MITSUBISHI TRITON 1997 Workshop Manual

ABS <2WD> ± Troubleshooting35B-18
Inspection Procedure 7
Brake operation is abnormal.
Probable cause
This varies depending on the driving conditions and the road surface conditions, so
problem diagnosis is difficult. However, if a normal diagnosis code is displayed, carry
out the following inspection.
Improper installation of wheel speed sensor

Incorrect sensor harness contact

Foreign material adhering to wheel speed sensor

Malfunction of wheel speed sensor

Malfunction of rotor

Malfunction of wheel bearing

Malfunction of hydraulic unit

Malfunction of ABS-ECU
OK
Check trouble symptom.NGReplace the ABS-ECU.
OK
Check the following connector.
C-62NG
Repair
NG
Measure at ABS-ECU connector C-62.

Disconnect the connector and
measure at the harness side.

Resistance value between terminals
10-23, 7-20, 8-21 and 9-22
OK:1.2 ± 1.4 kW
(The sensor harness and connector
should be moved while these
inspections are carried out.)NG
Repair
OK
Check trouble symptom.
OK
Check the following connectors.
A-01, A-07, F-01, F-16, D-01, and C-02NG
Repair
OK
Wheel bearing check. (Refer to GROUP
26 and 27 ± On-vehicle Service.)NG
Repair
OK
Rotor check. (Refer to P.35B-40.)NGReplace the rotor.
OK
Hydraulic unit check. (Refer to P.
35B-26.)
OK
Wheel speed sensor output voltage
check. (Refer to P. 35B-24.)NGWheel speed sensor check. (Refer to
P. 35B-39.)NGReplace the wheel speed sensor.
Wheel speed sensor installation check.NG
Repair

C
heck it e m C
heckin g r e quir e m ents N
orm al v a lu e 1
1 F
ro nt- rig ht w heel s p eed s e nso r P
erfo rm a te st r u n V
ehic le s p eeds d
is l
a ye d on th e 1
2 F
ro nt- le ft w heel s p eed s e nso r d
is la ye d o
n t
h e a
nd MUT II are 1
3 R
ear-rig ht w heel s p eed s e nso r a
n d M
UT 1
4 R
ear-le ft w heel s p eed s e nso r 1
6 A
BS-E C U p ow er s u pply v o lt a ge I
g nit io n s w it c h p ow er s u pply v o lt a ge a nd
v a lv e m onit o r v o lt a ge 9
± 16 V 3
3 S
to p la m p s w it c h D
epre ss th e b ra ke p edal. O
N R
ele ase th e b ra ke p edal. O
FF I
te m 0
1 S
ole noid v a lv e fo r fr o nt- le ft
w heel S
ole noid v a lv e s a nd p um p
m oto rs in th e h yd ra ulic u nit (
i li ti d) 0
2 S
ole noid v a lv e fo r fr o nt- rig ht
w heel (
s im ple in sp ectio n m ode) 0
3 S
ole noid v a lv e fo r r e ar w heel 3
s
A
ctiv atio n p atte rn
S ole
n oid
v a lv e
P um p
m oto r O
N
O FF E
nd 1
s H
yd ra ulic
p re ssu re
h old s H
yd ra ulic
p re ssu re
d ecre ase s

S
ig nal C
heckin g r e quir e m ents N
orm al c o ndit io n 1 O
utp ut to fr o nt- le ft h yd ra ulic
u nit s o le noid v a lv e ( O UT s id e) I
g nit io n s w it c h : O N ( W hen s o le noid v a lv e is
o ff a ppro xim ate ly 1 s e co nd a fte r e ngin e is s ta rte d) S
yste m v o lt a ge 2 O
utp ut to r e ar h yd ra ulic
u nit s o le noid v a lv e ( O UT s id e) 3 O
utp ut to r e ar h yd ra ulic
u nit s o le noid v a lv e ( IN s id e) 1
3 A
BS-E C U p ow er s u pply I
g nit io n s w it c h : O N S
yste m v o lt a ge I
g nit io n s w it c h : S TA R T 0
V 1
4 O
utp ut to fr o nt- le ft h yd ra ulic
u nit s o le noid v a lv e ( IN s id e) I
g nit io n s w it c h : O N ( W hen s o le noid v a lv e is
o ff a ppro xim ate ly 1 s e co nd a fte r e ngin e is s ta rte d) S
yste m v o lt a ge 2
6 O
utp ut to r e la y p ow er s u pply I
g nit io n s w it c h : O N S
yste m v o lt a ge 3
2 M
em ory p ow er s u pply A
lw ays S
yste m v o lt a ge 3
4 I
n put fr o m s to p la m p s w it c h I
g nit io n s w it c h : O N S
to p la m p s w it c h : O N S
yste m v o lt a ge S
to p la m p s w it c h : O FF 1
V o r le ss 3
6 M
UT-II S
eria l
c o m munic a tio n
w it h M UT-II . D
o n ot c o nnect th e M UT-II . 1
V o r le ss 3
7 O
utp ut to v a lv e r e la y I
g nit io n
s w it c h : O
N A
ppro xim ate ly 1 s e co nd a fte r e ngin e
i s s ta rte d, th e r e la y is o n. 2
V o r le ss O
N T
he s yste m r u ns d ow n. T he r e la y is
o ff . S
yste m v o lt a ge 3
8 O
utp ut to m oto r r e la y I
g nit io n s w it c h : O N A r
o xim ate ly 1 se co nd M
oto r is o n. 2
V o r le ss A
ro xim ate ly 1 s
e co nd M
oto r is o ff . S
yste m v o lt a ge 3
9 I
d le -u p s o le noid v a lv e ( + ) I
g nit io n s w it c h : O N ( T he m oto r is o n a ppro xim ate ly
1 s e co nd a fte r e ngin e is s ta rte d.) S
yste m v o lt a ge 4
1 O
utp ut to fr o nt- rig ht h yd ra ulic
u nit s o le noid v a lv e ( O UT s id e) I
g nit io n s w it c h : O N ( W hen s o le noid v a lv e is o ff
a ppro xim ate ly 1 s e co nd a fte r e ngin e is s ta rte d.) S
yste m v o lt a ge

ABS <2WD> ± Troubleshooting35B-21
Connector
terminal No.SignalChecking requirementsNormal condition
43Idle-up solenoid valve (±)Ignition switch: ON (The motor is on approximately
1 second after engine is started.)2 V or less
46Ignition switchIgnition switch: ONSystem voltage
Ignition switch: START0 V
47Input from diagnosis indication
selection
Connect the MUT-II.0 V
selection
Do not connect the MUT-II.Approx. 12 V
48Input from valve relay monitorIgnition switch: ONSystem voltage
49Motor monitorIgnition switch: ON
Approximately 1 second after
Motor is on.System voltage
A roximately 1 second after
engine is startedMotor is off.0.5 V or less
50Output to ABS warning lampIgnition
switch: ON
The lamp is switched off.System voltage
switch: ON
The lamp is illuminated.0 ± 2 V
52Output to front-right hydraulic
unit solenoid valve (IN side)Ignition switch: ON (When solenoid valve is off
approximately 1 second after engine is started.)System voltage

S
ig nal N
orm al c o ndit io n 1
± B ody e arth F
ro nt- le ft s o le noid v a lv e ( O UT s id e) 2
.2 W R
ear s o le noid v a lv e ( O UT s id e) 2
.2 W R
ear s o le noid v a lv e ( IN s id e) 5
.0 W F
ro nt- le ft w heel s p eed s e nso r ( + w ir e ) 1
.2 ± 1 .4 k W R
ear-rig ht w heel s p eed s e nso r ( + w ir e ) 1
.2 ± 1 .4 k W R
ear-le ft w heel s p eed s e nso r ( + w ir e ) 1
.2 ± 1 .4 k W F
ro nt- rig ht w heel s p eed s e nso r ( + w ir e ) 1
.2 ± 1 .4 k W F
ro nt- le ft s o le noid v a lv e ( IN s id e) 5
.0 W A
BS-E C U e arth C
ontin uit y 1
6 ± B ody e arth 2
5 ± B ody e arth 3
9 ± 4 3 I
d le -u p s o le noid v a lv e 3
7 ± 4 4 W F
ro nt- rig ht s o le noid v a lv e ( O UT s id e) 2
.2 W A
BS-E C U e arth C
ontin uit y 4
8 ± B ody e arth V
alv e r e la y m onit o r in put C
ontin uit y 4
9 ± B ody e arth M
oto r m onit o r C
ontin uit y 5
2 ± B ody e arth F
ro nt- rig ht s o le noid v a lv e ( IN s id e) 5
.0 W

O
N-V EH IC LE S ER VIC E 35200150108
B LE ED IN G
C au tio n
U se t h e s p ecif ie d b ra ke f lu id . A vo id u sin g a m ix tu re o f
t h e s p ecif ie d b ra ke f lu id a n d o th er f lu id .
S pecif ie d b ra ke f lu id : D O T3 o r D O T4
M ASTE R C YLIN DER B LE ED IN G
T he m aste r c ylin der u se d h as n o c h eck v a lv e , s o if b le edin g
i s c a rrie d o ut b y th e fo llo w in g p ro ce dure , b le edin g o f a ir fr o m
t h e b ra ke p ip elin e w ill b eco m e e asie r. ( W hen b ra ke flu id is
n ot c o nta in ed in th e m aste r c ylin der. )
( 1 ) Fill th e r e se rv e ta nk w it h b ra ke flu id .
( 2 ) Keep th e b ra ke p edal d epre sse d.
( 3 ) Have a noth er p ers o n c o ve r th e m aste r c ylin der o utle t
w it h a fin ger.
( 4 ) W it h th e o utle t s till c lo se d, r e le ase th e b ra ke p edal.
( 5 ) Repeat s te ps ( 2 ) ± (4 ) th re e o r fo ur tim es to fill th e in sid e
o f th e m aste r c ylin der w it h b ra ke flu id .
B RAKE P IP E L IN E B LE ED IN G
S ta rt th e e ngin e a nd b le ed th e a ir in th e s e quence s h ow n
i n th e fig ure .
C au tio n
B e s u re t o in sta ll a f ilt e r t o t h e m aste r c ylin der r e serv o ir
t a n k w hen s u pply in g b ra ke f lu id .
D IS C B RAKE P A D C HEC K A ND R EPLA CEM EN T
3 5200280012
N O TE
T he b ra ke p ads h ave w ear in dic a to rs th at c o nta ct th e b ra ke
d is c w hen th e b ra ke p ad th ic kn ess b eco m es 2 m m, a nd e m it
a s q uealin g s o und to w arn th e d riv e r.
1 . Check b ra ke p ad th ic kn ess th ro ugh c a lip er b ody c h eck
p ort.
S ta n dard v alu e: 1 0 m m
L im it : 2 .0 m m
C au tio n
1 . When t h e lim it is e xceed ed , r e p la ce t h e p ad s a t
b oth s id es, a n d a ls o t h e b ra ke p ad s f o r t h e w heels
o n t h e o pposit e s id e a t t h e s am e t im e.
2 . If t h ere is a s ig nif ic an t d if fe re n ce in t h e
t h ic kn esses o f t h e p ad s o n t h e le ft a n d r ig ht s id es,
c h eck t h e s lid in g c o ndit io n o f t h e p is to n, l o ck
p in a n d g uid e p in .

F
ro nt le ft F
ro nt
r ig ht R
ear le ft R
ear
r ig ht T
e rm in al N 7 1
0 9 8
N
o. 2
0 2
3 2
2 2
1

P
ro bable c a use s R
em edy T
o o s m all o r z e ro w ave fo rm
a m plit u de F
ault y w heel s p eed s e nso r R
epla ce s e nso r W
ave fo rm a m plit u de flu ctu ate s
e xce ssiv e ly ( th is is n o p ro ble m if
t h e m in im um a m plit u de is 1 00 m V
o r m ore ) A
xle h ub e cce ntr ic o r w it h la rg e r u nout R
epla ce h ub N
ois y o r d is tu rb ed w ave fo rm O
pen c ir c u it in s e nso r R
epla ce s e nso r O
pen c ir c u it in h arn ess C
orre ct h arn ess I
n co rre ctly m ounte d w heel s p eed s e nso r M
ount c o rre ctly R
oto r w it h m is sin g o r d am aged te eth R
epla ce r o to r W
hen id lin g ( 5 ± 6 k m /h ),
1 st g ear ( m anual tr a ns-
m is sio n) o r D r a nge ( a uto -
m atic tr a nsm is sio n) 1
0.0 m s/D IV 1 V /D IV

7
85 ± 981 N R
ear w heel 2
94 ± 490 N

O
pera tio n J
u dgem ent
± N orm al J
u dgem ent
± A bnorm al P
ro bable c a use R
em edy 0
1 (
1 ) Depre ss b ra ke p edal
t o lo ck w heel.
( 2 ) Usin g th e M UT-I I , s
e le ct th e wheel to be B
ra ke fo rc e
r e le ase d fo r
4 s e co nds a
fte r lo ckin g W
heel d oes n ot
l o ck w hen b ra ke
p edal is d epre sse d. C
lo gged b ra ke lin e
o th er th an h yd ra ulic
u nit C
heck a nd c le an
b ra ke lin e 0
2 s
e le ct t
h e w
heel t
o b
e w
heel manually to a
fte r l
o ckin g C
lo gged h yd ra ulic
c ir c u it in h yd ra ulic
u nit R
epla ce h yd ra ulic
u nit a sse m bly 0
3 w
heel m
anually t
o B
ra ke fo rc e is n ot
r e le ase d I
n co rre ct h yd ra ulic
u nit b ra ke tu be
c o nnectio n C
onnect c o rre ctly H
yd ra ulic u nit
s o le noid v a lv e n ot
f u nctio nin g c o rre ctly R
epla ce h yd ra ulic
u nit a sse m bly M
easu re m ent
t e rm in als R
esis ta nce b etw een
t e rm in als . F
ro nt IN ( rig ht s id e) 1
± 5 o r 1 0 5
.0 W 2
± 5 o r 1 0 R
ear IN 3
± 5 o r 1 0 F
ro nt O UT ( rig ht s id e) 6
± 5 o r 1 0 2
.2 W 7
± 5 o r 1 0 R
ear O UT 8
± 5 o r 1 0