ASE Prep - EBCS, ABS,
TCS, & ESC questions
and answers (graded
A+)
The wiring harness from the right front ABS wheel speed sensor to
the harness connector is badly damaged from corrosion, exposing
the wires. Technician A says to carefully clean the damaged section
and wrap the damaged area with black tape. Technician B says a
badly corroded harness should be replaced. Who is correct?
A only
B only
Both A and B
Neither A nor B - answerB only
A diagnostic trouble code (DTC) representing the L/R wheel speed
sensor is obtained in the ABS. This DTC may be caused by:
an open circuit at the R/R wheel signal sensor.
a grounded circuit on the L/R wheel sensor.
a larger tire than specified by the manufacturer on the R/F wheel.
an open circuit in the electronic brake control - answera grounded
circuit on the L/R wheel sensor.
When the vehicle is in motion, the wheel speed sensor of an antilock
brake system will:
send a varying AC voltage signal to the ABS controller.
, send a 5-volt supply signal to the ABS controller.
complete a circuit to ground when a fault occurs.
send a modified digital square wave signal to the ABS controller. -
answersend a varying AC voltage signal to the ABS controller.
An ABS hydraulic control unit (HCU) makes a clicking noise after the
vehicle is started. Technician A says that this indicates a faulty
control unit. Technician B says that this is the initial self-test of the
HCU and is normal. Who is correct?
A only
B only
Both A and B
Neither A nor B - answerB only
On ABS systems with a high-pressure accumulator, the accumulator
is depressurized by:
pumping the brake pedal 25 to 40 times with the ignition switch off.
pumping the brake pedal 10 times with the ignition switch on.
loosening the bleeder screw on the accumulator with the ignition
switch on.
loosening the front wheel bleeder screws with the ignition switch
on. - answerpumping the brake pedal 25 to 40 times with the
ignition switch off.
A vehicle with ABS is brought in due to a pedal pulsation. Technician
A says some pedal pulsation is normal during hard braking with
ABS. Technician B says the brake rotors may have excessive runout.
Who is correct?
A only
B only
Both A and B
Neither A nor B - answerBoth A and B
TCS, & ESC questions
and answers (graded
A+)
The wiring harness from the right front ABS wheel speed sensor to
the harness connector is badly damaged from corrosion, exposing
the wires. Technician A says to carefully clean the damaged section
and wrap the damaged area with black tape. Technician B says a
badly corroded harness should be replaced. Who is correct?
A only
B only
Both A and B
Neither A nor B - answerB only
A diagnostic trouble code (DTC) representing the L/R wheel speed
sensor is obtained in the ABS. This DTC may be caused by:
an open circuit at the R/R wheel signal sensor.
a grounded circuit on the L/R wheel sensor.
a larger tire than specified by the manufacturer on the R/F wheel.
an open circuit in the electronic brake control - answera grounded
circuit on the L/R wheel sensor.
When the vehicle is in motion, the wheel speed sensor of an antilock
brake system will:
send a varying AC voltage signal to the ABS controller.
, send a 5-volt supply signal to the ABS controller.
complete a circuit to ground when a fault occurs.
send a modified digital square wave signal to the ABS controller. -
answersend a varying AC voltage signal to the ABS controller.
An ABS hydraulic control unit (HCU) makes a clicking noise after the
vehicle is started. Technician A says that this indicates a faulty
control unit. Technician B says that this is the initial self-test of the
HCU and is normal. Who is correct?
A only
B only
Both A and B
Neither A nor B - answerB only
On ABS systems with a high-pressure accumulator, the accumulator
is depressurized by:
pumping the brake pedal 25 to 40 times with the ignition switch off.
pumping the brake pedal 10 times with the ignition switch on.
loosening the bleeder screw on the accumulator with the ignition
switch on.
loosening the front wheel bleeder screws with the ignition switch
on. - answerpumping the brake pedal 25 to 40 times with the
ignition switch off.
A vehicle with ABS is brought in due to a pedal pulsation. Technician
A says some pedal pulsation is normal during hard braking with
ABS. Technician B says the brake rotors may have excessive runout.
Who is correct?
A only
B only
Both A and B
Neither A nor B - answerBoth A and B
