1996 ACURA RL KA9 Service Repair Manual

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Page 1153 of 1954

ACURA RL KA9 1996 Service Repair Manual
Anti-lock Brake System (ABS)

Features/Construction (cont'd)

ABS Control

The ABS control unit detects the wheel speed based on the wheel sensor signal it received, then it calculates the vehicl

Page 1154 of 1954

ACURA RL KA9 1996 Service Repair Manual
Self-diagnosis

1. The ABS control unit is equipped with a main CPU and a sub CPU, that check each other for problems.

2. The CPUs check the circuit of the system.

3. Self-diagnosis can be classifi

Self-diagnosis

1. The ABS control unit is equipped with a main CPU and a sub CPU, that check each other for problems.

2. The CPUs check the circuit of the system.

3. Self-diagnosis can be classified into 2 categories.

Initial diagnosis: Performed right after the engine starts and until the ABS indicator goes off.

Regular diagnosis: Performed right after the initial diagnosis until the ignition switch is turned OFF.

4. When a problem is detected by self-diagnosis, the system:

Turns the fail-safe relay OFF

Turns the solenoid valve OFF

Turns the pump motor OFF

Turns the ABS indicator ON

Self-diagnosis Table

Diagnostic Trouble

Code(DTC)

11, 13, 15, 17

12,14,16,18

21-24

31-38

41-44

51

52

53

54

61

62

71

81
Detection Item

Wheel sensor (open/short to body ground/short to power)

Wheel sensor (electrical noise/intermittent Interruption)

Pulser

Solenoid (short to body ground/short to wire)

Wheel lock

Motor lock

Motor stuck OFF

Motor stuck ON

Fall-safe relay

Low ignition voltage

High ignition voltage

Different diameter tire

Central Processing Unit (CPU) diagnosis, and ROM/RAM diagnosis
Detection

Timing
Initial
Diagnosis

O

O

O

O
Regular
Diagnosis
O

O

O

O

O

O

O

O

O

O

O

O
Fail-safe Mode

A

S, A and L, S and L

A and L

S

A and L

S and L

A and L

A and L

S

B

B

S

S

Operation Mode Table

Operation

Mode

Regular

operation

Fail-safe

mode-S

Fail-safe

mode-A

Fail-safe

mode-L

Fail-safe

mode-B
Description

Operation in normal condition

The ABS control unit turns the system off when the control unit detects a problem.

If the ABS control unit detects a malfunction during an emergency stop, it will turn off the malfunc-

tioning component, and continue to modulate the rest of the ABS system until the vehicle comes to

a stop. At that, the entire system will be turned off until the problem goes away.

The ABS control unit stores a DTC in back-up memory when it detects a problem. If a problem is

detected when the ignition switch is turned ON (II), the ABS control unit will turn the system off. If

the problem goes away, the ABS control unit will turn the system on again.

The ABS control unit will turn the system off if ignition voltage drops, and will turn on again when

ignition voltage returns to normal.
ABS
Indicator

OFF

Comes ON when a

problem is detected.

Comes ON when a

problem is detected.

ON

Comes ON when a

problem is detected.

On-board Diagnosis Function

The ABS control unit is connected to the 16P Data Link Connector.

The ABS can be diagnosed with the Honda PGM Tester.

The ALB Checker cannot be used with this system. For air bleeding, and checking wheel sensor signals, use the Honda

PGM Tester. See the Honda PGM Tester user's manuals for specific operating instructions.
ProCarManuals.com

Page 1155 of 1954

ACURA RL KA9 1996 Service Repair Manual Anti-lock Brak e Syste m (ABS )
Features/Constructio n (cont'd )
ABS Modulato r
Th e AB S modulato r consist s of the inle t solenoi d valve , outle t solenoi d valve , reservoir , pump , pum p m

Page 1156 of 1954

ACURA RL KA9 1996 Service Repair Manual Wheel Spee d an d Modulato r Contro l
SPEED VEHICL E SPEE D
REFERENC E VEHICL E SPEE D
PRESSUR E
OUTLETVALVE
INLETVALV E
MOTO R
ON
OF F
WHEE L SPEE D
TIM E
Whe n th e whee l spee d drop s sharpl y bel

Page 1157 of 1954

ACURA RL KA9 1996 Service Repair Manual ABS Contro l Uni t Termina l Arrangemen t
ABS CONTRO L UNI T 22 P CONNECTO R
Wir e sid e o f femal e terminal s
Terminal
number
1
3
4
5
6
7
8
9
10
1 1
Wir e
colo r
BLK
WHT/RED *
GRN/RED
WHT/GRN *
BRN

Page 1158 of 1954

ACURA RL KA9 1996 Service Repair Manual Terminal
number
12
13
1 4
15
16
17
1 8
19
2 0
2 1
2 2
Wir e
colo r
BLK
GRY/WHT *
RED
GRY/BLK *
GRN
LT BL U
GR Y
GRN/YE L
BLU/YEL
YEL/GR N
RED
Termina l sig n
(Termina l name )
GND4
(Groun d 4 )
RL P

Page 1159 of 1954

ACURA RL KA9 1996 Service Repair Manual ABS Contro l Uni t Termina l Arrangemen t
ABS CONTRO L UNI T 12 P CONNECTO R
Wir e sid e o f femal e terminal s
Terminal
number
1
2
3
4
5
6
7
8
9
10
1 1
12
Wir e
colo r
BLU/WH T
BLK
BLK/OR N
YEL/BLU
Y

Page 1160 of 1954

ACURA RL KA9 1996 Service Repair Manual
Troubleshooting Precautions

ABS Indicator

1. If the system is OK, the ABS indicator goes off 2 seconds after turning the ignition switch ON (II) without starting the

engine, and then comes on agai

Troubleshooting Precautions

ABS Indicator

1. If the system is OK, the ABS indicator goes off 2 seconds after turning the ignition switch ON (II) without starting the

engine, and then comes on again and goes off after 2 seconds. This occurs because the ABS control unit is turned on

by the IG2 power source.

2. The ABS indicator comes on when the ABS control unit detects a problem in the system. However, even though the

system is operating properly, the ABS indicator will come on, under the following conditions.

Only drive wheels rotate

One drive wheel is stuck

Vehicle spin

ABS continues to operate for a long time

Signal disturbance

To determine the actual cause of problem, question the customer about the problem, taking these conditions into con-

sideration.

3. When a problem is detected and the ABS indicator comes on, there are cases when the indicator stays on until the igni-

tion switch is turned OFF, and cases when the indicator goes off automatically when the system returns to normal. For

DTCs 61 and 62, the indicator goes off automatically when the system returns to normal. For all other codes, the indica-

tor stays on until the ignition switch is turned OFF.

4. For DTCs 12, 14, 16, 18, 21, 22, 23, 24, 51, 52 and 53, the indicator goes off when the vehicle is driven again and the sys-

tem is OK after the ignition switch is turned from OFF to ON (II). However, if the DTC is erased, the CPU is reset and the

indicator goes off right after the engine is started if the system is OK.

Diagnostic Trouble Code (DTC)

1. If the CPU cannot be activated and the indicator comes on, the DTC is not memorized.

2. The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the later one is

written over the old one. Therefore, when the same problem is detected repeatedly, it is memorized as 1 DTC.

3. The DTCs are indicated in the order of ascending number, not in the order they occur.

4. The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs cannot be canceled

by disconnecting the battery. Perform the specified procedures to erase the DTCs.

Self-diagnosis

1. Self-diagnosis can be classified into 2 categories.

• Initial diagnosis: Performed right after the engine starts and until the ABS indicator goes off.

• Regular diagnosis: Performed right after the initial diagnosis until the ignition switch is turned OFF.

2. When a problem is detected by self-diagnosis, the system.

Turns the fail-safe relay OFF

Turns the solenoid valve OFF

Turns the pump motor OFF

Turns the ABS indicator ONProCarManuals.com

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