Mitsubishi Pajero Manual de instrucciones

ANTI-SKID BRAKING

SYSTEM (ABS) <4WD>

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35B-1

ANTI-SKID

BRAKING SYSTEM

(ABS) <4WD>

CONTENTS

GENERAL INFORMATION 2..................

SERVICE SPECIFICATIONS 4.................

LUBRICANT Refer to GROUP 35A...........

SEALANTS Refer to GROUP 35A............

SPECIAL TOOLS 4..........................

TROUBLESHOOTING 4.......................

ON-VEHICLE SERVICE 27...................

Wheel Speed Sensor Output Voltage

Measurement 27...............................

ABS Valve Relay Continuity Check 28...........

Hydraulic Brake Booster (HBB) - Hydraulic Unit

Check 29......................................

Solenoid Valve Check 30.......................

When the Battery is Flat 31....................

Brake Pedal Check and Adjustment

Refer to GROUP 35A..........................

Hydraulic Brake Booster (HBB) Operation Check

Refer to GROUP 35A..........................

Hydraulic Brake Booster (HBB) Check

Refer to GROUP 35A..........................

Motor Relay Continuity Check

Refer to GROUP 35A..........................

Bleeding Refer to GROUP 35A..................

Brake Fluid Level Sensor Check

Refer to GROUP 35A..........................

Disc Brake Pad Check and Replacement

Refer to GROUP 35A..........................

Brake Disc Thickness Check

Refer to GROUP 35A..........................

Brake Disc Runout Check and Correction

Refer to GROUP 35A..........................

BRAKE PEDAL Refer to GROUP 35A........

HYDRAULIC BRAKE BOOSTER (HBB)

Refer to GROUP 35A........................

HBB BUZZER Refer to GROUP 35A..........

FRONT DISC BRAKE Refer to GROUP 35A..

REAR DISC BRAKE Refer to GROUP 35A....

ABS-ECU 32................................

WHEEL SPEED SENSOR 33.................

G-SENSOR 36..............................

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ABS <4WD> - General Information

35B-2

GENERAL INFORMATION

ABS has been adopted as standard equipment

in all vehicles to maintain directional stability and

steering performance during sudden braking.

The ABS control method used is a 4-sensor,

4-channel method (previous models: 4-sensor,

3-channel method)which allows the brake

pressures for all four wheels to be controlled

independently of each other. The system has the

following features.

DEBD*(Electronic Brake force Distribution

system) control has been added to provide the

ideal braking force for the rear wheels.

DThe hydraulic unit function has been integrated

with the hydraulic brake booster (HBB).

DSelect solenoid valves (two valves for FL and

FR) have been adopted in order to reduce the

pedal kickback and improve the operation

feeling when the ABS is operating.

DIndependent 4-wheel control is carried out wile

the vehicle is turning in order to increase the

braking force.

NOTE

*EBD: Electronic Brake-force Distribution

EBD CONTROL

In ABS, electronic control method is used whereby

the rear wheel brake hydraulic pressure during

braking is regulated by rear wheel control solenoid

valves in accordance with the vehicle’s rate of

deceleration and the front and rear wheel slippage

which are calculated from the signals received from

the various wheel sensors. EBD control is a control

system which provides a high level of control for

both vehicle braking force and vehicle stability. The

system has the following features.

DBecause the system provides the optimum rear

wheel braking force regardless of the vehicle

laden condition and the condition of the road

surface, the system reduces the required pedal

depression force, particularly when the vehicle

is heavily laden or driving on road surfaces

with high frictional coefficients.

DBecause the duty placed on the front brakes

has been reduced, the increases in pad

temperature can be controlled during front

brakes applying to improve the wear resistance

characteristics of the pad.

DControl valves such as the proportioning valve

are no longer required.

SPECIFICATIONS

Item Specifications

ABS control method 4-sensor, 4-channel

No. of ABS rotor teeth Front 50

Rear 50

ABS speed sensor Type Magnet coil type

Gap between sensor and rotor mm 0.9 (non-adjustable type)

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ABS <4WD> - General Information 35B-3

STRUCTURAL DIAGRAM

Wheel speed sensor

Stop lamp switch

G sensor

Center differential lock switch or

4WD detection switch

Hydraulic brake

booster (HBB)

Valve relay

Diagnosis connector

ABS-ECU

Wheel speed sensor

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ABS <4WD> - Service Specifications/Special Tools/Troubleshooting

35B-4

SERVICE SPECIFICATIONS

Item Standard value

Control solenoid valve resistance WIN 4.75 - 5.25

OUT 2.0 - 2.4

Select solenoid valve resistance W3.5 - 3.9

Wheel speed sensor terminal resistance kW1.0 - 1.5

Wheel speed sensor insulation resistance kW100 or more

SPECIAL TOOLS

Tools No. Name Application

MB991502 MUT-II sub as-

sembly

Checking the ABS

(Diagnosis display using the MUT-II)

MB991529 Diagnosis code

checking harness

Checking the ABS

(Diagnosis display using the ABS warning

lamp)

MB991348 Test harness set Checking the G sensor

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING

Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.

PRECAUTIONS WHEN CARRYING OUT DIAGNOSIS

(1) The ABS is a system which controls the brake pressure by means of the operation of the ECU.

Accordingly, the following symptoms may occur at times, but these are a sign of normal ABS operation,

and do not indicate a malfunction.

Symptom Explanation of symptom

When the engine starts, a knocking sound can be heard coming from

the engine compartment.

This sound occurs as a result of system

operation checking, and is not a

malfunction.

1. The brake pedal feeling changes and noise is generated.(Rattling)

2. When the ABS is operating, noise is generated by parts of the

vehicle chassis as control turns on and off. (Thump: suspension;

squeak: tyres)

This is the sound of normal system

operation, and is not a malfunction.

Shocks are felt if the brake pedal is depressed when driving at low

speed.

This is due to system operation

checking (starting- of check when the

vehicle speed reaches a certain

number of km/h) and is not a

malfunction.

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ABS <4WD> - Troubleshooting 35B-5

(2) For road surfaces such as snow-covered roads and gravel roads, the braking distance for vehicles

with ABS can sometimes be longer than that for other vehicles. Accordingly, advise the customer

to drive safely on such roads by lowering the vehicle speed and not being too overconfident.

(3) Diagnosis detection conditions vary according to the diagnosis code. When re-checking trouble

symptoms, the conditions given in the “Explanation” column of the Inspection Chart Classified by

Trouble Symptoms must always be satisfied.

ABS WARNING LAMP INSPECTION

Check that the ABS warning lamp illuminates in the following

way.

Even if the pressure inside the accumulator of the hydraulic

brake booster (HBB) is below the specified value, the ABS

warning lamp will illuminate because ABS operation has been

stopped. In such cases, if the HBB pump is driven by the

accumulated pressure inside the accumulator and causes

the ABS warning lamp to switch off, it does not indicate a

system malfunction.

(1) When the ignition switch is turned to the ON position,

the ABS warning lamp illuminates* for approximately 3

seconds, and then switches off.

(2) When the ignition switch is turned to the START position,

the ABS warning lamp remains illuminated.

(3) When the ignition switch returns from the START to the

ON position, the ABS warning lamp illuminates* for

approximately 3 seconds, and then remains switched off.

(4) If any of the above do not occur, check the diagnosis

codes.

NOTE

*: The ABS warning lamp may remain illuminated after the

ignition switch is turned to the ON position and the vehicle

starts moving until the vehicle speed reaches a speed

of several km/h. This only occurs if a diagnosis code

from No. 21 to No. 24 relating to a wheel speed sensor

malfunction was generate when the ignition switch was

last turned to the ON position and is still stored in the

ABS-ECU. The ABS-ECU will cause the ABS warning

lamp to illuminate until the point where it can ascertain

(during the starting-off check) that the problem associated

with this diagnosis code has returned to normal.

DIAGNOSIS FUNCTION

READING DIAGNOSIS CODES

Use the MUT-II or the ABS warning lamp to read the diagnosis

codes.

(Refer to GROUP 00 - How to Use Troubleshooting/Inspection

Service Points.)

NOTE

Connect the MUT-II to the 16-pin diagnosis connector.

ABS warning lamp

Approx. 3 s Approx. 3 s

ABS warn-

ing lamp On

Off

Ignition

switch

START

ACC,

LOCK

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ABS <4WD> - Troubleshooting

35B-6

ERASING DIAGNOSIS CODES

When using the MUT-II

Connect the MUT-II to the diagnosis connector and erase

the diagnosis codes.

Caution

Turn the ignition switch to the LOCK (OFF) position when

connecting and disconnecting the MUT-II.

NOTE

Connect the MUT-II to the 16-pin diagnosis connector.

When not using the MUT-II

(1) Stop the vehicle.

(2) Turn the stop lamp switch to ON (brake pedal depressed).

(3) In this condition (after carrying out steps 1) to 2)), turn

the ignition switch to the ON position. Then turn off the

stop lamp switch (release the brake pedal) within 3

seconds, and then turn the stop lamp switch on and off

again a further 10 times.

NOTE

If the functioning of the ABS-ECU has been stopped by the

fail-safe function, the diagnosis codes cannot be erased.

With-

in 1 s With-

in 1 s

With-

in 1 s

With-

in 1 s

With-

in 1 s

With-

in 1 s With-

in 1 s

With-

in 1 s

With-

in 1 s With-

in 1 s

Within 3 s

1st 2nd 3rd 4th 5th 6th 7th 8th

9th

10th Erasing

complete

Ignition switch ON

LOCK (OFF)

Stop lamp switch ON

OFF

ABS warning

lamp

OFF

Trouble code memory

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ABS <4WD> - Troubleshooting 35B-7

INSPECTION CHART FOR DIAGNOSIS CODES

Diagnosis code

No.

Diagnosis item Reference page

11 Wheel speed sensor (FR) system (open circuit or short- circuit) 35B-8

12 Wheel speed sensor (FL) system (open circuit or short- circuit) 35B-8

13 Wheel speed sensor (RR) system (open circuit or short-circuit) 35B-8

14 Wheel speed sensor (RL) system (open circuit or short- circuit) 35B-8

15 Wheel speed sensor system (output signal abnormality) 35B-9

16 ABS-ECU or valve relay power supply system (abnormal voltage

drop or rise)

35B-10

21 Wheel speed sensor (FR) system 35B-8

22 Wheel speed sensor (FL) system 35B-8

23 Wheel speed sensor (RR) system 35B-8

24 Wheel speed sensor (RL) system 35B-8

26 Center differential lock switch system 35B-11, 12

27 Rear differential lock switch system 35B-11, 12

32 G sensor system 35B-13

33 Stop lamp switch system 35B-14

41 Control solenoid valve (FR)

system

If there is no response to the

solenoid valve drive signal

35B-15

42 Control solenoid valve (FL)

system

corresponding to each respec-

tive item

43 Control solenoid valve (RR)

system

44 Control solenoid valve (RL)

system

45 Changeover solenoid valve

(FR) system

46 Changeover solenoid valve

(FL) system

51 Valve relay system (ON problem) 35B-16

52 Valve relay system (OFF problem) 35B-17

55 HBB system Carry out HBB troubleshoot-

ing. (Refer to GROUP 35A.)

63 ABS-ECU system 35B-32 (ABS-ECU replace-

ment)

NOTE

*: Code No.16 is erased from the memory if the condition returns to normal.

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ABS <4WD> - Troubleshooting

35B-8

INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE

Code No. 11, 12, 13, 14 Wheel speed sensor system

(open circuit or short-circuit)

Probable cause

Code No. 21, 22, 23, 24 Wheel speed sensor system

Code Nos. 11, 12, 13, 14 are output when the open circuit or short-circuit

detection carried out by the ABS-ECU hardware circuit detects that there is an

open circuit or short-circuit in the (+) or ( - ) wire in one of the four wheel speed

sensors and signals are consequently not being input.

DMalfunction of wheel speed sensor

DMalfunction of harness or connector

DMalfunction of the ABS-ECU

Code No. 21, 22, 23, 24 are output at the following times:

DIf an open circuit cannot be verified, but one or more of the wheel speed

sensors does not output any signal when the vehicle speed is a certain

number of km/h or higher.

DWhen a problem such as chipped or plugged- up rotor tooth is detected, or if

the sensor output drops and anti- skid control is continuously carried out due

to a malfunctioning sensor or a warped ABS rotor.

DMalfunction of wheel speed sensor

DMalfunction of harness or connector

DMalfunction of ABS rotor

DExcessive clearance between sensor and ABS

rotor

DMalfunction of the ABS-ECU

DMalfunction of wheel bearing

Replace the ABS-ECU.

Repair

Check the trouble symptoms.

Check the following connector: E-106

Wheel bearing check

(Refer to GROUP 26, 27 -

On-vehicle Service.)

Replace

ABS rotor check

(Refer to P.35B-33.)

Replace

Wheel speed sensor check

(Refer to P.35B-34.)

Wheel speed sensor output voltage check (Refer to P.35B-27.)

Check the following connectors: A-04 <L.H.D.>, A-23, A-39,

D-124, D-143 <R.H.D.>, E-10, E-106, F-17, G-11, G-15

Wheel speed sensor installation check NG Repair

Measure at ABS-ECU connector E-106.

DDisconnect the connector and measure at the harness

side.

DFront: resistance between 10 – 23, 7 – 20

Rear: resistance between 8 – 21, 9 – 22

OK: 1.0 - 1.5 kW

Replace

Repair

Check the trouble

symptoms.

Check the harness wire, and repair if necessary.

DBetween each wheel speed sensor and ABS-ECU

Wheel speed sensor check (Refer to P.35B-34.)

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ABS <4WD> - Troubleshooting 35B-9

Code No. 15 Wheel speed sensor system (output signal

abnormality)

Probable cause

This malfunction code is output when any one of the wheel speed sensor output

signals during driving is abnormal (except open and short circuit).

DUneven tyre size for all four wheels

DIncorrect wheel speed sensor installation

DMalfunction of wheel speed sensor

DMalfunction of harness or connector

DMalfunction of ABS rotor

DMalfunction of wheel bearing

DMalfunction of the ABS-ECU

Check the harness wire, and repair if necessary.

DBetween each wheel speed sensor and ABS-ECU

Wheel bearing check

(Refer to GROUP 26, 27 - On-vehicles Service.

Replace

OK NG

Replace

Replace the ABS - ECU.

Check the trouble

symptoms.

Repair

Check the following connector: E-106

Wheel speed sensor output voltage check (Refer to P.35B-27.)

NG Wheel speed sensor check (Refer to P.35B-34.)

Wheel speed sensor installation check NG Repair

Are the tyres on all four wheels of identical size?

Fit tyres which are of identical size.

YES

Check the trouble symptoms.

Check the ABS rotor (Refer to P.35B-33).

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