Automotive Systems Chapter 5
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Questions and Answers

The _____________ _______ ____________ uses the ECBM and the vacuum power booster to increase braking force.

brake assist system

The ________ ______________ is on when a fault is detected in the system.

ABS indicator

The Bosch 8.0 uses the _______ __________ _________ as the communication and monitoring system.

electronic brake control module

Traction control systems work best in deep snow and mud.

<p>False</p> Signup and view all the answers

What helps maintain vehicle contact with the road during understeer or oversteer conditions?

<p>vehicle stability enhancement</p> Signup and view all the answers

What disables the system on driver command for driving in deep snow or mud?

<p>traction control switch</p> Signup and view all the answers

What is an icon on the dashboard that stays illuminated when a fault is present?

<p>ABS indicator</p> Signup and view all the answers

Provides greater vacuum to the power booster to increase braking force.

<p>brake assist system</p> Signup and view all the answers

What applies power to the ABS pump and relays when the ignition is engaged?

<p>power up self test</p> Signup and view all the answers

What monitors the brake system by receiving and sending information from and to related components and systems?

<p>electronic brake control module</p> Signup and view all the answers

The electronic brake control module is considered the brain of the system.

<p>True</p> Signup and view all the answers

The power-up self-test occurs once the vehicle is shifted into drive or reverse.

<p>False</p> Signup and view all the answers

The Bosch 8.0 system integrates ABS, stability and traction control, and brake assist.

<p>True</p> Signup and view all the answers

The Bosch 8.0 system provides dynamic rear brake proportioning.

<p>True</p> Signup and view all the answers

The brake modulator valve cuts off hydraulic pressure to the wheels for the duration of an ABS event.

<p>False</p> Signup and view all the answers

The motor turns on and off when it receives direction from the EBCM.

<p>True</p> Signup and view all the answers

Inlet valves remain open during normal operating conditions.

<p>True</p> Signup and view all the answers

(BPMV) first stage of operation.

<p>isolation</p> Signup and view all the answers

What does BPMV stand for?

<p>Brake pressure modulator valve</p> Signup and view all the answers

(BPMV stage) directs pressure to accumulators.

<p>dump</p> Signup and view all the answers

(BPMV stage) allows pressure to flow to hydraulic circuit.

<p>reapply</p> Signup and view all the answers

(BPMV stage) maintains pressure existing in hydraulic circuit.

<p>isolation</p> Signup and view all the answers

(BPMV stage) opens outlet valve.

<p>dump</p> Signup and view all the answers

(BPMV stage) opens inlet valve.

<p>reapply</p> Signup and view all the answers

Which valves in the brake pressure modulator valve are only used with the traction control system?

<p>isolation</p> Signup and view all the answers

What component sends the command to the pump motor to turn on and off to create hydraulic pressure?

<p>electronic brake control module</p> Signup and view all the answers

Which component of the brake pressure modulator valve stores pressurized hydraulic fluid?

<p>accumulator</p> Signup and view all the answers

Type of ABS channel that controls braking on rear wheels and has the wheel speed sensor on the transmission of differential. Called RWAL by GM and RABS by Ford.

<p>one channel ABS system</p> Signup and view all the answers

What are the types of ABS?

<p>All of the above</p> Signup and view all the answers

Which wheels would a one channel ABS braking apply?

<p>rear wheels</p> Signup and view all the answers

Front wheel drive and rear wheel drive might have a _________ channel ABS system.

<p>three</p> Signup and view all the answers

How would a three channel brake system determine how to distribute brake fluid pressure?

<p>The control module selects the lowest wheel speed.</p> Signup and view all the answers

Where does input from various vehicle sensors such as the wheel speed sensor go?

<p>electronic control module</p> Signup and view all the answers

How many wheel speed sensors does a front wheel drive vehicle have with a three channel ABS system?

<p>four</p> Signup and view all the answers

A fully independent suspension system would be installed on a vehicle with which type of ABS channel system?

<p>four-channel ABS</p> Signup and view all the answers

The function of an ABS system is to _______.

<p>prevent wheel lock-up</p> Signup and view all the answers

In an ABS system, the _______ rapidly open and close hydraulic valves.

<p>solenoids</p> Signup and view all the answers

On rear-wheel drive vehicles with a ________ system, the front wheels do not require speed sensors.

<p>one-channel ABS</p> Signup and view all the answers

On a front wheel drive vehicle, the control module of a ________ handles front wheels separately and the rear wheels as a pair.

<p>three-channel ABS</p> Signup and view all the answers

The control module of a ________ handles all four wheels separately.

<p>four-channel ABS</p> Signup and view all the answers

The lateral vehicle sway on turns is measured by the _______.

<p>yaw sensor</p> Signup and view all the answers

The ________ may be called EBCM or CAB.

<p>control module</p> Signup and view all the answers

What are the things that go on each side of the valve block? They send pressure to the pair of wheels associated with its side of the pump.

<p>plunger pumps</p> Signup and view all the answers

What part of the braking system is attached to a circuit board and houses many solenoids?

<p>solenoid block</p> Signup and view all the answers

Which sensor monitors pressure in the accumulator? In this, the EBCM will signal the pump to restore pressure.

<p>pump pressure switch</p> Signup and view all the answers

How does the low pressure and high pressure accumulator work?

<p>The high pressure uses a nitrogen charge, and the low pressure one contains a sealed piston.</p> Signup and view all the answers

What tells the pump to turn on?

<p>the pressure sensor tells the EBCM to turn it on so it can stabilize pressure</p> Signup and view all the answers

What provides hydraulic pressure to one side of the vehicle or the other?

<p>plunger pump</p> Signup and view all the answers

What provides the electromagnetic signal to engage each of the valves individually in this assembly?

<p>solenoid block</p> Signup and view all the answers

What provides the mechanical force to create hydraulic pressure?

<p>pump motor</p> Signup and view all the answers

Accumulator high pressure is around 2700 psi.

<p>True</p> Signup and view all the answers

The EBCM only communicates with vehicle sensors for its inputs.

<p>False</p> Signup and view all the answers

Accumulators store vacuum.

<p>False</p> Signup and view all the answers

VSES and TCS use only the inlet and outlet valves in a 4-channel ABS.

<p>False</p> Signup and view all the answers

In a low pressure system, the DC motor turns a shaft with an eccentric cam that forces pistons to pump fluid.

<p>True</p> Signup and view all the answers

A 3-channel ABS combines the two rear wheels under one valve set control.

<p>True</p> Signup and view all the answers

The pressure sensor continuously reads ________ ___________ ___________ pressure.

<p>high pressure accumulator</p> Signup and view all the answers

The ABS pump creates hydraulic pressure __________.

<p>without driver control</p> Signup and view all the answers

Which valves in the valve solenoid block are usually open and which ones are usually closed?

<p>The outlet and supply valves are usually closed until acted upon, and the inlet and isolation valves are usually open.</p> Signup and view all the answers

What does the number of inlet valves depend on?

<p>The type of ABS system</p> Signup and view all the answers

What do the inlet valves do?

<p>Fluid flows from the master cylinder to the inlet valves then to the brakes. This valve controls pressure to specific wheels.</p> Signup and view all the answers

What does the number of outlet valves depend on?

<p>The type of ABS system</p> Signup and view all the answers

What do the outlet valves do?

<p>Bleeds pressure from specific wheels when open so it equalizes the system.</p> Signup and view all the answers

When would you find supply valves and what would the number of supply valves depend on?

<p>Supply valves exist for TCS and VSES features. The number of valves depends on the number of driven wheels.</p> Signup and view all the answers

Why do isolation valves exist? What does the number of valves depend on?

<p>Isolation valves exist for TCS and VSES. The number of valves depends on the number of driven wheels.</p> Signup and view all the answers

Solenoids operate using what type of force?

<p>electromagnetic</p> Signup and view all the answers

When would you find a dual stage solenoid valve and what is that?

<p>You'd find that on an older model car that's rear wheel drive ABS vehicles. It is a single solenoid that controls both isolation and dump valves.</p> Signup and view all the answers

What is the dump valve?

<p>The valve that the fluid flows through to get to the brakes.</p> Signup and view all the answers

What combines an isolation and a dump valve?

<p>dual stage solenoid valve</p> Signup and view all the answers

In this valve, you could have isolation, dump and reapply stages.

<p>A dual stage solenoid valve</p> Signup and view all the answers

Contains one supply valve for each driven wheel.

<p>isolation</p> Signup and view all the answers

Contains one inlet and outlet valve for each driven wheel.

<p>4-channel ABS</p> Signup and view all the answers

Uses one solenoid to control both the isolation and dump valve.

<p>dual-stage solenoid valve</p> Signup and view all the answers

Provides the electromagnetic charge to move a valve.

<p>electromagnetic device</p> Signup and view all the answers

Stage of operation that cuts off the pressure to the wheel brake.

<p>reapply</p> Signup and view all the answers

Allows the pressure from the wheel brake to dissipate back to the accumulator.

<p>traction control system</p> Signup and view all the answers

Returns valves to normal position, allowing hydraulic pressure to flow freely throughout the system.

<p>dump</p> Signup and view all the answers

The solenoid valve block is part of the ______.

<p>EBCM</p> Signup and view all the answers

Dual-stage solenoid valves are typically found on ______-wheel drive vehicles.

<p>rear</p> Signup and view all the answers

In a non-integral system, where does pressure come from to get to the accumulators?

<p>the outlet valve will open</p> Signup and view all the answers

Where does residual hydraulic pressure go when it is released from the wheel brake in a non-integral system?

<p>low pressure accumulator</p> Signup and view all the answers

What is the eccentric cam?

<p>It creates the hydraulic pressure for the ABS system. It's in between two pistons in the booster pump.</p> Signup and view all the answers

What rotates, causing the pump elements to move in and out?

<p>eccentric pump</p> Signup and view all the answers

What converts mechanical force to hydraulic pressure?

<p>booster pump</p> Signup and view all the answers

Which technician is correct? Technician A says that the booster pump and accumulator take the place of a power booster in an integral system. Technician B says that a non-integral system can reach pressures of up to 2700 psi.

<p>Technician B</p> Signup and view all the answers

What is constantly monitoring the wheel speed sensor to detect problems or slippage?

<p>EBCM</p> Signup and view all the answers

Where would varying electrical voltage come from that would not allow the ABS system to work?

<p>The EBCM talks to the PCM because it needs to know that the car is running so the ABS will be active.</p> Signup and view all the answers

What is monitoring the pump that is holding pressure inside the accumulator?

<p>EBCM</p> Signup and view all the answers

What is going to monitor proper relay function and also reports its findings to other modules?

<p>EBCM</p> Signup and view all the answers

The EBCM is going to communicate with the ___ and the ___ to initialize and monitor ABS, TCS (traction) and VSES (stability).

<p>PCM and TCM (transmission control module)</p> Signup and view all the answers

How is solenoid open or closed?

<p>The EBCM figures out what needs to be opened or closed and then sends an electrical current to the coil which engages the solenoid.</p> Signup and view all the answers

During a TCS (traction control) event, the EBCM will talk to the PCM why?

<p>The EBCM will tell the PCM to retard the engine timing and reduce fuel injector pulse width.</p> Signup and view all the answers

Why would the EBCM signal the relay (relay switch) to close?

<p>So it can provide power to the rest of the ABS, motor and solenoid valves.</p> Signup and view all the answers

For a non-integral system, it would turn the pump on to make sure that enough fluid is pumped back into the master cylinder. For an integral system, it would turn on the pump to ensure proper pressure in the accumulator.

<p>Why would the EBCM tell the pump to turn on?</p> Signup and view all the answers

The _________ _________ pump runs continuously when the ABS is functioning.

<p>keep alive</p> Signup and view all the answers

Which technician is correct? Technician A says that the PCM provides the direction to all of the ABS outputs. Technician B says on modern vehicles the EBCM communicates with other modules and provides diagnostic information to the scan tool.

<p>Technician B</p> Signup and view all the answers

The brake fluid sensor belongs in which category? Input or output info?

<p>input</p> Signup and view all the answers

The engine crank sensor belongs in which category? Input or output?

<p>input</p> Signup and view all the answers

The ABS warning light belongs in which category? Input or output?

<p>output</p> Signup and view all the answers

Study Notes

Brake Systems Overview

  • Brake Assist System: Utilizes the Electronic Control Brake Module (ECBM) and vacuum power booster to enhance braking force.
  • ABS Indicator: Illuminates on the dashboard when there is a fault detected in the ABS system.
  • Electronic Brake Control Module (EBCM): Central communication hub in Bosch 8.0 ABS systems, monitoring brake system components and functionality.
  • Traction Control System (TCS): Functions less effectively in deep snow and mud, contrary to common belief.
  • Vehicle Stability Enhancement System (VSES): Maintains vehicle contact with the road under conditions of understeer or oversteer.

ABS Functionality and Components

  • Power-Up Self Test: Engages ABS pump and relays upon ignition, ensuring system readiness.
  • Brake Pressure Modulator Valve (BPMV): Manages hydraulic pressure during ABS events with stages including isolation, dump, and reapply.
  • Accumulator: Stores pressurized hydraulic fluid in the braking system, with high-pressure accumulator readings around 2700 psi.

Types of ABS Systems

  • One Channel ABS: Controls braking on rear wheels, utilizing wheel speed sensor on the transmission/differential (known as RWAL by GM, RABS by Ford).
  • Three Channel ABS: Common in front-wheel and rear-wheel drive vehicles, distributes brake fluid pressure based on the lowest wheel speed.
  • Four Channel ABS: Features independent control of each wheel, often found in fully independent suspension systems.

Valve Operation and Structure

  • Solenoids: Rapidly open and close hydraulic valves, crucial for ABS operations; electromagnetically operated.
  • Inlet and Outlet Valves: Typically found in the valve assembly; inlet opens during fluid intake to brakes while outlet bleeds pressure from specific wheels.
  • Dual-Stage Solenoid Valve: Integrates isolation and dump functions within a single solenoid, often used in rear-wheel drive ABS systems.

EBCM and System Communication

  • EBCM: Acts as the brain of the ABS, monitoring wheel speed sensors for slippage and communicating with the Powertrain Control Module (PCM) and Transmission Control Module (TCM) for system coordination.
  • Relay Switch: Used by the EBCM to turn the pump on or off, maintaining proper hydraulic pressure in various system configurations.

Important Notes on Operation

  • Prevent Wheel Lock-Up: Key function of ABS systems, ensuring continuous traction during braking.
  • Pressure Management: EBCM regulates hydraulic pressure, with the pump creating this pressure without direct driver input.
  • Keep Alive Pump: Operates continuously during ABS functionality, assisting in maintaining hydraulic pressure.

Diagnostic and Control Functions

  • Diagnostic Communication: EBCM provides crucial diagnostic information to scan tools, enhancing vehicle maintenance and troubleshooting.
  • Input/Output Categories: Brake fluid and engine crank sensors are classified as input components, while the ABS warning light serves as an output indicator.

These notes encompass the critical aspects of braking systems, particularly focusing on ABS functionality, components, and operations for effective understanding and application.

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Test your knowledge on key terms from Automotive Systems Chapter 5. This quiz features flashcards that define crucial concepts such as brake assist systems and the electronic brake control module. Perfect for students looking to reinforce their understanding of automotive technology.

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