MITSUBISHI TRITON 1997 Workshop Manual

G
EN ER AL IN FO RM ATIO N 52400010164
T o im pro ve s a fe ty , th e S R S is a va ila ble a s o ptio nal
p art. T hese s yste m e nhance c o llis io n s a fe ty b y
r e str a in in g th e d riv e r in c a se o f a n a ccid ent.
T he S R S c o nsis ts o f a n a ir b ag m odule , S R S
d ia gnosis u nit ( S D U), S R S w arn in g la m p, tw o fr o nt
i m pact s e nso rs a nd c lo ck s p rin g. A ir b ag is lo ca te d
i n th e c e ntr e o f th e s te erin g w heel. A ir b ag h as
a fo ld ed a ir b ag a nd a n in fla to r u nit . T he c o ntr o l
u nit u nder th e in str u m ent p anel, w hic h m onit o rs
t h e s yste m a nd h as a s a fin g G s e nso r. T he w arn in g
l a m p o n th e in str u m ent p anel in dic a te s th e o
pera tio nal s ta tu s o f th e S R S. E ach fr o nt im pact
s e nso r is lo ca te d le ft a nd r ig ht fe nder s h ie ld p anel.
T he c lo ck s p rin g is in sta lle d in th e s te erin g c o lu m n.
O nly a uth oriz e d s e rv ic e p ers o nnel s h ould d o w ork
o n o r a ro und th e S R S c o m ponents . T hose s e rv ic e
p ers o nnel s h ould r e ad th is m anual c a re fu lly b efo re
s ta rtin g a ny s u ch w ork . E xtr e m e c a re m ust b e u se d
w hen s e rv ic in g th e S R S to a vo id in ju ry to th e s e rv ic e
p ers o nnel ( b y in adve rte nt d eplo ym ent o f th e a ir
b ag) o r th e d riv e r ( b y r e nderin g th e S R S
i n opera tiv e ). A
ir b ag m odule C
lo ck s p rin g B
ody w ir in g
h arn ess S
R S w arn in g la m p F
ro nt w ir in g
h arn ess o r
s e nso r c a ble F
ro nt im pact
s e nso r ( R .H .) S
D U F
ro nt im pact s e nso r ( L .H .) D
ia gnosis c o nnecto r

S
R S S ER VIC E P R EC AUTIO NS 52400030160
1 . In o rd er to a vo id in ju ry to y o urs e lf o r o th ers
f r o m a ccid enta l d eplo ym ent o f th e a ir b ag d urin g
s e rv ic in g, r e ad a nd c a re fu lly fo llo w a ll th e
p re ca utio ns a nd p ro ce dure s d escrib ed in th is
m anual.
2 . Do n ot u se a ny e le ctr ic a l te st e quip m ent o n
o r n ear S R S c o m ponents , e xce pt th ose
s p ecif ie d o n P .5 2B -5 . 3
. Never A tte m pt t o R ep air t h e F ollo w in g
C om ponen ts :

SR S D ia gnosis u nit ( S D U)

Clo ck S prin g

Air B ag M odule

Fro nt im pact s e nso r
4 . Afte r d is co nnectin g t h e b atte ry c ab le , w ait 6 0 s eco nds
o r m ore b efo re p ro ceed in g w it h t h e f o llo w in g w ork .
T he S R S s yste m is d esig ned t o r e ta in e n ough v o lt a g e
t o d ep lo y t h e a ir b ag f o r a s h ort t im e e ven a fte r t h e
b atte ry h as b een d is co nnecte d , s o s erio us in ju ry m ay
r e su lt f r o m u nin te n ded a ir b ag d ep lo ym en t if w ork
i s d one o n t h e S R S s yste m im med ia te ly a fte r t h e
b atte ry c ab le s a re d is co nnecte d . W in d a t a p e a ro und
t h e d is co nnecte d ( ± ) t e rm in al f o r in su la tio n.
5 . To u nlo ck th e S D U c o nnecto r, p la ce a fla t- tip ped
s cre w driv e r a gain st th e lo ck s p rin g a t th e lo ck le ve r n otc h
a nd p ush th e s p rin g to w ard th e u nit . In th is c a se , d o
n ot fo rc e th e lo ck le ve r u p.
6 . Do n ot a tte m pt to r e pair th e w ir in g h arn ess c o nnecto rs
o f th e S R S. If a ny o f th e c o nnecto rs a re d ia gnose d a s
f a ult y , r e pla ce th e w ir in g h arn ess. If th e w ir e s a re
d ia gnose d a s fa ult y , r e pla ce o r r e pair th e w ir in g h arn ess
a cco rd in g to th e fo llo w in g ta ble . L
ock le ve r L
ock s p rin g T
o c lo ck s p rin g T
o b ody w ir in g h arn ess

SRS ± SRS Service Precautions52B-4
Harness
connector
(No. of termi-
nals, colour)SDU terminal No.Destination of harnessCorrective action
2 pins, red1, 2Body wiring harness
Clock springReplace clock spring
±3, 4±±
±5, 6±±
14 pins, red7, 8±±
9Body wiring harness
Diagnosis connectorCorrect or replace each
wiring harness10Body wiring harness
Front wiring harness

Ignition switch (ST)
wiring harness
11Body wiring harness
Junction block (fuse
No.11)
12Body wiring harness
Junction block (fuse
No.10)
13Body wiring harness
Combination meter (SRS
warning lamp)
14±±
15Body wiring harness
Front wiring harness

Front impact sensor (+) (R.H.)Sensor cable* installation
procedures (Refer to
P 52B 39 )16Body wiring harness
Front wiring harness

Front impact sensor (+) (L.H.)P.52B-39.)
17Body wiring harness
Front wiring harness

Front impact sensor (±) (L.H.)
18Body wiring harness
Front wiring harness

Front impact sensor (±) (R.H.)
19, 20Body wiring harness
EarthCorrect or replace each
wiring harness
NOTE
The sensor cable marked with * is available as service part.
7. SRS components should not be subjected to heat over 93
C, so remove the SRS diagnosis unit,
air bag module, clock spring and front impact sensors before drying or baking the vehicle after painting.
8. Whenever you finish servicing the SRS, check warning lamp operation to make sure that the system
functions properly. (Refer to P.52B-16.)
9. Make certain that the ignition switch is OFF when the MUT-II is connected or disconnected.
10. If you have any questions about the SRS, please contact your local distributor.
NOTE
SERIOUS INJURY CAN RESULT FROM UNINTENDED AIR BAG DEPLOYMENT, SO USE ONLY
THE PROCEDURES AND EQUIPMENT SPECIFIED IN THIS MANUAL.

S
ER VIC E S PEC IF IC ATIO NS 52400040071
I te m s S
ta ndard v a lu e F
ro nt im pact s e nso r r e sis ta nce W C
lo ck s p rin g r e sis ta nce W N
um ber N
am e U
se M
B991502 M
UT-II s u b
a sse m bly M
B991349 S
R S C heck
h arn ess C
heckin g th e S R S e le ctr ic a l c ir c u it r y M
B990803 S
te erin g w heel
p ulle r S
te erin g w heel r e m ova l M
B686560 S
R S a ir b ag a dapt-
e r h arn ess A D
eplo ym ent o f a ir b ag m odule in sid e th e
v e hic le M
B628919 S
R S a ir b ag a dapt-
e r h arn ess B D
eplo ym ent o f a ir b ag m odule o uts id e th e
v e hic le N
am e U
se D
ig it a l m ult i- m ete r C
heckin g th e S R S e le ctr ic a l c ir c u it r y
U se a m ult i- m ete r fo r w hic h th e
m axim um te st c u rre nt is 2 m A o r le ss
a t th e m in im um r a nge o f r e sis ta nce
m easu re m ent

SRS ± Sealant/Troubleshooting52B-6
SEALANT52400060015
ItemSpecified sealantRemark
Sensor cable3M ATD Part No. 8625 or equivalentRibbon sealer
TROUBLESHOOTING52400310097
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 ± How to Use Troubleshooting/Inspection Service Points.
DIAGNOSIS FUNCTION52400320083
DIAGNOSIS CODES CHECK
Connect the MUT-II to the diagnosis connector (16-pin) under the instrument under cover, then check
diagnosis codes.
(Refer to GROUP 00 ± How to Use Troubleshooting/Inspection Service Points.)
ERASING DIAGNOSIS CODES
Refer to GROUP 00 ± How to Use Troubleshooting/Inspection Service Points.
INSPECTION CHART FOR DIAGNOSIS CODES52400330123
Inspect according to the inspection chart that is appropriate for the malfunction code.
Code No.Diagnosis itemReference page
11, 12, 13Front impact sensor system52B-7
21, 22Air bag module (squib) system52B-8
31, 32SDU capacitor system52B-9
33*Cranking signal system52B-10
34*Connector lock system52B-11
41*IG1 (A) power circuit system52B-11
42*IG1 (B) power circuit system52B-12
43SRS warning lamp drive circuit system
Lamp does not illuminate*52B-13
SRS warning lamp drive circuit system
Lamp does not switch off52B-14
44SRS warning lamp drive circuit system52B-14
45SDU non-volatile memory (EEPROM) and A/D converter system52B-14
NOTE
(1) *: If the vehicle condition returns to normal, the diagnosis code will be automatically erased, and the SRS warning
lamp will return to normal.
(2) If the vehicle has a discharged battery it will store the fault codes 41 or 42. When these diagnosis codes are displayed,
check the battery.

P
ro bab le c au se T
ro uble S ym pto m 1
1 1
2 1
3 F
ro nt im pact s e nso r S
hort O
pen c ir c u it
( 1 s e nso r) O
pen c ir c u it
( 2 s e nso rs ) A
ir b ag m odule ( s q uib ) S
hort 1
1 o r 2 1 1
2 o r 2 1 1
3 o r 2 1 O
pen c ir c u it 1
1 o r 2 2 1
2 o r 2 2 1
3 o r 2 2 F
ro nt im pact s e nso r c h eck. ( R efe r to P .5 2B -2 3.) N
G
Rep la ce R
esis ta nce
( 3 W ) S
R S c h eck h arn ess
( M B991349) M
easu re a t S R S c h eck h arn ess c o n-
n ecto r ( 5 ).

Dis co nnect S D U c o nnecto r
C -2 7.

Connect S R S c h eck h arn ess
c o nnecto r ( 3 ).

Resis ta nce b etw een te rm in als
( 1 5) ± ( 1 8)
O K: 2 ,0 00 + 2 0 W

Resis ta nce b etw een te rm in als
( 1 6) ± ( 1 7)
O K: 2 ,0 00 + 2 0 W

Contin uit y b etw een te rm in als 1 5,
1 6, 1 7, 1 8 ± B ody e arth
O K: N o c o ntin uit y N
G C
heck tr o uble s ym pto m . N
G C
heck o r r e pair h arn ess
b etw een S D U a nd f r o nt
i m pact s e nso r. N
G I
n sta ll th e s e nso r h ar-
n ess. O
K O
K C
heck tr o uble s ym pto m . N
G R
epla ce th e S D U.
2
5 41
3

SRS ± Troubleshooting52B-8
Code No. 21 or 22 Air bag module (squib) systemProbable cause
(1) These diagnosis codes are output if there is abnormal resistance between the
input terminals of the air bag module (squib).
The trouble causes for each code No. are as follows. (Refer to chart 1.)
(2) Diagnosis codes 21 and 22 are sometimes generated in combination with
malfunction codes relating to the front impact sensor (code Nos. 11, 12 and 13),
but sometimes only one may be output instead of both being memorized. Because
of this, the front impact sensor should also be inspected at the same time. The
relationships between the codes are as follows. (Refer to chart 2.)
Malfunction of clock spring

Malfunction of wiring harnesses or connectors

Malfunction of air bag module (squib)

Malfunction of SDU
Chart 1
Code No.Trouble Symptom
21
Short in air bag module (squib) or harness short

Short in clock spring

Short in air bag module (squib) or front impact sensor harnesses leading to the power supply
22
Open circuit in air bag module (squib) or open harness

Open circuit in clock spring

Malfunction of connector contact

Short in air bag module (squib) or front impact sensor harnesses leading to the power supply
Chart 2
ItemFront impact sensor
ShortOpen circuit
(1 sensor)Open circuit
(2 sensors)
Air bag module (squib)Short11 or 2112 or 2113 or 21
Open circuit11 or 2212 or 2213 or 22
Caution
Do not attempt to measure the air bag module (squib) circuit resistance. Use of a tester in measuring
the circuit resistance will supply current to the squib, or erroneous deployment due to static electricity
could cause serious injury.

M
UT-II D IA G NO SIS C O DE

Dis co nnect c lo ck s p rin g c o nnec-
t o r C -7 5.

Connect S R S c h eck h arn ess
c o nnecto r ( 1 )

Era se d ia gnosis c o de m em ory
A re c o de N os. 2 1 a nd 2 2 o utp ut? N
o C
lo ck s p rin g c h eck. ( R e-
f e r to P .5 2B -3 2.) N
G
Rep la ce C
heck tr o uble s ym pto m . N
G R
epla ce th e a ir b ag m od-
u le ( s q uib ). S
R S c h eck h arn ess
c o nnecto r
SD U
R esis ta nce
( 3 W )
M B991349 N
o C
heck th e h arn ess w ir e
b etw een th e S D U a nd
c lo ck s p rin g, a nd r e pair
i f n ece ssa ry . Y
es Y
es C
heck th e fr o nt im pact
s e nso r s yste m ( R efe r to
P .5 2B -2 5.) O
K R
epla ce th e S D U.
C ode N o. 3 1 o r 3 2 S D U c ap acit o r s yste m P
ro bab le c au se T
he c a pacit o r in sid e th e S D U is p ro bably d efe ctiv e , s o r e pla ce th e S D U. H ow eve r,
c o de N o. 3 2 c o uld a ls o b e a r e su lt o f a s h ort in th e fr o nt im pact s e nso r, s o in sp ectio n
o f th e fr o nt im pact s e nso r s yste m s h ould a ls o b e c a rrie d o ut. ( R efe r to P . 5 2B -2 5.)

P
ro bab le c au se N
G
1 N
G C
heck tr o uble s ym pto m s. O
K C
heck tr o uble s ym pto m s. O
K M
easu re a t S R S c h eck h arn ess c o nnecto r ( 5 ).

Dis co nnect S D U c o nnecto r

Connect S R S c h eck h arn ess c o nnecto r ( 3 )

Ig nit io n s w it c h O N

Volt a ge b etw een te rm in al ( 1 0) a nd b ody e arth
O K: 0 V O
K R
epla ce th e S D U. N
G C
heck th e h arn ess b etw een th e S D U a nd ig nit io n s w it c h ( S T) < P et-
r o l- p ow ere d v e hic le s> o r S D U a nd s ta rte r r e la y < D ie se l- p ow ere d
v e hic le s> , a nd r e pair if n ece ssa ry . N
G C
heck th e h arn ess w ir e b etw een e ach , S D U a nd e arth ,
a nd r e pair if n ece ssa ry .

P
ro bab le c au se I
s th e S D U e ngagem ent d ete ctio n m ech anis m o pera tin g c o rre ctly ? N
o I
n se rt th e c o nnecto r s e -
c u re ly a nd lo w er th e lo ck
l e ve r to lo ck th e c o nnec-
t o r. Y
es R
epla ce th e S D U.
C ode N o. 4 1 IG
1
( A ) p ow er c ir c u it s yste m P
ro bab le c au se M
easu re a t S R S c h eck h arn ess c o n-
n ecto rs ( 5 ).

Dis co nnect S D U c o nnecto r
C -2 7.

Connect S R S c h eck h arn ess
c o nnecto r ( 3 ).

Contin uit y b etw een te rm in als
( 1 9) ± ( 2 0)
O K: C ontin uit y N
G C
heck tr o uble s ym pto m . N
G C
heck th e h arn ess w ir e b etw een th e S D U a nd e arth ,
a nd r e pair if n ece ssa ry . O
K M
easu re a t S R S c h eck h arn ess c o nnecto r ( 5 ).

Ig nit io n s w it c h O N

Volt a ge b etw een te rm in al ( 1 2) a nd b ody e arth
O K: 9 V o r m ore N
G R
epla ce th e S D U. O
K C
heck tr o uble s ym pto m s. N
G C
heck th e h arn ess b etw een th e S D U a nd ig nit io n s w it c h IG
1
( A ),
a nd r e pair if n ece ssa ry .