MITSUBISHI MONTERO 2000 Service Repair Manual

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O AD SEN SIN G PR O PO RTIO NIN G VA LV E
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D o not dis assem ble th e lo ad sen sin g pro portio nin g valv e. S
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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 Information35B-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
ItemSpecifications
ABS control method4-sensor, 4-channel
No. of ABS rotor teethFront50
Rear50
ABS speed sensorTypeMagnet coil type
Gap between sensor and rotor mm0.9 (non-adjustable type)


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S
to p la m p sw it c h G
se nso r C
ente r dif f e re ntia llo ck sw it c h or
4 W D dete ctio n sw it c h H
yd ra ulic bra ke
b ooste r (H BB) V
alv e re la y D
ia gnosis co nnecto r A
BS-E C U W
heels p eed se nso r
w
ww.W ork sh opM an uals .c o .u k
P urc h ased f r o m w ww.W ork sh opM an uals .c o .u k

S
ER VIC E SPEC IF IC ATIO NS
I te m S
ta ndard va lu e C
ontr o lso le noid va lv e re sis ta nce W 4
.7 5 -5.2 5 O
UT 2
.0 -2.4 S
ele ct so le noid va lv e re sis ta nce W W
heelsp eed se nso r te rm in alre sis ta nce kW W
heelsp eed se nso r in su la tio n re sis ta nce kW N
o. N
am e A
pplic a tio n M
B991502 M
UT-II su b as-
s e m bly C
heckin g th e ABS
( D ia gnosis dis p la y usin g th e MUT-II ) M
B991529 D
ia gnosis co de
c h eckin g harn ess C
heckin g th e ABS
( D ia gnosis dis p la y usin g th e ABS warn in g
l a m p) M
B991348 T
e st harn ess se t C
heckin g th e G se nso r E
xp la natio n of sym pto m W
hen th e engin e sta rts , a kn ockin g so und ca n be heard co m in g fr o m
t h e engin e co m partm ent. T
his so und occu rs as a re su lt o fs yste m
o pera tio n ch eckin g, and is not a
m alf u nctio n. 1
. The bra ke pedalfe elin g ch anges and nois e is genera te d.( R attlin g)
2 . When th e ABS is opera tin g, nois e is genera te d by parts of th e
v e hic le ch assis as co ntr o ltu rn s on and off . (T hum p: su sp ensio n;
s q ueak: ty re s) T
his is th e so und of norm al syste m
o pera tio n, and is not a malf u nctio n. S
hocks are fe lt if th e bra ke pedal is depre sse d when driv in g at lo w
s p eed. T
his is due to syste m opera tio n
c h eckin g (s ta rtin g -o f ch eck when th e
v e hic le sp eed re ach es a ce rta in
n um ber of km /h ) and is not a
m alf u nctio n.

ABS <4WD> -Troubleshooting35B-7
INSPECTION CHART FOR DIAGNOSIS CODES
Diagnosis code
No.Diagnosis itemReference page
11Wheel speed sensor (FR) system (open circuit or short - circuit)35B-8
12Wheel speed sensor (FL) system (open circuit or short - circuit)35B-8
13Wheel speed sensor (RR) system (open circuit or short - circuit)35B-8
14Wheel speed sensor (RL) system (open circuit or short - circuit)35B-8
15Wheel speed sensor system (output signal abnormality)35B-9
16ABS-ECU or valve relay power supply system (abnormal voltage
drop or rise)35B-10
21Wheel speed sensor (FR) system35B-8
22Wheel speed sensor (FL) system35B-8
23Wheel speed sensor (RR) system35B-8
24Wheel speed sensor (RL) system35B-8
26Center differential lock switch system35B-11, 12
27Rear differential lock switch system35B-11, 12
32G sensor system35B-13
33Stop lamp switch system35B-14
41Control solenoid valve (FR)
systemIf there is no response to the
solenoid valve drive signal35B-15
42Control solenoid valve (FL)
systemcorresponding to each respec-
tive item
43Control solenoid valve (RR)
system
44Control solenoid valve (RL)
system
45Changeover solenoid valve
(FR) system
46Changeover solenoid valve
(FL) system
51Valve relay system (ON problem)35B-16
52Valve relay system(OFFproblem)35B-17
55HBB systemCarry out HBB troubleshoot-
ing. (Refer to GROUP 35A.)
63ABS-ECU system35B-32 (ABS-ECU replace-
ment)
NOTE
*: Code No.16 is erased from the memory if the condition returns to normal.


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