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WorksheetsLV08 Chassis A
Total questions: 34
Worksheet time: 17mins
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
When the ABS system begins to operate the first pressure phase is called the:
Pressure release
Pressure Build
Holding hands
Holding Phase
The acronym ABS stands for:
Anti Bake System
Anti Lock Brake System
All Brakes Skid
Anti build System
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
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
A spongy brake pedal will be caused by:
Water in the system
Air in the hydraulic brake system
Boiling fluid
No ability to shed heat
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
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
The metal strip identified as X on the brake pad is the:
Brake pad wear indicator.
Retaining clip
Circlip pin
Retain indicator
With regards to light vehicle, the camber angle is:
The inclination of the road wheel relative to the vertical axis, when viewed from the front of the vehicle
The Axis of the road pin relative to the vertical point , when viewed from the front of the vehicle
The KPI
The SAI
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
A test on an ABS Sensor shows that it is open circuit. An acceptable repair would be to:
Replace the sensor and its wiring back to the nearest connector
Get a second-hand one
Crimp new terminals on it
solder it
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.
A fault with the yaw sensor fitted to a light vehicle will most likely cause:
Brake imbalance
The Vehicle to lower
Wheel spin
The Adaptive Ride Control warning light to illuminate.
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
Electronic Brake force Distribution (EBD) when applied to a light vehicle:
Controls the braking force at the wheels by monitoring slip ratio of the tyres.
Controls the braking force at the wheels by monitoring the condition of the road surface
Controls the braking force at the wheels by measuring the load applied to the front and rear axles
Controls the braking force at the rear wheels by reducing the brake force when the vehicle is un-laden
In an ABS system, What is the function of the modulator?
Controlling hydraulic pressure in the brake lines
Control the brake pads
PWM programming
REads speed semnnsor outputs
When measuring the current consumption of an ABS electro-pneumatic solenoid.
It is important that:[equipment used and connection]
The ammeter must be connected in series
The ammeter must be connected in Parallel
The volt meter must be connected in series
The volt meter must be connected in Parallel
Which steering angle gives a self centering action on a light vehicle?
Castor angle.
Camber angle
Akerman angle
awkward angle
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
During hard braking an insecure load in the boot of a light vehicle will slide forwards due to
Inertia force
Centripetal force
Center of gravity
Rockets
The Electronic Power Assisted Steering warning light is constantly illuminated.
What would be the suitable approach to diagnose the fault?
Wiggle the steering
Talk to the customer
Confirm that the light is on and connect a fault code reader.
Check battery voltage
Explain Steering Axis Inclination (KPI)
The steering axis inclination is the vertical axis of the ball joints, king pins or MacPherson strut tube.
It is always an inward tilt
The rake angle of the steering plane
This helps cornering
The horizontal axis of the wishbones and the movement through a curved plane.
An inductive type sensor signals wheel speed to the ABS control unit by:
Being supplied a DC voltage that is then switched
using PWM
Producing an AC voltage which varies in frequency with wheel speed.
using EMF
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
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
When cornering, a vehicle with electronically controlled air suspension will:
Provide more air pressure to the air springs on the outside of the bend after short delay
Immediately provide more air pressure to the air springs on the inside of the bend
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 inside of the bend after a short delay
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
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
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
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
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
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
