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Honda Ridgeline. Manual - part 327

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Terminal

number

Wire

color

Terminal

sign

Description

Measurement (Disconnect the VSA

control unit 46P connector)

Terminal

Conditions

Voltage

19-45

WHT/

RED

FLP

Sends left-front
wheel speed

GRN

FRP

Sends right-front
wheel speed

WHT

CAN-H

F-CAN
communication
circuit

GRN/

WHT

IG1

Power source for
activating the system

GND

Ignition switch ON (II)

Battery
voltage

RED

RL-GND

Detect left-rear wheel
sensor signal

BLU/
WHT

Detect left-front
wheel sensor signal

BLK

GND2

Ground for the VSA
modulator-control
unit

GND

At all time

0.1 V or less

WHT/

RED

B SOL

Power source for the
valve relay

GND

At all time

Battery
voltage

WHT

B MOT

Power source for the
motor relay

GND

At all time

Battery
voltage

BLK

GND1

Ground for the pump
motor

GND

At all time

0.1 V or less

(cont’d)

＊０１

System Outline

19-46

VSA System Components

System Description (cont’d)

GAUGE CONTROL UNIT

YAW RATE-LATERAL
ACCELERATION
SENSOR

STEERING ANGLE
SENSOR

PCM

WHEEL SENSOR

VTM-4 CONTROL
UNIT

• VSA OFF switch signal
• Parking brake switch signal
• TPMS indicator signal

• Yaw rate signal
• Lateral acceleration signal

Steering angle signal

• Engine torque control request
• Shift control request
• Control mode signal

Indicators drive signal

• VSA control enable/disable
• Throttle open angle signal
• Engine revolution signal
• Gear position signal
• Brake pedal position switch signal
• Service check signal

Wheel rotation pulse signal

Wheel speed
signal

Tire low pressure
signal

CONTROL UNIT

MODULATOR UNIT

VSA MODULATOR-
CONTROL UNIT

Brake pressure
signal

• Solenoid control
• Motor control

Communication via F-CAN

VSA
OFF
SWITCH

PARKING
BRAKE
SWITCH

BRAKE
FLUID
LEVEL
SWITCH

BRAKE
PEDAL
POSITION
SWITCH

This system is composed of the VSA modulator-control unit, the wheel sensor, steering angle sensor, and yaw rate-
lateral acceleration sensor, and takes charge of the ABS, EBD, TCS, VSA, and brake assist control by controlling the
brake pressure of each wheel and the engine torque.

０３

０４

ABS Features

EBD Features

Grip force of tire and road surface

19-47

COEFFICIENT OF
FRICTION

TARGET SLIP RATE

ROTATIONAL
DIRECTION

RADIAL
DIRECTION
OF THE
ROTATIONAL
DIRECTION

SLIP RATE

REAR WHEEL BRAKE PRESSURE

With EBD under HEAVY LOAD
at REAR WHEEL

With EBD under LIGHT LOAD
at REAR WHEEL

Without EBD

FRONT WHEEL BRAKE PRESSURE

When the brake pedal is pressed while driving, the wheels sometimes lock before the vehicle comes to a stop. In such
an event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of the vehicle is
reduced if the rear wheels are locked, creating an extremely unstable condition. The ABS precisely controls the slip
rate of the wheels to ensure maximum grip force from the tires, and it thereby ensures maneuverability and stability
of the vehicle. The ABS calculates the slip rate of the wheels based on the four wheel speed, then it controls the brake
fluid pressure to reach the target slip rate.

The electronic brake distribution (EBD) helps control vehicle braking by adjusting the rear brake force in accordance
with rear wheel load before the ABS operates. Based on wheel sensor signals, the ABS control unit uses the
modulator to control the rear brakes individually. When the rear wheel speed is less than the front wheel speed, the
VSA modulator-control unit retains the current rear brake fluid pressure by closing the inlet valve in the modulator. As
the rear wheel speed increases and approaches the front wheel speed, the VSA modulator-control unit increases the
rear brake fluid pressure by momentarily opening the inlet valve. This whole process is repeated very rapidly. While
this is happening, there is kickback at the brake pedal.

(cont’d)

０５

TCS Features

19-48

VSA System Components

System Description (cont’d)

ANTI-POWER of BRAKE FORCE

TOTAL TRACTION

DRIVING POWER

TOTAL TRACTION

BRAKE FORCE

SLIPPERY ROAD SURFACE

NORMAL ROAD SURFACE

When a drive wheel loses traction on a slippery road surface and starts to spin, the VSA modulator-control unit applies
brake pressure to the spinning wheel and sends an engine torque control request to the PCM to slow the spinning
wheel and keep traction.

Content .. 325 326 327 328 ..