ATASA 5 ABS & Traction Control Systems · ABS & Traction Control Systems ... apply & release of...

ATASA 5 TH Study Guide Chapter 51 Pages: 1506 1534 Antilock Brake Systems 59 Points

ATASA 5 th ABS & Traction Control Systems Please Read The Summary

Before We Begin…

Keeping in mind the Career Cluster of Transportation , Distribution & Logistics

Ask yourself:

What careers might be present in this slide series?

What careers might interest me?

How do these careers relate to my other high school classes?

What career cluster is my 4year plan preparing me for?

ATASA 5 th ABS & Traction Control Systems

1. ABS systems use an __________________/______________ pumping of the brakes to control straightline stopping under panic conditions. (ABS is very fast, up top 15 x/second, & very precise)

Electronic/Hydraulic Mechanical/Chemical Electrical/Solar


2. Pressure ____________________ is the term used to describe the quick apply & release of brake system pressure by the antilock brake system. (preventing lockup leads to better maneuverability & stability)

Modulation Cavitation Electrification


3. ______ ______ is the difference between the actual speed of the vehicle and the speed of the tire’s tread as it rotates on the pavement. With ABS, the target slip rate is 10% to 30%

Slip Rate Clip Rate Ship Shape


4. It’s the traction of the _______ that actually stops the vehicle. ABS adjusts slip rate at each tire.


Wheels Tires Pads & Shoes

5. If the driver pumps the brakes while stopping, this prevents ABS from activating! True or False


6. When ABS is activated, a small ______ followed by rapid pedal __________ will continue until the vehicle either comes to a stop or the ABS turns off.

Grind, Vibration Bump, Pulsations Thump, Reverberation


7. There are both _____________ and _________________/_______________ components in each ABS system. These are also used for traction control system operation.


Hydraulic, Electrical/Electronic Pneumatic, Electrical/Electronic Polytechnic, Electrical/Electronic

8. The nitrogencharged ______________ is used to store the hydraulic fluid used to maintain high ABS pressure. It may also be used to store residual pressure for powerassisted braking.

Accumulator Defibrillator Modulator


9. The control valve assembly may be an _______________ part of the master cylinder assembly or may be mounted externally away from the master cylinder (nonintegral).

Extrinsic Integral Addon


10. The _____________ pump, an assembly of an electric motor & pump, provides pressurized fluid.

Booster Rooster Master Cylinder


11. The booster/ master cylinder assembly, sometimes referred to as the hydraulic __________ unit, contains the valves and pistons needed to modulate hydraulic pressure.

Control Retro Master


12. Fluid ____________________ are different than pressure accumulators. They are used to temporarily store brake fluid removed from the wheel brake units during an ABS cycle.


Accumulators Retractors Integrators

13.The ________ valve is a twoposition valve that is only open during the ABS mode.


Main Solenoid Actuator

14. The __________________ unit is made up of solenoid valves used to either, increase, decrease, or maintain hydraulic pressure to the individual wheel units. The valve block may also contain solenoids.

Accumulator Defibrillator Modulator


15. There are two solenoid valves known as wheel ___________ valves used to control each channel.

Circuit Circus Sirius


16. The ABS control module relies on input from the __________ speed sensors and feedback from the hydraulic unit to determine if ABS is operating properly or which mode of ABS is required.

Crankshaft Transmission Wheel


ABS is part of the High Speed CAN. There are also Medium Speed and Low Speed Controller Area Networks on the vehicle.


17. The brake __________ position sensor (BPP) determines pedal travel & signals the ECU that an ABS event is taking place. This along with wheel speed sensor input causes a system reaction.

Bracket Pedal Light


18. ABS systems have their own _______ for faults which are accessed through the OBDII DLC.

DTCs PIDs KIDs


19. The _________colored warning lamp illuminates during vehicle startup & ABS system self check as well as when a DTC (Diagnostic Trouble Code) is stored.

Red Amber Blue


20. A _____________ acceleration sensor is used on vehicles with ABS and stability control.

Radial Lateral Circular


21. A ______________ switch automatically controls the ground side of the pump relay energizing and deenergizing the pump to maintain proper accumulator pressure.

Pressure Solenoid Actuator


22. The ABS system has __________ that complete the high current circuits for the pump motor.

Relays Solenoids Breakers


23. The ___________ ring (reluctor or toner ring) of the wheel speed sensing device can be located on an axle shaft, differential gear, or a wheel hub.

Gear Toothed Fanged


24. The wheel speed sensor (coil & permanent magnet) & toner ring generate an ____ voltage signal.

AC DC MC


25. The electronic circuit & wiring of ABS is tied into the vehicle’s CAN ______________. This is a means of transferring information between computers on a serial data bus. (Multiplexing)


Network Channel Circuit

26. The ABS control unit operates _______________ / ______ valves in the hydraulic control unit that block off or isolate the master cylinder from certain brakes. These are corner specific valves.


Isolation/Dump Insulation/Bump Isolation/Pump

27. Manufacturers have unique ways of accomplishing ABS operation. _____________ systems with conventional powerassisted master cylinders & separate ABS hydraulic control units are typical.


Integral Nonintegral

28. ____________ is the name given to a hydraulic circuit to the brakes. (ABS can be 1,2,3, or 4 channel)


Channel Canal Actuator

29. Light trucks and some SUV’s use 1channel ABS on just the ________ brakes. (RWAL or RABS) Rear Wheel AntiLock Rear Antilock Brake System


Rear Right Left

30. A diagonally split system may us a ____channel system that modulates opposite corners.

2 3 4


31. A ____channel system will individually control each front brake but employ an RWAL system.

2 3 4


32. The most effective and most commonly available ABS is the ____channel system with a sensor for each wheel. Normal braking is done by a conventional vacuum powerassist system.


2 3 4

33. Based on input from wheel speed sensors, the ABS control module calculates the __________ rate of the wheels and then controls the brake fluid pressure to reach the target slip rate.

Slant Slip Tractive


34. __________ _________ sensors are variablereluctance sensors or permanent magnet generators.

Air Speed Wheel Speed Bad Seed


35. As wheel speed changes, sensor AC _____________ and _____________ change in accordance.

Frequency & Amplitude Attitude & Freakiness Altitude & Frequency


ATASA 5 th ABS & Traction Control Systems 36. Hydraulic control in the ABS modulator assembly has 3 modes of

operation: 1) Pressure REDUCTION, 2) Pressure RETAINING, 3) Pressure INTENISFYING. (dump, hold, build)

The ABS system is selfmonitoring. Every time the ignition switch is placed in the ON/RUN position, the control module will perform a preliminary selfcheck. The amber ABS light is illuminated during this test and will shut off if no problems are detected and no DTC’s are stored. (Lamp Fault Codes)


A system malfunction will cause the control module to shut off or inhibit the ABS system however, normal powerassisted braking remains.


37. Automatic __________ control (ATC) systems apply the brakes when a drive wheel attempts to spin and lose traction. The goal is still controlling wheel slip rate.

Treason Traction Technical


38. ______ controls negative wheel slip and ______ controls positive wheel spin.


ABS, ATC

39. The EBCM and the PCM will work together to reduce engine ____________ during traction control mode. This can be accomplished through retarding spark timing, closing the throttle, limiting injector pulse width, increasing EGR flow, and upshifting the transmission.


Torque Compression Horsepower

40. When ATC is actively controlling wheel spin, a __________ lamp is illuminated on the cluster.


*Green? Red Blue

41. Some traction control systems have a manual ____________ switch. The ambercolored traction control system lamp on the instrument cluster will then be illuminated.


Cutoff Backoff Slackoff

42. Electronic _________________ control (ESC) helps prevent skids, swerves, and rollovers.


Torque Stability Horsepower


43. ____________ is a condition where the vehicle is slow to respond to steering changes. (plow)


44. _______________ is a condition when the rear wheels try to swing around or fishtail. (loose)

45. ______ is defined as the natural tendency of a vehicle to rotate on its vertical axis.


46. _____ is the tendency of a vehicle to rotate on its horizontal axis.


Pitch Roll Yaw

47. A vibrationtype _____________ senses understeer & oversteer signaling the need to correct yaw.


Gyroscope

Vibratory Gyroscope an instrument for determining the angular velocity of an

object; contains vibrating parts that react to the object’s rotation. There are bar and rotor types of vibratory gyroscope. The sensing element in the bar type is formed by several vibrating objects similar to the bars of a

tuning fork.

48. ABS, ATC, and ECS Safety Precautions are listed on page _____.


1523 1524

49. An important thing to remember about ABS service is to relieve ________________ pressure BEFORE performing any hydraulic system service. 28,000 psi of pressure may be present!


Accumulator Decumulator Evaporator

50. A common method of depressurization is to ______ the pedal 25 times with the ignition key off.


Pump Stump Clump

51. All ABS systems have some sort of _______________,activated each time the ignition switch is turned on (KOEO).


SelfTest Written Test Blood Test

52. A solid (notflashing) ABS lamp indicates a __________ has been detected and ABS is inhibited although normal powerassisted braking is still present. A flashing lamp means repair ASAP!


Problem Situation Fault

53. ABS fault codes cannot be ____________ until all faults have been corrected and the vehicle has been driven for a manufacturer specified rate and distance.


Erased Repaired Cleared

54. Many of the components in an ABS system are serviced by ___________ only.


Rebuilding Reflashing Replacement

55. Brake ______________ is one area of service that will vary by manufacturer and system design.


Bleeding Adjusting Replacing

56. The auto brake system continues to evolve with things like ___________ calipers, brakebywire, electronic wedge brakes, rainsensing brakes that apply to selfdry and hill hold features.


Electric Hydraulic Pneumatic

In a drivebywire throttle control system, inlet air, fuel injection and ignition timing are also “backed off” during drive wheel slippage when ATC is energized. (manual cutoff of ATC is available)

Throttle Actuator Motor


It’s wise to disconnect vehicle computers before arc welding on any vehicles.


Scanners may also energize systems for bleeding.


ATASA 5 ABS & Traction Control Systems · ABS & Traction Control Systems ... apply & release of...

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