Antilock Brake System

Symptom

Suspected area

See page

ABS and/or EBD does not operate

1. Check DTC again and make sure that normal system code displayed.

BC-25

2. IG power source circuit

BC-59

3. Front speed sensor circuit

BC-37

4. Skid control sensor circuit

BC-44

5. Check brake actuator using intelligent tester. (Check brake actuator operation using active test function.) If abnormal, check hydraulic circuit for leakage.

BC-34

6. If symptoms still occur even after above circuits in suspected areas inspected and proved to be normal, replace brake actuator (skid control ECU).

BC-89

ABS and/or EBD does not operate efficiently

1. Check DTC again and make sure that normal system code displayed.

BC-25

2. Front speed sensor circuit

BC-37

3. Skid control circuit

BC-44

4. Stop light switch circuit

BC-64

5. Check brake actuator using intelligent tester. (Check brake actuator operation using active test function.) If abnormal, check hydraulic circuit for leakage.

BC-34

6. If symptoms still occur even after above circuits in suspected areas inspected and proved to be normal, replace brake actuator (skid control ECU).

BC-89

Sensor signal check cannot be done

1. TS and CG terminal circuit

BC-84

2. Brake actuator (skid control ECU)

BC-89

DTC check cannot be done

1. Check DTC again and make sure that normal system code displayed.

BC-25

2. TC and CG terminal circuit

BC-81

3. If symptoms still occur even after above circuits in suspected areas inspected and proved to be normal, replace brake actuator (skid control ECU).

BC-89

ABS warning light remains on

1. ABS warning light circuit

BC-70

2. Brake actuator (skid control ECU)

BC-89

ABS warning light does not come on

1. ABS warning light circuit

BC-73

2. Brake actuator (skid control ECU)

BC-89

BRAKE warning light remains on

1. BRAKE waning light circuit

BC-74

2. Brake actuator (skid control ECU)

BC-89

BRAKE warning light does not come on

1. BRAKE warning light circuit

BC-79

2. Brake actuator (skid control ECU)

BC-89

TERMINALS OF ECU

1. Terminals of ECU

Symbols (Terminals No.)

Terminal Description

+BS (A15-1)

Solenoid valve power supply

GND1 (A15-2)

Skid control ECU ground

CANL (A15-5)

CAN communication line L

CANH (A15-6)

CAN communication line H

FL- (A15-8)

Front LH wheel speed signal input

FL+ (A15-9)

Front LH wheel speed sensor power supply

STP (A15-10)

Stop light switch input

RL+ (A15-11)

Rear LH wheel speed sensor power supply

RL- (A15-12)

Rear LH wheel speed signal input

+BM (A15-23)

Motor relay power supply

GND2 (A15-24)

Actuator pump motor ground

IG1 (A15-25)

ECU power supply

FR- (A15-30)

Front RH wheel speed signal input

FR+ (A15-31)

Front RH wheel speed sensor power supply

RR+ (A15-33)

Rear RH wheel speed sensor power supply

RR- (A15-34)

Rear RH wheel speed signal input

Main Body ECU (Rear View):

FTĂ–Ep^rlOT

7

6

5

4

3

2

1

22

21

2C

19

18

17

16

inr

2

1

6

5 4

7 6

5

3

1

1413

12 1

110

8

8

7

6

5

4

3

2

1

16

15

14

13

12

11

10

9

16

15

14

13

12

11

10

9

6

7

6

5

4

3

2

1

32

31

30

29

26

27

26

25

24

23

22

21

2C

1S

18

4F

3

2

y y

1

8

7

6 5

4

E114510E04

Symbols (Terminals No.)

Terminal Description

PKB (4C-2)

Parking brake switch input

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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