1997 MITSUBISHI TRITON Workshop Manual

T
R O UBLE SH O OTIN G 54200900025
T he s p ecia l to ol ( M B991223) s h ould a lw ays b e u se d to m easu re v o lt a ges a nd r e sis ta nce s w hen c a rry in g
o ut tr o uble sh ootin g.
DIA G NO SIS F U NCTIO N
I N PU T S IG NAL IN SPEC TIO N P O IN TS
< V EH IC LE S W IT H E TA CS-E C U>
1 . Connect th e M UT-II to th e d ia gnosis c o nnecto r.
2 . If b uzze r o f th e M UT-II s o unds o nce w hen a s w it c h is
o pera te d ( O N/O FF), th e E TA C S-E C U in put s ig nal fo r th at
s w it c h c ir c u it s yste m is n orm al.
I N SPEC TIO N C HART F O R T R O UBLE S YM PTO M S 54200910042
T ro uble s ym pto m s I
n sp ectio n
p ro ce dure R
efe re nce
p age C
om munic a tio n w it h M UT-II is im possi-
b le . < V ehic le s w it h E TA C S-E C U> C
om munic a tio n w it h a ll s yste m s is
i m possib le . 1 5
4-4 1 C
om munic a tio n w it h o ne-s h ot p uls e in put
s ig nal o nly is im possib le . 2 5
4-4 1 T
he lig htin g m onit o r b uzze r d oesn 't s o und u nder th e fo llo w in g c o ndit io ns w hile ta il
l a m ps o r h eadla m ps illu m in ate .

When th e ig nit io n s w it c h is tu rn ed to O FF a nd th e d riv e r's s id e d oor is o pen. 3 5
4-4 1 H
eadla m p le ve lin g d oes n ot o ccu r w hen th e h eadla m p le ve lin g s w it c h is o pera te d. 5 5
4-4 3 T
he h eadla m ps d o n ot illu m in ate w hen th e v e hic le is in th e fo llo w in g c o ndit io n a nd th e
i g nit io n s w it c h is a t th e O N p osit io n. H ow eve r, th e h eadla m ps illu m in ate w hen th e
l ig htin g s w it c h is m ove d to th e H EAD p osit io n.
< V ehic le s w it h d aytim e r u nnin g la m p s yste m >

Lig htin g s w it c h : O FF

Passin g s w it c h : O FF 6 5
4-4 4 T
he h eadla m ps d o n ot s w it c h o ff w hen th e v e hic le is in th e fo llo w in g c o ndit io n a nd th e
l ig htin g s w it c h is m ove d to th e T A IL p osit io n.
< V ehic le s w it h d aytim e r u nnin g la m p s yste m >

Ig nit io n s w it c h : O FF

Passin g s w it c h : O FF 7 5
4-4 5

CHASSIS ELECTRICAL ± Headlamp54-41
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication with MUT-II is impossible.
(Communication with all systems is impossible.)
Probable cause
The cause is probably a defective power supply system (including earth) for the
diagnosis line.
Malfunction of connector

Malfunction of harness wire
Refer to GROUP 13A ± Troubleshoot-
ing.
Inspection Procedure 2
Communication with MUT-II is impossible. (Communica-
tion with the one-shot pulse input signal only is
impossible.)
Probable cause
The cause is probably a defective one-shot pulse input circuit system of the diagnosis
line.
Malfunction of connector

Malfunction of harness wire

Malfunction of ETACS-ECU
Check the harness wire between the
diagnosis connector and ETACS-ECU.OKCheck the following connectors:
C-35, C-90NG
Repair
NG
RepairOK
Check trouble symptom.NGReplace the ETACS-ECU.
Inspection Procedure 3
The ignition switch is turned to the OFF position and the
driver's side door is opened while the tail lamps or
headlamps are operating, but the light reminder warning
buzzer does not sound.
Probable cause
The cause is probably a defective lighting switch input circuit system or a defective
driver's side door switch input circuit system.
Malfunction of driver's side door switch

Malfunction of harness or connector

Malfunction of buzzer-ECU or ETACS-ECU
Driver's side door switch input circuit
system check
(Refer to Inspection Procedure 4.)
OK
Check the following connectors:
A-55X, C-81, C-91NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between the
junction block and tail lamp relay.OKReplace the buzzer-ECU or ETACS-
ECU.
NG
Repair

CHASSIS ELECTRICAL ± Headlamp54-42
Inspection Procedure 4
Driver's side door switch input circuit system check
Door switch continuity check (Refer to
GROUP 42 ± Door Assembly.)NG
Replace
OK
Door switch earth checkNG
Repair
OK
Disconnect the door switch connector
D-17 and measure at the harness side.

Voltage between the terminal No.
2 and body earth
OK:5 VNGCheck the following connectors:
C-87, C-91, D-17, D-21NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between the
door switch and junction block, and re-
pair if necessary.OK
Check trouble symptom.
NG
Replace the buzzer-ECU or ETACS-
ECU.

CHASSIS ELECTRICAL ± Headlamp54-43
Inspection procedure 5
Headlamp leveling does not occur when the headlamp
leveling switch is operated.
Probable cause
The cause is probably a malfunction of the headlamp leveling switch circuit system
or a malfunction of the headlamp leveling unit circuit system.
If there is a blown fuse, there may also be a short-circuit in a harness.
Malfunction of fuse

Malfunction the headlamp leveling switch

Malfunction of connector

Malfunction of harness wire

Malfunction of the headlamp leveling unit
OK
Check trouble symptoms.NGCheck the harness wire between the
headlamp leveling switch and body
earth. Repair, if necessary.
OK
Check trouble symptoms.NGCheck the harness wire between the
headlamp leveling unit and the head-
lamp leveling relay. Repair, if necessary.
2. NG
OK
Check trouble symptoms.NGCheck the harness wire between the
headlamp leveling switch and the head-
lamp leveling unit (both). Repair, if nec-
essary.
OK
Malfunction of the headlamp leveling
unit.Replace
OK
Check trouble symptoms.NGCheck the harness wire between the
headlamp leveling unit and body earth.
Repair, if necessary.
Check the following connectors:
A-18, A-35NG
Repair
Disconnect the headlamp leveling unit
(LH), headlamp leveling unit (RH) and
headlamp leveling switch connectors
A-18, A-35, C-32 and measure at the
harness side.

Continuity between terminal No. 3
of the headlamp leveling unit (both)
and terminal No. 4 of the headlamp
leveling switch.
OK:ContinuityNGCheck the following connectors:
A-18, A-35, C-32NG
Repair OK
OK
Disconnect the headlamp leveling unit
connectors A-18, A-35 and measure at
the harness side. Both the left and right
connectors of the headlamp leveling unit
should be checked.
1. Voltage between terminal No.1 and
earth
OK:System voltage
2. Continuity between terminal No.2
and earth
OK:Continuity1. NGCheck the following connectors:
A-18, A-35NG
Repair
OK
Disconnect the headlamp leveling
switch connector C-32 and measure at
the harness side.

Continuity between terminal No.3
and earth
OK:ContinuityNGCheck the following connector:
C-32NG
Repair
Headlamp leveling switch check
(Refer to P.54-49.)NG
Replace

CHASSIS ELECTRICAL ± Headlamp54-44
Inspection procedure 6
The headlamps do not illuminate when the vehicle is in the
following condition and the ignition switch is moved to the
ON position. However, they illuminate when the lighting
switch is moved to the HEAD position.


Lighting switch: OFF

Passing switch: OFF
Probable cause
The cause is probably a malfunction of the daytime running lamp control unit (DRL-ECU)
circuit system. If there is a blown fuse, there may also be a short-circuit in a harness.
Malfunction of fuse

Malfunction of connector

Malfunction of harness wire

Malfunction of the DRL relay (1)

Malfunction of the DRL-ECU
DRL relay (1) check
(Refer to P.54-50.)NG
Replace
OK
Disconnect the DRL relay (1) connector
A-12 and measure at the harness side.

Ignition switch: ON
1. Voltage between terminal No.4 and
earth
OK:System voltage
2. Voltage between terminal No.3 and
earth
OK:System voltage when the
lighting switch is at HEAD and
0 V when it is at OFF.
3. Continuity between terminal No.1
and earth
OK:Continuity1. NGCheck the following connectors:
A-12, A-16, C-81, C-88NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL relay (1) and the ignition switch.
Repair, if necessary.
2. NGCheck the following connectors:
A-12, A-16, A-20, A-34NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL relay (1) and the headlamp. Repair,
if necessary.
3. NGCheck the following connectors:
A-12, A-19NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL relay (1) and the body earth. Repair,
if necessary.OK
Malfunction of the DRL-ECU
Replace

CHASSIS ELECTRICAL ± Headlamp54-45
Inspection procedure 7
The headlamps do not switch off when the vehicle is in the
following condition and the lighting switch is moved to the
TAIL position.


Ignition switch: OFF

Passing switch: OFF
Probable cause
The cause is probably a malfunction of the daytime running lamp control unit (DRL-ECU)
circuit system. If there is a blown fuse, there may also be a short-circuit in a harness.
Malfunction of fuse

Malfunction of connector

Malfunction of harness wire

Malfunction of the tail lamp relay

Malfunction of the DRL-ECU
Lighting switch check
(Refer to P.54-49.)NG
Replace
OK
Disconnect DRL-ECU connector A-10
and measure at the harness side.

Continuity between terminal No.10
and earth
OK:ContinuityNGCheck the following connectors:
A-10, A-19NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL-ECU and the body earth. Repair,
if necessary.
OK
Tail lamp relay check
(Refer to P.54-49.)NG
Replace
OK
Disconnect the DRL-ECU connector
A-10 and measure at the harness side.

Voltage between terminal No.5 and
earth
OK: System voltageNGCheck the following connectors:
A-10, A-16, A-55XNG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL-ECU and the fusible link No.3. Re-
pair, if necessary.OK
Malfunction of the DRL-ECU
Replace

O
N-V EH IC LE S ER VIC E 5420009011 1
H EA DLA M P A IM IN G
< U SIN G A B EA M SETTIN G E Q UIP M EN T>
1 . The h eadla m ps s h ould b e a im ed w it h th e p ro per
b eam se ttin g e quip m ent, a nd in a cco rd ance w it h th e
e quip m ent m anufa ctu re 's in str u ctio ns.
N O TE
I f th ere a re a ny r e gula tio ns p ertin ent to th e a im in g o f
h eadla m ps in th e a re a w here th e v e hic le is to b e u se d,
a dju st s o a s to m eet th ose r e quir e m ents .
2 . Alt e rn ate ly tu rn th e a dju stin g s cre w to a dju st th e h eadla m p
a im in g.
< U SIN G A S C REEN >
1 . In fla te th e ty re s to th e s p ecif ie d p re ssu re s a nd th ere
s h ould b e n o o th er lo ad in th e v e hic le s o th er th an d riv e r
o r s u bstit u te d w eig ht o f a ppro xim ate ly 7 5 k g p la ce d in
d riv e r's p osit io n.
2 . Set th e d is ta nce b etw een th e s cre en a nd th e c e ntr e o f
t h e h eadla m ps a s s h ow n in th e illu str a tio n.
3 . Check if th e b eam s h in in g o nto th e s cre en is a t th e
s ta ndard v a lu e.
S ta n dard v alu e:
( V ertic al d ir e ctio n)
6 0 m m b elo w h oriz o nta l ( H )
( H oriz o nta l d ir e ctio n)
P osit io n w here t h e 1 5
s lo pin g s ectio n
i n te rs ects t h e v ertic al lin e ( V )
4 . Alt e rn ate ly tu rn th e a dju stin g s cre w to a dju st th e h eadla m p
a im in g.
C au tio n
B e s u re t o a d ju st t h e a im in g a d ju stm en t s cre w i n
t h e t ig hte n in g d ir e ctio n. 7
8 m m L
am p c e ntr e S
cre en 5
m D
is ta nce o f
v e rtic a l d ir e ctio n L
am p c e ntr e 1
55 V
ertic a l d ir e ctio n
a dju stin g s cre w H
oriz o nta l
d ir e ctio n
a dju stin g
s cre w

S
prin g