Automotive Control Systems Quiz

Describe traction control system operation.

Describe electronic stability control system operation.

ABS (antilock braking system), TCS (traction control system), and ESC (electronic stability control) are all subsystems of:

• PCS (powertrain control system).

• ERC (electronic ride control).

• EBC (electronic brake control).

• ASD (automatic shutdown).

Electronic stability control is designed to control:

• tire traction during acceleration.

• understeer and oversteer.

• limited slip differentials.

• the wheel speed sensor signal stability.

Maximum braking occurs when the wheels are rotating _________ slower than the vehicle speed.

• 0%–5%

• 10%–20%

• 85%–95%

• 100%

Which ABS system uses wheel speed sensors that require an outside power source to operate?

• A passive system

• An active system

• A dominant system

• A submissive system

Where does the hydraulic pressure for a traction control system originate?

• From a brake fluid pump and reservoir called the accumulator

• From the driver applying the brakes at the brake pedal

• From the centrifugal force of the brake rotors or drums

• From the pressure caused by heat when the fluid in the calipers and wheel cylinders expand

Technician A says that the ABS system rapidly cycles the brakes between hold, release, and apply during panic stops. Technician B says that first-generation ABS systems create braking pressure without driver input. Who is correct?

• Technician A

• Technician B

Technician A says that Hall effect wheel speed sensors create an analog AC signal that changes frequency with wheel speed. Technician B says that variable reluctance wheel speed sensors create a digital DC signal that changes amplitude with vehicle speed. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

Technician A says that in hold mode, the hold solenoid valve is open and fluid pressure builds to “hold” the brakes. Technician B says that in release mode, fluid pressure is released from the brake caliper and pumped back to the master cylinder. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B