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WorksheetsLV08 IMI Advanced Chassis systems
Total questions: 52
Worksheet time: 32mins
One advantage of power assisted steering over manual steering on a light vehicle is:
A low steering box ratio increasing the number of turns
A low steering box ratio reducing the number of turns
A high steering box ratio increasing the number of turns
A high steering box ratio reducing the number of turns
When cornering, a vehicle with electronically controlled air suspension will:
Immediate pump air pressure to air springs on inside of bend
Pump air pressure to springs outside of bend after short delay
Pump air pressure to air springs inside bend after short delay
Immediately pump air pressure to springs on outside of bend
How would the thrust angle be set on a light vehicle?
Gauges on front wheels adjusting equal from front of vehicle
Gauges on same side adjusting parallel to centre line
Gauges on front wheels adjusting parallel to centre line
Gauges on rear wheels, adjusting parallel to centre line
A coil spring is subjected to three forces during normal operation. These forces are:
Tensile, compressive and shear
Compressive, tensile and torsional
Shear, bending and compressive
Compressive, shear and torsional
A test on an ABS wheel sensor shows open circuit. An acceptable repair would be to:
Replace wiring nearest connector sensor,splicing at sensor
Cut out damaged section of wiring and splice in new section
Replace the sensor and wiring back to the nearest connector
Replace both sensors on same axle as the supplied in pairs
An ABS control unit calculates that a wheel is about to lock up by:
Sensing the deceleration force of the vehicle
Sensing a sudden drop in speed from vehicle tachograph
Sensing a sudden drop in DC voltage from a wheel sensor
Sensing a sudden drop in AC voltage from a wheel sensor
The ABS light illuminates during left hand cornering. The fault code produced reads `intermittent incompatible speed signal NSF sensor`. What is the likely fault?
Poor connection NSF sensor when suspension extends
Unequal air gaps NSF and OSF sensor causing voltage to drop
Excessive play in front wheel bearing causing sensor to move
Poor connection NSF sensor each time suspension compresses
If the pump should fail in a hydraulic power assisted steering system:
The mechanical steering system must still operate
Steering lock will engage to prevent vehicle being used
Engine will automatically go into reduced power mode
Immobiliser will prevent vehicle being used until repair
When checking resistance in an ABS modulator valve ,it's essential that:
The brake pedal is not pressed
The wiring harness is connected to the pump
The wiring harness is disconnected from the pump
The vehicle ignition is switched off
Electronic brake force distribution (EBD) when applied to a light vehicle
Controls brake force at rear wheels when unladen
Controls brake force at wheels measuring load of axles
Controls brake force at wheels by slip ratio of tyres
Controls brake force at wheels through road surface temp
The diagram represents a wave form from inductive ABS sensor. As wheel speed increases the:
Voltage remains the same and frequency the same
Voltage remains same and frequency increases
Voltage increases and frequency remains same
Voltage increases and frequency increases
Which of the following checks would determine the serviceability of ABS sensor in situ?
Connect an oscilloscope across output pins spin the wheel
An ABS sensor cannot be checked in situ
Connect ammeter across output pins should be 20 amps
Connect a voltmeter across sensor output should be 5 volts
The diagram shows an electrically controlled self leveling suspension. Increasing length of X will :
Decrease the suspension reaction time
Increase the suspension reaction time
Increase the vehicle ride height
Decrease the vehicle ride height
After replacing levelling sensor on electronically controlled self levelling suspension you?
Carry out road test with vehicle fully loaded
Manually operate suspension through its full range of travel
Carry out a road test on uneven ground
Bounce on each corner of vehicle in turn to check self level
A faulty yaw sensor will most likely cause:
The adaptive ride control warning light to illuminate
The electronic diesel warning light to illuminate
The ABS warning light to illuminate
The electronic power steering warning light to illuminate
Below is a diagram of simple hydraulic circuit. Calculate the force at each of the actuator cylinders.
80N front, 106N rear
1600N across all cylinders
800N front, 600N rear
2000N front, 1500N rear
The amount of assistance provided by electric power steering is changed by:
Changing voltage to motor in relation steering shaft torque
Changing gear ratio between column and torque control unit
Changing gear ratio between column and rack
Changing current to motor in relation steering shaft torque
A 4WD vehicle has wear on the outer edges of the rear tyre. The rack & pinion steering gear is mounted at the front of rear axle. What need to happen to correct this wear problem?
Increase amount of rear wheel positive caster
Increase length of rear track rod ends
Decrease length of rear track rod ends
Decrease amount of rear wheel positive castor
A vehicle is fitted with EPAS. The system senses drivers turning effort by:
Steering speed sensor
Control pump
Flow control valve
Torque sensor
One symptom of self leveling suspension not operating on a laden estate car could be:
Headlights could dazzle oncoming drivers at night
Vehicle would under steer when cornering
Engine management would reduce engine power
Hydraulic power steering could become lighter than normal
The definition of the term castor angle is defined as:
Angle of road wheel steering axis viewed above vehicle
Inclination of road wheel to vertical axis side of vehicle
Inclination road wheel to vertical axis front of vehicle
Angle of road wheel steering axis viewed at side of vehicle
When discussing coefficient of friction it can be said that:
Coefficient of dynamic friction higher than static friction
Coefficient of static friction higher than dynamic friction
Coefficient of friction constant whether moving or static
Coefficient of static friction lower than dynamic friction
What type of trace would you expect to see on an oscilloscope when testing Hall effect sensor?
A cosines wave
A square wave
A variable frequency
A sine wave
When measuring current consumption of ABS solenoid it's important that:
The ohmmeter must be connected in parallel
The ammeter must be connected in series
The ohmmeter must be connected in series
The ammeter must be connected in parallel
One advantage of EPAS over hydraulic power steering Is:
Less steering effort
Reduced steering rack ratio
Improved fuel economy
No torque sensing required
The EPAS warning light on. Which is suitable approach to diagnosing the fault?
Turn steering wheel from lock to lock see if light goes out
Replace motor, clean connectors and check light goes out
Confirm light and plug in fault code reader
Take on road test and see if light goes out
The diagram shows the layout of a communication network. The system operates by:
Each control unit sends/receives data packets on databus
Each control unit sends/receives varying voltages on databus
Each control unit working independently from others
Each control unit sends/receives varying resistances databus
Which of the following diagnostic tools is best to measure output from ABS sensor?
An ohmmeter
An oscilloscope
A dynamometer
A DC voltmeter
During hard braking an insecure load in the boot will slide forwards due to
Gravitational force
Normal force
Centrifugal force
Inertia force
When checking track rod ends on the rear wheels of a four wheel steered car it's necessary to:
Rock steering back and forth with wheels off ground
Rock steering back and forth with wheels on turntables
Rock steering back and forth producing false signal to ECU
Rock steering back and forth with wheels on ground or ramp
The average slip tolerance from an ABS system is approximately:
0-5%
5-10%
10-30%
30-50%
If the car has larger slip angles at the rear than the the front it is said to be in
Oversteer
Understeer
Neutral steer
Positive steer
If the car has larger slip angles at the front than the the rear it is said to be in
Understeer
Oversteer
Neutral steer
Positive steer
As part of the MOT test, which THREE checks are carried out on a power steering system?
Static inspection, vehicle road test, play under load
Lock to lock check; play under load, hydraulic pump filter condition
Play under load, hydraulic system pressure, static inspection
Play under load, lock to lock check, static inspection
When checking an exciter ring it read this reading left from 0, if run out of 0.18mm is allowed
the ring is in spec by 0.07mm
the ring is in spec by 0.70mm
the ring is out of spec by 0.78mm
the ring is out of spec by 0.07mm
When checking maximum pressure of a hydraulic PAS rack and pinion system you must ensure that
the steered wheels are placed on turntables
the passenger wheel is prevented from turning
the steered wheels are lifted off the ground
both steered wheels are prevented from turning
The ABS modulator units function is to :
regulate pressure to front wheel under normal braking
control the fluid pressure to each wheel when ABS is working
regulate pressure to rear wheels under normal braking
Hold car still when parked
On an inductive wheel speed sensor one way to increase the output voltage would be to
Increase the sensor input voltage
increase the sensor air gap
Decrease the sensor air gap
decrease the sensor input voltage
During traction control operation the
brake is released on gripping wheel until traction found
brake is applied to the slipping wheel until traction found
brake is applied to gripping wheel until traction found
brake is released on slipping wheel until; traction found
A fault on an electronic brake force distribution system will cause
the engine to produce reduced power
the electronic gearbox to select neutral
the EDC system to shut down
the ABS to stop working
What state are the shift valves in when ABS is not in use?
Closed
Pulsating
Open
Half open to allow fluid through
During hard braking what is the proportioning valve restricting ?
Pressure to the front brakes
Pressure to all the brakes
Pressure to the rear brakes
Pressure in the master cylinder
When checking the output of an inductive ABS sensor with a multi meter, you would set it to.....
0-10 Amps
0-10v AC
0-10v DC
0-20 Ohms
For failsafe operation, the ABS solenoid valves are.....
held in the closed position
oscillate between open and closed
held in the open position
bypassed inside the modulator
When a wheel locks during the braking of a vehicle fitted with ABS, the modulator action will be:
Pressure realease, Pressure increase, Pressure Maintain
Pressure increase, Pressure Maintain, Pressure realease
Pressure maintain, pressure release, pressure increase
Pressure realease, pressure maintain, pressure increase
One cause of a vehicle having excessive front wheel tyre wear would be:
A worn steering column bush
steering torque sensor is inoperative
four wheel steering is fitted
Incorrect Steering Geometry
If a vehicle has under inflated front tyres it will have a tendency to:
understeer
neutral steer
wander
oversteer
With regards to light vehicles, the camber angle is defined as the....
angle of the wheel from the vertical axis viewed from above
angle of wheel relative to vertical axis viewed from side
inclination of the wheel to the vertical axis from the side
Inclination of wheel to the vertical viewed from the front
An advanced ride control system, when applied to a light vehicle......
Monitors the pitch of the vehicle & is over ridden by the throttle & brakes
Monitors the yaw of the vehicle & is over-ridden by the throttle and brakes
Monitors the yaw of the vehicle & over-rides the drivers throttle and brake
Monitors the pitch of the vehicle & over-rides the throttle & brake input.
Information sent to the active suspension system ECU is analysed in about
10 microseconds
10 milliseconds
1/10th of a second
1/100th of a seconds
A four wheel steer vehicle has a N/S/R worn tyre on the outer edge, the most likely cause would be........
Incorrect front wheel toe-in
Incorrect rear wheel camber
Incorrect rear wheel toe-in
Incorrect rear wheel caster angle
1 Hertz (Hz) equals.......
1 Metre per second
1 Joule per second
1 Cycle per second
1 v DC per second
