left-hand corner. The fault indicates an intermittent fault of an incompatible speed signal from the nearside front sensor. The fault is most likely to be
a poor connection in the nearside front sensor wiring which goes open circuit each time the suspension compresses
excessive play in the front wheel bearing causing the sensor wheel to move away from the sensor during cornering and the signal voltage to drop
a poor connection in the nearside front sensor wiring which goes open circuit each time the suspension extends
Unequal air gap settings of the nearside front sensor and the offside front sensor which causes the signal to drop when cornering
A front wheel drive vehicle has a fault which causes the yellow traction control light to be illuminated when driving and the vehicle lacks power. On initial inspection the rear profiles are larger than the front tyres. The fault is most likely to be
fitting larger tyres to the rear has created unequal rolling radius of the wheels causing the front wheels to rotate faster than the rear wheels
fitting larger tyres to the rear has created unequal rolling radius of the wheels causing the front wheels to rotate slower than the rear wheels
fitting the larger profile tyres has disturbed the rear wheel speed sensors causing them to give an increased voltage output
Jacking up a vehicle has trapped the rear sensor wiring causing an open circuit
Which of the following checks would determine the serviceability of an ABS sensor in situ?
Connect a voltmeter across the sensor output pins reading should be 5 volts
Connect an ammeter across the sensor output pins reading should be 20 amps
Connect an oscilloscope across the sensor output pins and rotate the wheel
An ABS sensor cannot be tested in situ
A light vehicle fitted with Hydraulic power steering is exhibiting heavy steering. What is the most likely cause?
Worn swivel pin thrust pad causing stiff operation of the swivel pin
Flow control valve stuck closed causing fluid to return to the inlet side of the pump
High pressure control valve stuck closed preventing fluid leaving the pressure pump
Worn pressure pump rotors causing low output from high pressure pump
The electronic power-assisted steering warning light is constantly illuminated. Which of the following would be a suitable approach to diagnosing the fault?
Confirm that the light is on and connect a fault code reader to the system
Take the vehicle on a road test to check if the light goes out when cornering
Replace the motor, clean the connectors and check the light goes out
Turn the steering from lock to lock and check if the light goes out
How would the thrust angle usually be set on a light vehicle
By placing alignment gauges onto the front wheels and adjusting them to be parallel to the vehicle centre line
By placing alignment gauges onto the wheels on the same side of the vehicle and adjusting them to be parallel to the vehicle centre line
By placing alignment gauges onto the rear wheels and adjusting them to be parallel to the vehicle centre line
By placing alignment gauges onto the front wheels and adjusting them to be equal distances from the front of the vehicle
One symptom of the self levelling suspension not operating on a laden estate car could be
the hydraulic power assisted steering could become lighter than normal
the headlights could dazzle oncoming drivers when driving at night
the vehicle would tend to understeer when turning a corner
The engine management system would reduce the engine power
In the diagram of the ABS system. What is the function of the modulator?
To reduce the amount of pedal effort required by the driver
Storage of hydraulic pressure to maintain system pressure
To determine when ABS assistance is required
Controlling hydraulic pressure in the brake lines
The diagram shows a vehicle fitted with electronically controlled self levelling suspension. Increasing the length of point X will
decrease the suspension reaction time
increase the suspension reaction time
decrease the vehicle ride height
increase the vehicle ride height
When checking the maximum pressure of a rack and pinion hydraulic power assisted steering system you must ensure that
all steered axles are lifted off the ground
the steered wheels are placed on turn-tables
both steered wheels are prevented from turning
the passenger side wheel is prevented from turning
If the motor fails on an electric power-assisted steering system
the engine management system will reduce engine power
the driver must still be able to steer the vehicle
the steering will lock in the straight ahead position
the engine must shut down until the fault is repaired
The diagram represents a waveform from an inductive ABS wheel speed sensor. Which of the following would increase the ouptuvoltage?
decreasing the sensor input voltage
increasing the sensor input voltage
decreasing the sensor air gap
increasing the sensor air gap
A test on an ABS wheel speed sensor shows that it is open circuit. An acceptable repair would be to
replace both sensors on the same axle as they are supplied in pairs
replace the sensor and its wiring back to the nearest connector
Cut out the damaged section of wiring and splice in a new section
Replace the wiring from the nearest connector to the sensor, splicing it at the sensor
A problem is suspected with the internal wiring of an electronically controlled self levelling suspension modulator. The manufacturers information modulator coil should be 1.5 ohms. Which is the most suitable position to select on the multimeter?
Position B
Position D
Position C
Position A
When checking the resistance of hydraulic pump a light vehicle ABS modulator valve, it is essential that
the wiring harness is disconnected from the pump
the wiring harness is connected to the pump
the vehicle ignition is switched off
The brake pedal is not pressed
Which of the following diagnostic tools is best suited to measure the output from a light vehicle ABS speed sensor?
A dynamometer
an Ohmmeter
An oscilloscope
A DC voltmeter
A fault in a light vehicle Electronic Brake Force Distribution (EBD) system will often cause
the electronic handbrake to turn off
the engine to provide reduced power
the EDC system to shut down
the ABS system to shut-down
A fault with the yaw sensor fitted to a light vehicle will most likely cause
the Adaptive Ride Control warning light to illuminate
the Anti-lock Braking System warning light to illuminate
the Electronic Power Assisted Steering warning light to illuminate
The electronic diesel control warning light to illuminate
After replacing a levelling sensor on a vehicle fitted with a electronically controlled self levelling suspension system, the vehicle should be checked by
carrying out a road test over uneven ground
manually operating the suspension through its full range of travel
carrying out a road test with the vehicle fully loaded
bouncing on each corner of the vehicle in turn to check that it self levels
A light vehicle ABS exciter ring has been checked for run-out and the dial gauge has moved from 0 anti-clockwise to the position in the diagram. The manufacturer states that the maximum permitted run-out is 0.2mm. The exciter ring is
out of tolerance by 0.85mm
in tolerance by 0.07mm
in tolerance by 0.7mm
Out of tolerance by 0.1mm
When checking the condition of the track rod ends on the rear wheels of a four wheel steer vehicle it is necessary to
rock the steering back and forth with the wheels raised off the ground
rock the steering back and forth with the wheels on turntables
rock the steering back and forth whilst producing a false, high speed signal to the control ECU
rock the steering back and forth with the wheels on the ground or ramp
A four-wheel steer vehicle has feathered wear on both outer edges of the rear tyres. The rack and pinion is mounted in front of the rear axle. To correct the fault the technician will need to
decrease the amount of rear wheel positive caster
increase the length of the rear track rods
increase the amount of rear wheel positive caster
decrease the length of the rear track rods
The definition of the term Castor angle is defined as
the angle of the road wheel steering axis relative to the vertical, as viewed from above the vehicle
the angle of the road wheel steering axis relative to the vertical, as viewed from side the vehicle
the inclination of the road wheel relative to the vertical axis, when viewed from the side of the vehicle
the angle of the road wheel steering axis relative to the vertical, as viewed from the front of the vehicle
What type of trace would you expect to see on an oscilloscope when testing the output from a Hall effect sensor
A square wave
A cosine wave
A sine wave
A variable frequency
Which steering angle gives a self-centering action on a light vehicle?
Swivel pin inclination
Camber
Castor
Negative offset
One advantage of power-assisted steering over manual steering on a light vehicle is that it allows for
a low steering box ratio reducing the number of turns lock to lock
a high steering box ratio reducing the number of turns lock to lock
a high steering box ratio increasing the number of turns lock to lock
a low steering box ratio increasing the number of turns lock to lock
After replacing a chassis levelling sensor on an electronically controlled self levelling suspension vehicle, what else must be done before the vehicle is driven on a main road
The maximum chassis raised height should be set
The air bag pressure should be set
The minimum chassis lowered height should be set
The chassis ride height should be calibrated
A four-wheel steer light vehicle is presented for repair with the off side rear tyre wearing smooth on the outer shoulder. What is the possible cause
Incorrect front wheel toe-in
Incorrect rear wheel castor angle
Incorrect rear wheel camber angle
Incorrect rear wheel toe-in
If the pump should fail in a hydraulic power-assisted steering system
the mechanical steering system must still be able to operate
the engine will automatically go into reduced power mode
The engine immobiliser should prevent the vehicle being used until the fault is repaired
The steering lock should automatically engage to prevent the vehicle being used
An ABS control unit calculates that a wheel is about to lock by
sensing a sudden drop in D.C voltage from a wheel sensor
sensing a sudden drop in A.C. voltage from a wheel sensor
sensing a sudden drop in speed from the vehicle tachograph
sensing the deceleration force of the vehicle
Hydraulic power-assisted steering should be checked for wear and correct performance by
carrying out a road test with the vehicle fully loaded and using a variety of different roads
Jacking up the front of the vehicle and turning the wheels lock to lock with the engine switched off
Blocking the front wheels from turning and placing a pressure gauge in the pipe between the pump and the steering box
placing the steered axles onto turntables and turning the steering from lock to lock with the engine running
How do you measure current flow in a circuit?
the ammeter must be connected in parallel
the ohmmeter must be connected in series
the ohmmeter must be connected in parallel
the ammeter must be connected in series
The output voltage from an inductive wheel speed sensor can be measured using
a voltmeter set to 10-100 volts AC
a voltmeter set to 0-10 volts DC
a voltmeter set to 0-10volts AC
a voltmeter set to 10-100volts DC
Which one of the following statements regarding hydraulic brake systems is true and accurate
Pressure in a closed system is equal throughout
Hydraulic pressure is dependent on the output piston diameter
Pressure varies depending on the fluid compressibility
Hydraulic systems are inefficient
