Acura RL (1996-2004 year). Manual - part 522

Wheel Speed and Modulator Control

SPEED

 

VEHICLE

 

SPEED

REFERENCE

 

VEHICLE

 

SPEED

PRESSURE

OUTLET
VALVE

INLET
VALVE

MOTOR

ON

OFF

WHEEL SPEED

TIME

When the wheel speed drops sharply below the vehicle speed, the inlet valve closes to retain the caliper fluid pressure.
When the wheel speed drops further, the outlet valve opens momentarily to reduce the caliper fluid pressure. The pump

motor starts at this time.

As the wheel speed is restored, the inlet valve opens momentarily to increase the caliper fluid pressure.

Wheel Sensor

The wheel sensors are the magnetic contactless type. As the gear pulser teeth rotate past the wheel sensor's magnetic
coil, AC current is generated. The AC frequency changes in accordance with the wheel speed. The ABS control unit detects
the wheel sensor signal frequency and thereby detects the wheel speed.

GEAR PULSER

WHEEL SENSOR

at HIGH SPEED

at LOW SPEED

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Table of Contents

ABS Control Unit Terminal Arrangement

ABS CONTROL UNIT 22P CONNECTOR

Wire side of female terminals

Terminal

number

1

3

4

5

6

7

8

9

10

11

Wire

color

BLK

WHT/RED*

GRN/RED

WHT/GRN*

BRN

GRN/BLU

GRN

GRN/BLK

GRN/WHT

YEL/BLK

Terminal sign

(Terminal

name)

GND3

(Ground 3)

FLP

(Front-left
pulse)

PARK

(Parking)

FRP

(Front-right
pulse)

FLW (-)

(Front-left

wheel negative)

FLW (+)

(Front-left

wheel positive)

FRW (-)

(Front-right

wheel negative)

FRW (+)

(Front-right
wheel positive)

STOP

IG2

(Ignition 2)

Description

Ground

Outputs left-front wheel
sensor signal

Detects parking brake

switch signal

Outputs right-front wheel
sensor signal

Detects left-front wheel
sensor signal

Detects right-front wheel
sensor signal

Detects brake pedal posi-

tion switch signal

Power source for activating

the system

Measurement

Terminal

1-GND

3-GND

4-GND

5-GND

6-7

8-9

10-GND

11-GND

Conditions

(Ignition switch ON (ID)

Spin wheel slowly

Parking brake Pressed

pedal Released

Spin wheel slowly

Spin wheel at

1 turn/second

Stopped

Brake Pressed

pedal Released

Ignition ON (II)

switch Start (III)

Voltage

Below 0.3 V

5 V  0 V

Below 0.3 V

Battery Voltage

5 V  0 V

AC:

0.053 V or
above

(Reference)
Oscilloscope:
0.15Vp-p or
above

0.25-1. 15V

Battery Voltage

Below 0.3 V

Battery Voltage

Below 0.3 V

*: With TCS only

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Table of Contents

Terminal

number

12

13

14

15

16

17

18

19

20

21

22

Wire
color

BLK

GRY/WHT*

RED

GRY/BLK*

GRN

LT BLU

GRY

GRN/YEL

BLU/YEL

YEL/GRN

RED

Terminal sign

(Terminal name)

GND4

(Ground 4)

RLP

(Rear-left
pulse)

SCS

(Service check
signal)

RRP

(Rear-right
pulse)

MCK

(Motor check)

RLW (+)

(Rear-left
wheel positive)

RLW (-)

(Rear-left
wheel negative)

RRW (+)

(Rear-right

wheel positive)

RRW (-)

(Rear-right

wheel negative)

FSR

(Fail-safe
relay)

DLC

(Data link
connector)

Description

Ground

Outputs left-rear wheel
sensor signal

Detects service check con-
nector signal (DTC indica-

tion or DTC erasure)

Outputs right-rear wheel
sensor signal

Detects pump motor drive
signal

Detects left-rear wheel

sensor signal

Detects right-rear wheel
sensor signal

Drives fail-safe relay
(Fail-safe relay is turned
OFF to shut off the power
source to the solenoid and
pump motor relay when
problem occurs.)

Communicates with the

Honda PGM Tester

Measurement

Terminal

12-GND

13-GND

14-GND

15-GND

16-GND

17-18

19-20

21-GND

22-GND

Conditions

(Ignition switch ON (ID)

Spin wheel slowly

SCS service Connected

connector

 

Disconnected

Turn wheel slowly

ON

Pump motor —————

OFF

Remove MCK fuse

Turn wheel at

1 turn/second

Stopped

Warning

Normal

Voltage

Below 0.3 V

5 V  0 V

Below 0.3 V

About 5 V

5 V  0 V

Battery Voltage

Below 0.3 V

About 10 V

AC:

0.053 V or
above

(Reference)
Oscilloscope:

0.15 Vp-p or

above

0.25 -1.15V

Below 0.3 V

About 1 1 V

*: With TCS only

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Table of Contents

ABS Control Unit Terminal Arrangement

ABS CONTROL UNIT 12P CONNECTOR

Wire side of female terminals

Terminal

number

1

2

3

4

5

6

7

8

9

10

11

12

Wire

color

BLU/WHT

BLK

BLK/ORN

YEL/BLU

YEL/WHT

YEL/BLK

BLK

YEL

RED/BLU

RED/WHT

RED/BLK

YEL/RED

Terminal sign

(Terminal name)

WALP

(Warning lamp)

GND1

(Ground 1)

RR-OUT

(Rear-right
outlet)

FL-OUT

(Front-left
outlet)

RL-OUT

(Rear-left
outlet)

FR-OUT

(Front-right
outlet)

GND2

(Ground 2)

RR-IN

(Rear-right
inlet)

FL-IN

(Front-left
inlet)

RL-IN

(Rear-left
inlet)

FR-IN

(Front-right
inlet)

PMR

(Pump motor
relay)

Description

Drives ABS indicator
(Turns the indicator drive

transistor to ON, then turns

off the indicator)

Ground

Drives right-rear outlet
solenoid valve

Drives left-front outlet

solenoid valve

Drives left-rear outlet

solenoid valve

Drives right-front outlet
solenoid valve

Ground

Drives right-rear inlet
solenoid valve

Drives left-front inlet

solenoid valve

Drives left-rear inlet

solenoid valve

Drives right-front inlet

solenoid valve

Drives pump motor relay

Measurement

Terminal

1-GND

2-GND

3-GND

4-GND

5-GND

6-GND

7-GND

8-GND

9-GND

10-GND

11-GND

12-GND

Conditions

(Ignition switch ON (ID)

ABS indicator

ON

OFF

OFF

ON

OFF

ON

OFF

ON

OFF

ON

Voltage

4 - 6 V

Below 0.3 V

Below 0.3 V

Battery Voltage

Below 0.3 V

Below 0.3 V

Battery Voltage

Below 0.3 V

Below 1.0V

Battery Voltage

Below 0.3 V

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