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WorksheetsLV08 Chassis A
Total questions: 20
Worksheet time: 10mins
When checking the maximum pressure of a rack and pinion hydraulic power assisted steering system you must ensure that:
The steered wheels are placed on turn-tables
The tyres are the same diameter and correctly inflated
Eye protection is worn
Spill granules are at hand
What type of output signal do most inductive type sensors produced when tested with an oscilloscope?:
Square wave
Wobbly wave
A Sine Wave
Hello Wave
The following diagram shows the input values sent to an electric power steering ECU.
What type of signal is being received by the ECU?:
Pulse width Modulation (PWM)
Sine wave
Castle wave
Alter waveform
On braking, the ABS system goes into operation, it will go in to pressure holding phase first, the next phase it will go in to is called:
Rapid release
Counter balance
Pressure reduction phase
Phase build
The diagram shows the layout of a communication network from a light vehicle. This type of system is referred to as.
Busplex
Canplex
cineplex
A CAN BUS system
Multiplex
On a vehicle fitted with an EPAS system the component that senses the drivers turning effort is a:
Yaw angle sensor
Torque sensor
Vector sensor
Amplitude sensor
When the ABS system begins to operate the first pressure phase is called the:
Pressure release
Pressure Build
Holding hands
Holding Phase
An ABS warning light illuminates each time the vehicle goes around a left-hand corner. The fault code indicates an intermittent fault of an incompatible speed signal from the nearside from sensor. The fault is most likely to be:
excessive play in the front wheel bearing
Wrong airgap
Loose sensor connections
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 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 you notice that the rear tyre 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.
that the slip angles will vary and create an imbalance
Send confusing signals to the ABS ECU
Damage the suspension and bushes
When checking the electrical resistance of the hydraulic pump in a light vehicle ABS modulator valve it is essential that: [equipment used, connection method and safety]?
disconnected from the pump
Ohm-meter
Ohm-meter
The wiring harness is disconnected from the pump
using a logic probe
Which checks would determine the serviceability of an ABS sensor in situ?
Connect an oscilloscope across the sensor output pins and rotate the wheel
Use a multi-meter
With feeler gauges
connect a scanner and run live diagnostics
Excessive pulsating of the brake pedal when the brakes are applied could be caused by:
Excessive brake disc run-out
Drums out of round ,Loose brake drum
Loose wheel bearing
All options
A traction control system uses 2 methods to reduce engine torque in a wheel slip situation, name these two methods?
Yelling were all going to die
Pulling the handbrake
Throttle actuator pushes back the throttle linkage to help reduce wheel spin by reducing engine torque
[The ECU limits amount of fuel delivered via injectors]
-The ECU applies the brakes[ON-OFF] to limit wheel spin
Screaming and hoping for the best
The diagram represents a wave form from an inductive ABS speed sensor.
What would increase the output voltage?
Decreasing the air gap
increasing the air gap
Slowing the wheel
Driving faster
Non-progressive brake operation could be caused by a:
Faulty valve in the brake servo.
Leaking master cylinder
Air in the line
Wrong pad material
The diagram represents a wave form from an inductive ABS wheel sensor. As wheel speed increases the:
Voltage is stabilised
Voltage and the frequency increase with the wheel speed until it reaches approximately 10kph and than voltage becomes constant(0.25V) and frequency changes with speed.
The frequency will diminish and amplitude varies
Voltage rises exponentially in AC format
Which steering angle gives a self centering action on a light vehicle?
Castor angle.
Camber angle
Akerman angle
awkward angle
One advantage of a vehicle fitted with EPAS over a vehicle fitted with hydraulic power steering is:
Improved fuel economy
Worse fuel economy
better wear
improved handling
When checking the condition of the track rod ends on the rear wheels of a four wheel steer vehicle it is necessary to:
Use a pry bar to lift teh joint
wiggle the wheel
Inflate the tyres
Rock the steering wheel back and forth with the wheels on the ground or ramp.
The amount of assistance provided by an electric power assisted steering system is changed by:
Changing the current delivered to the motor in relation to the steering input shaft torque
Changing the voltage delivered to the motor in relation to the steering input shaft torque
Speed of wheel and twist
Torque input from a the inertia gimbal
