Daewoo Musso. Manual - part 238

4F-14  ANTILOCK BRAKE SYSTEM

Description

-

When measured by multi - meter (AC) :

output voltage > 70 mV

-

When measured in oscilloscope :

output voltage 

³

 120 mV/P-P

l

Replace the sensor.

l

Check wire for ground and open.

l

Check connection of the wheel speed sensor con-

nector and ECU side connector.

(Standard air gap : 0.15 - 1.20 mm)

l

Check output voltage of the sensor by rotating the

wheel 1/2 - 1 revolution per second and shaking sen-

sor wire.

-

When measured by multi - meter (AC) :

output voltage > 70 mV

-

When measured in oscilloscope :

output voltage 

³

 120 mV/P-P

l

Replace the sensor.

l

Check wire for ground and open.

l

Check connection of the wheel speed sensor con-

nector and ECU side connector.

l

Measure air gap between wheel teeth and wheel

speed sensor and check installation of wheel tooth.

(Standard air gap : 0.15 - 1.20 mm)

l

Check output voltage of the sensor by rotating the

wheel 1/2 - 1 revolution per second and shaking sen-

sor wire.

-

When measured by multi - meter (AC) :

output voltage > 70 mV

-

When measured in oscilloscope :

output voltage 

³

 120 mV/P-P

l

Replace the sensor.

l

Check number of teeth on the wheel rotor and its

condition.

-

Number of teeth : 52

l

Check valve relay voltage.

l

Check connection of connector and terminals in the

ECU and hydraulic modulator.

l

Check ground.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator.

Defect Code

09

10

11

12

Application

Rear/left Wheel Speed

Sensor (Signal)

Rear/right Wheel Speed

Sensor (Signal)

Wheel Rotor

Valve Relay

ANTILOCK BRAKE SYSTEM  4F-15

Description

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator.

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator.

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator.

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator.

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator.

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check terminals for open or short.

Application

Front / left INLET Valve

Front / left OUTLET Valve

Front / right INLET Valve

Front / right OUTLET Valve

Rear / left INLET Valve (ABD)

Rear / left OUTLET Valve

Rear / Right INLET Valve

Defect Code

13

14

15

16

17

18

19

4F-16  ANTILOCK BRAKE SYSTEM

Description

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator.

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator

l

Check solenoid internal resistance of the prime(ASV)

valve and pilot valve(USV) : 8.04 - 9.04 

W

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU and hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator

l

Check solenoid internal resistance of the prime(ASV)

valve and pilot valve(USV) : 8.04 - 9.04 

W

l

Check each valve by using SCANNER's solenoid valve

overriding function.

l

Check connection of connector and terminals in the

ECU and hydraulic modulator.

l

Check terminals for open or short.

(When connector is removed)

l

Replace the hydraulic modulator

l

Check each valve by using SCANNER's pump motor

overriding function.

l

Check resistance between pump motor ground ter-

minal and battery negative terminal : total resistance

should be less than 15 m

W

l

Check body ground location.

l

Check relay supply voltage : IGN on : 11 - 14 V

l

Relay coil internal resistance : 70 - 80 

W

l

Replace the hydraulic modulator

l

Check by using SCANNER's stop lamp switch diag-

nosing function from sensor value output function.

l

Check connection of ECU connector side stop lamp

switch terminal.

l

Check resistance of the stop lamp, switch.

-

Each end resistance value of the switch

Application

Rear / Right OUTLET Valve

Function and Response of The

Valve

Function and Response of The

Valve

Motor Relay / Circulation Pump

Stop Lamp Switch

Defect Code

20

21

22

24

27

ANTILOCK BRAKE SYSTEM  4F-17

Application

Power Voltage

Residual Temperature

Measurement (ABD only)

Acceleration Sensor Signal (wire)

Defect Code

28

29

42

Description

when switch knob (planger) is pressed by 3mm : 

¥

-

Each ends resistance value of the switch when

switch knob(plunger) is not pressed :

less than 200 m

W

l

When brake is applied :

ECU (ABS:No.14, ABD:No.48) terminal 11 - 14 V

or VBattery.

When brake is released :

ECU (ABS:No.14, ABD:No.48) terminal 0 V

l

Check battery voltage.

l

Resistance between ECU (ABD:No.28 & 29,

ABS:No.19) pins and battery negative terminal :

less than 20 m

W

l

Resistance between ECU No.1 (ABS:NO.15) pin and

ignition terminal : less than 60 m

W

l

Check that normal voltage is applied to ECU

(ABD:No.1, ABS:No.15) pin when ignition switch is

turned to "ON" or "OFF".

l

Check ABS fuses of 15A and 80A.

l

Replace the ECU.

l

Check wire (ECU No.50) for open or loose contact.

l

Check connection between connectors.

l

Check relevant wires for open or short.

(When connector is removed)

l

Check voltage between ECU side ground (ABD:No.1,

ABS:No.15 pin) and acceleration sensor side ground

(ABD:No.1, ABS:No.15 pin / ECU side ABD:No.39,

ABS:No.30 pin)

(When connector is installed and power is applied)

-

Voltage : less than 0.25 V

l

Check voltage among related terminals.

(When connector is installed and power is applied)

-

Voltage between ECU (ABD:No.43, ABS:No.28 pin

and ABD:No.39, ABS:No.30 pin)

: 4.75 - 5.25 V

-

Signal voltage between ECU (ABD:No.51,

ABS:No.10) pin and (ABD:No.39, ABS:No.30) pin

: 1.95 V - 3.45 V

(Measure it by laying acceleration sensor horizon-

tally and without external force)