ABS MITSUBISHI MONTERO 2000 Service Workshop Manual

ABS <4WD> -Troubleshooting35B-20
Inspection procedure 3
The ABS warning lamp does not illuminate when the
ignition key is turned to ON (engine stopped).
Probable cause
When power is first supplied to the ABS-ECU, the ABS-ECU turns the ABS-ECU
valve relay from off to on, off and back to onagain aspart of its initial check.
Accordingly, if the ABS warninglampdoes not illuminate, the cause is probably
an opencircuit in the ABS warninglamppower supply circuit, a blownlamp bulb
or an opencircuit between the ABS warninglamp and theABS-ECU.DBlown fuse
DBlown ABS warninglamp bulb
DMalfunction of ABS valve relay
DMalfunction of harness or connector
DMalfunction of combination meter
DMalfunction of the ABS-ECU
NG
Replace the combination meter.
NG
Repair
OK
NG
Check for a blown bulb.Replace the ABS
warning lamp bulb.
OK
NG
Repair
OK
Check the trouble symptoms.
Multi - purpose fuse No. 6 checkNGRefer to GROUP 00 – Inspection service Points for Blown
Fuse.
NG
Check the harness wire.
DBetween ignition switch and combination meter
DBetween the combination meter and the ABS-ECU
OK
OK
After replacing the ABS-ECU, carry out the following check.
DCheck the harness wire between the ABS warning lamp,
ABS valve relay and earth.
Check the following connector:E-107
NG
RepairCheck the trouble symptoms.OK
NG
Check the following connectors:D-01, D-208, D-210
, D-213 , E-10, E-107
Measure at the ABS-ECU connector E-107.
DDisconnect the connector and measure at the harness
side.
DIgnition switch: ON
DWarning lamp conditionwhen terminal 50 is shorted to
body earth
OK:Illuminates
Inspection procedure 4
The ABS warning lamp remains illuminated after the
engine has started.
Probable cause
The cause is probably a short-circuit in the ABS warninglamp illuminationcircuit.DMalfunction of combination meter
DMalfunction of harness (short-circuit)
DMalfunction of the ABS-ECU
NOTE
This trouble symptom is limited to cases where communication with the MUT-II is possible(ABS-ECU
power supply is normal) and the diagnosis code is a normal diagnosis code.
When the ABS valve relay connector B-21X and the
ABS-ECU connector E-107 are disconnected and the ignition
switch is turned to the ON position, does the ABS warning
lamp remain illuminated?YES
NO
Replace the ABS-ECU.
Replace the combination meter.
NG
Repair
OK
Check the harness wire.
DBetween the ABS warning lamp, the ABS-ECU and the
ABS valve relay


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ABS <4WD> -Troubleshooting35B-21
Inspection procedure 5
Abnormal brake operation
Probable cause
Braking operation variesdepending on the driving conditions and the road
surface, which can make it difficult to diagnose a problem. However, if the
diagnosis codes displayed are normal, carry out the following inspection
procedure.DIncorrect wheel speed sensor installation
DMalfunction of harness or connector
DMalfunction of wheel speed sensor
DMalfunction of ABS rotor
DForeign material adhering to speed sensor
DMalfunction of wheel bearing
DMalfunction of HBB
DMalfunction of the ABS-ECU
Wheel speed sensor installation checkNG
Repair
OKCheck the hydraulic unit inside the hydraulic brake booster
(HBB). (Refer to P.35B-29.)
NG
Check the wheel speed sensor (Refer to P.35B-34.)NG
OK
Check the ABS rotor (Refer to P.35B-33).NG
Replace
OK
NG
Replace
OK
NG
Repair
OK
NG
NG
OK
Check the following connector:E-106
OK
Check the trouble symptoms.
NG
Replace the ABS-ECU.NG
Repair
Check the harness, and repair if necessary.
DBetween each wheel speed sensor and ABS-ECU ReplaceMeasure 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 k
W
(Move the sensor harness and connector while checking at
this time.)
Check the following connectors:A-04 , A-23, A-39,
D-124, D-143 , E-10, E-106, F-17, G-11, G-15
Wheel bearing check
(Refer to GROUP 26, 27 - On-vehicle Service.)
Check the trouble symptoms.
Wheel speed sensor output voltage check (Refer to P.35B-27.)OK


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ABS <4WD> -Troubleshooting35B-22
DATA LIST REFERENCE TABLE
The following ECU input data items can be read using the MUT-II
.
(1) When system is normal
Item
No.Check itemInspection conditionsNormal condi-
tion
11Front - right wheel
speedWhen vehicle is being drivenSpeedometer
display and
12Front - left wheel
speedMUT-IIdisplay
are identical.
13Rear - right wheel
speed
14Rear - left wheel
speed
16System voltageIgnition switch: ON6.5 - 22.3 V
26Center differential
lock switchIgnition switch: ONTransfer selector lever position:
2H, 4HOFF
Transfer selector lever position:
4HLc, 4LLcON
27Rear differential lock
switchIgnition switch: ONOFF
32G sensorD
Ignition switch: ON
D
When vehicle is stationary (level)2.4 - 2.6 V
When vehicle is being driven1.0 - 4.0 V
33Stop lampIgnition switch: ONWhen brake pedal is depressedON
SwitchWhen brake pedal is releasedOFF
(2) When system is interrupted by the ECU
When the diagnosis function has caused the operation of the ABS-ECU to be stopped, the
MUT-II
display data may be different from the actual condition.
ACTUATOR TEST TABLE
The following actuators can be force-driven using the MUT-II
.
NOTE
(1) Actuator tests cannot be carried out when the operation of the ABS-ECU has been stopped by
the fail-safe function.
(2) Actuator tests can only be carried out while the vehicle is stopped.
ACTUATOR TEST SPECIFICATIONS
Item No.Check itemDrive Contents
01FR wheel solenoid valveHBB select solenoid valves and control solenoid valves for the
02FL wheel solenoid valverespective channel
03RR wheel solenoid valve
04RL wheel solenoid valve
27Air bleeding (1)HBB select solenoid valves and control solenoid valve OUT (FR, FL)
28Air bleeding (2)HBB control solenoid valve OUT (RR, RL)


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ABS <4WD> -Troubleshooting35B-25
Termi-
nal
No.Normal condition Inspection conditions Check item
37ABS valve relay outputIgnition
switch: ONWhen system abnormality is
detected and relay is offSystem voltage
When relay is on approx. 1
second after engine starts2 V or less
39Brake warning lamp outputIgnitionWhen lamp is switched off2 V or less
switch: ONWhen lamp is illuminatedSystem voltage
40Control solenoid valve OUT (RL)Ignition switch: ONSystem voltage
41Control solenoid valve OUT(FR)Ignition switch: ONSystem voltage
46Center differential lock switch
input Ignition
switch: ONTransfer selector lever position:
2H, 4HSystem voltage
Transfer selector lever position:
4HLc, 4LLc2 V or less
4WD detection switch input
Ignition
switch: ONTransfer selector lever position:
2HSystem voltage
Transfer selector lever position:
4H2 V or less
47Diagnosis select inputWhen the MUT-IIis connected1 V or less
When the MUT-IIis not connectedApprox. 12 V
48Valve relay monitorIgnition switch: ONSystem voltage
50ABS warning lamp outputIgnitionWhen lamp is switched offSystem voltage
switch: ONWhen lamp is illuminated2 V or less
51Control solenoid valve IN (RL)Ignition switch: ONSystem voltage
52Control solenoid valve IN (FR)Ignition switch: ONSystem voltage


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O
N-V EH IC LE SER VIC E
W HEEL SPEED SEN SO R OUTP U T VO LTA G E
M EA SU REM EN T
N O TE
T here are tw o EC Us wit h th e sa m e sh ape in sid e th e
f lo or co nso le , one above th e oth er. The upper EC U is
t h e ABS-E C U and has a blu e co nnecto r. The lo w er EC U
i s th e tr a nsfe r-E C U and has a gre en co nnecto r.
( 1 ) Lif t up th e ve hic le and re le ase th e park in g bra ke .
( 2 ) Dis co nnect th e ABS-E C U co nnecto r and measu re at th e
h arn ess-s id e co nnecto r.
( 3 ) Rota te th e wheel to be measu re d by 1/2 to 1tu rn ,and
u se amult im ete r (A C mV ra nge) or an oscillo sco pe to
c h eck th e outp ut vo lt a ge at th is tim e.
T e rm in al No.
F ro nt- le ft F
ro nt- rig ht R
ear- le ft R
ear- rig ht 7 1
0 9 8
2
0 2
3 2
2 2
1 W
hen en gin e is id lin g (5 -6
k m /h )
D ra n ge (A /T ) or 1st gear (M /T )

C
ause R
em edy W
ave patte rn am plit u de is to o sm all
o r is non-e xis te nt. M
alf u nctio n of w heelsp eed se nso r R
epla ce th e se nso r. E
xce ssiv e va ria tio n in wave patte rn
a m plit u de E
xce ssiv e axle hub ru nout or off s e t R
epla ce th e hub. (
H ow eve r, th is is nota pro ble m if th e
m in im um am plit u de is 120 mV or
h ig her.) M
alf u nctio n of A BS-E C U earth R
epair N
ois e appearin g in wave patte rn , or O
pen cir c u it in se nso r R
epla ce th e se nso r. d
is to rte d wave patte rn O
pen cir c u it in harn ess R
epair th e harn ess. I
n co rre ct w heelsp eed se nso r in sta l-
l a tio n I
n sta ll th e se nso r co rre ctly . C
hip ped or bro ke n ABS ro to r te eth R
epla ce th e ABS ro to r. T
e rm in alN o. a
ge 1 2 3 4 5
W
hen no
c u rre nt is
s u pplie d W
hen cu r-
r e nt is su p-
p lie d V
alv e re la y w
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ABS <4WD> -On-vehicle Service35B-31
WHEN THE BATTERY IS FLAT
If the engine is started using a booster cable when the battery
is completely flat, and the vehicle is then driven without waiting
for the battery to be recharged, the engine may misfire and it
may not be possible to drive the vehicle. This is because the
ABS consumes a large amount of current when carrying out its
initial checks. If this happens, recharge the battery fully.
Caution
The vehicle posture will be unstable during braking, so
do not drive the vehicle with the ABS-ECU connector
disconnected or with the ABS not operating for any other
reason.


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W
HEEL SPEED SEN SO R
R EM OVA L AND IN STA LLA TIO N R
ear
1 2
3 4
5
6
F ro nt w heel sp eed sen so r re m oval
s te p s
A A
"
1. Fro nt wheel sp eed se nso rs
2 . Fro nt ABS ro to r pro te cto r
3 . Fro nt ABS ro to r
( R efe r to GRO UP 26 -Driv e Shaft.) R
ear w heel sp eed sen so r re m oval
s te p s
A B
"
4. R ear wheel sp eed se nso r
5 . R ear ABS ro to r pro te cto r
6 . R ear ABS ro to r
( R efe r to GRO UP 27 -Driv e Shaft.)
N O TE
T he fr o nt and re ar ABS ro to rs are in te gra te d wit h
t h e driv e sh aft and ca nnot be dis a sse m ble d.
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

54A-3
ON-VEHICLE SERVICE 46......................
Room Lamp Delay-off Time Adjustment
Procedure 46...............................
REAR COMBINATION LAMP 47...........
SPECIAL TOOLS 47...........................
TROUBLESHOOTING 47.......................
REAR COMBINATION LAMP 47................
HIGH-MOUNTED STOP LAMP 48.........
COLUMN SWITCH 48....................
SPECIAL TOOLS 48...........................
COLUMN SWITCH 48..........................
HAZARD WARNING LAMP SWITCH 50....
SPECIAL TOOLS 50...........................
HAZARD WARNING LAMP SWITCH 50.........
HORN 51................................
CIGARETTE LIGHTER 51.................
ACCESSORY SOCKET 51................
RHEOSTAT 52...........................
CLOCK OR CENTER DISPLAY 53........
TROUBLESHOOTING 53.......................
CLOCK OR CENTER DISPLAY 67..............
RADIO/TAPE PLAYER 68.................
TROUBLESHOOTING 68.......................
RADIO AND CD AUTO CHANGER 81..........
FRONT SPEAKERS 82...................
REAR SPEAKERS 82.....................
ANTENNA83 ............................DEFOGGER 86...........................
TROUBLESHOOTING AUTOMATIC AIR CONDITIONER> 86...........
ON-VEHICLE SERVICE 86.....................
Printed Heater Check 86.....................
Defogger Relay Continuity Check 86...........
DEFOGGER SWITCH 87.......................
SMART WIRING SYSTEM (SWS)
Refer to GROUP 54B ....................
RADIATOR (RADIATOR FAN MOTOR)
Refer to GROUP 14 ......................
AUTOMATIC TRANSMISSION
Refer to GROUP 23 ......................
ANTI-LOCK BRAKE SYSTEM (ABS)
Refer to GROUP 35B ....................
DOOR HANDLE LATCH (DOOR LOCK)
Refer to GROUP 42 ......................
DOOR GLASS-REGULATOR (POWER
WINDOWS)
Refer to GROUP 42 ......................
KEYLESS ENTRY SYSTEM
Refer to GROUP 42 ......................
WINDSHIELD WIPER/WASHER
Refer to GROUP 51 ......................
REAR WIPER/WASHER
Refer to GROUP 51 ......................
SRS AIRBAG Refer to GROUP 52B......
HEATER Refer to GROUP 55.............
AIR CONDITIONER Refer to GROUP 55...


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F
ig . 4 E
nsu re pro per co nnectio n. Y
ES D
oes nois e appear when th e ra dio sw it c h is tu rn ed on while
t h e ve hic le is sto pped and th e ra dio is str u ck while tu ned
a w ay fr o m asta tio n? N
O S
ta tic ele ctr ic it y nois e :
B ody sta tic ele ctr ic fr o m th e sh ock abso rb er ru bber bush in gs
u se d to pre ve nt vib ra tio n, ty re s, etc . occu rs beca use of se pa-
r a tio n fr o m th e earth , ca usin g a buzzin g nois e . Sin ce no mea-
s u re s ca n be ta ke n on th e ra dio sid e, oth er ste ps sh ould be
t a ke n to dis ch arg e th e sta tic ele ctr ic it y of th e ve hic le body. Y
ES I
s th e ra dio co rre ctly earth ed? (Is th e mountin g scre w tig ht-
e ned se cu re ly ? ) N
O T
ig hte n th e scre w se cu re ly . Y
ES I
s th e ante nna co rre ctly earth ed? (If nois e appears when th e
a nte nna is move d, th is means th e earth is not se cu re ly co n-
n ecte d.) N
O I
f ru st is pre se nt at th e ante nna earth scre w , cle an and tig hte n
t h e earth se cu re ly . Y
ES R
epair or re pla ce ra dio .
A -6 Ever-p re sen t nois e.