fuse MITSUBISHI TRITON 1997 Workshop Manual

GENERAL ± How to Use Troubleshooting/Inspection Service Points00-9
HOW TO USE THE INSPECTION PROCEDURES
The causes of a high frequency of problems occurring in electronic circuitry are generally the connectors,
components, the ECU and the harnesses between connectors, in that order. These inspection procedures
follow this order, and they first try to discover a problem with a connector or a defective component.

Indicator does not turn on or off even if control
mode switch is pressed.

Indicator switch should not be illuminated is
illuminated.Probable cause
OK
OK
OK
Measure at switch connector A-44

Disconnect the connector, and measure at the harness
side.

Voltage between terminal 6 ± earth and terminal 8 ±
earth
OK:Approx. 5V
OK
NG
Check the following connector. A-44
Repair
OK
Check trouble symptom.
Replace the ECS-ECU.
In the above cases, the ECS switch circuit is defective or the indicator
circuit is defective.
CHECKING PROCEDURE 4
2. Indicates inspection carried out using the
MUT-II.
Indicates the operation and inspection proce-
dures.
Indicates the OK judgement conditions.
3. Detailed inspection procedures (methods)
such as component inspection and circuit
inspection are listed on a separate page, and
are given here for reference.
5. Inspect the contact condition at each connector terminal.
(Refer to Connector Inspection Service Points.)
The connector position can be located in the wiring diagram in the
electrical wiring manual by means of this symbol.
Caution
After carrying out connector inspection, always be sure to
reconnect the connector as it was before.
6. Confirm that there are trouble symptoms. If trouble symptoms have
disappeared, the connector may have been inserted incorrectly and the
trouble symptom may have disappeared during inspection.
If it seems that trouble symptoms still remain, proceed to the next page of
instructions.
7. If trouble symptoms still remain up to this stage, there is a possibility that there is an
open or short circuit in the harness between the connectors, so check the harness.
Alternatively, the cause may be a defective ECU, so try replacing the ECU and check
if the trouble symptom disappears.
NGECU switch component inspection (Refer to P.3-44.)
NG
1. Comments on the diagnosis code or trouble
symptom above.
MUT-II Data list
17 Control mode selection switch
OK:Voltage changes between approx. 0V
approx.
2.5V
approx. 5V when the switch is operated.
4. Indicates voltage and resistance to be measured at a particular
connector.
(Refer to Connector Measurement Service Points.)
The connector position can be located in the wiring diagram in the
electrical wiring manual by means of this symbol.
Indicates operation and inspection procedures, inspection terminals
and inspection conditions.
Indicates the OK judgement conditions.
HARNESS INSPECTION
Check for an open or short circuit in the harness between the terminals which were defective according
to the connector measurements. Carry out this inspection while referring to the electrical wiring manual.
Here, ªCheck harness between power supply and terminal xxº also includes checking for blown fuses.
For inspection service points when there is a blown fuse, refer to ªInspection Service Points for a Blown
Fuse.º
MEASURES TO TAKE AFTER REPLACING THE ECU
If the trouble symptoms have not disappeared even after replacing the ECU, repeat the inspection procedure
from the beginning.

GENERAL ± Supplemental Restraint System (SRS)00-31
Harness connector
(No. of terminals,
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 harness
10Body 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* installa-
tion procedures
(Refer to GROUP 52B )16Body wiring harness
Front wiring harness

Front impact sensor (+) (L.H.)(Refer to GROUP 52B.)
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 braking 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 GROUP 52B ± SRS Maintenance.)
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.

ABS <2WD> ± Troubleshooting35B-9
Code No. 33 Stop lamp switch systemProbable cause
These codes are output at the following times:

When the stop lamp switch is not be turned off (when the stop lamp switch stays
on for 15 minutes or more although the ABS is not operating)

When the ABS-ECU determines that there is an open circuit in harness of the
stop lamp switch system.
Malfunction of stop lamp switch

Malfunction of harness or connector

Malfunction of ABS-ECU
OK
Check trouble symptom.
NG
Check the harness between dedicated
fuse No. 8 and the ABS-ECU, and repair
if necessary.
OK
Check the harness between dedicated
fuse No. 8 and the ABS-ECU, and repair
if necessary.
OK
Stop lamp switch check. (Refer to
GROUP 35A ± On-vehicle Service.)NGReplace the stop lamp switch.
OK
Check trouble symptom.NGReplace the ABS-ECU.
Does the stop lamp illuminate and switch
off normally?NoStop lamp switch installation check.NG
Repair
Ye s
Measure at ABS-ECU connector C-64.

Disconnect the connector and
measure at the harness side.

Stop lamp switch ON.

Voltage between 34 and body earth
OK:System voltageNGCheck the following connectors.
C-82, C-89, C-34 and C-02NG
Repair
OK
Check the following connector.
C-64NG
Repair

ABS <2WD> ± Troubleshooting35B-15
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication with MUT-II is not possible.
(Communication with all systems is not possible.)
Probable cause
The reason is probably a defect in the power supply system (including earth) for
the diagnosis line.
Malfunction of connector

Malfunction of harness
Refer to GROUP 13A ± Troubleshooting.
Inspection Procedure 2
Communication with MUT-II is not possible.
(Communication with ABS only is not possible.)
Probable cause
When communication with the MUT-II is not possible, the cause is probably an open
circuit in the ABS-ECU power circuit or an open circuit in the diagnosis output circuit.
Blown fuse

Malfunction of wiring harness or connecter

Malfunction of ABS-ECU
OK
Check trouble symptoms.NGReplace the ABS-ECU.
OK
Check the following connectors.
C-62 and C-64NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
ignition switch and the ABS-ECU, and
repair if necessary.
OK
Measure at ABS-ECU connectors C-62
and C-64

Disconnect the connector and
measure at the harness side.

Continuity between 4, 15, 16, 25
(C-62), 42 (C-64) ± body earth
OK:ContinuityNG
OK
Measure at ABS-ECU connector C-62

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Voltage between 13 ± body earth
OK:System voltageNGCheck the following connectors.
C-88, C-86 and C-02NG
Repair
OK
Check trouble symptoms.NGCheck the harness between the ABS-
ECU and diagnosis connector, and re-
pair if necessary.
Measure at diagnosis connector C-35
and ABS-ECU connector C-64

Disconnect the connector and
measure at the harness side.

Continuity between the following
terminals
OK:Continuity
ABS-ECU side
Diagnosis connector sideNGCheck the following connector.
C-02NG
Repair
Repair 47
1367

ABS <2WD> ± Troubleshooting35B-16
Inspection Procedure 3
When ignition key is turned to ºONº (engine stopped),
ABS warning lamp does not illuminate.
Probable cause
When current flows in the ABS-ECU, the valve relay turns from off to on, off and
back to on again as the initial check. So the ABS warning lamp will illuminate twice
when the valve relay is off even if there is a problem with the circuit between the
ABS warning lamp and the ABS-ECU.
Therefore, if the lamp does not illuminate, the cause may be: an open circuit in the
lamp power supply circuit, a blown lamp bulb, an open circuit in both the circuit between
the ABS warning lamp and the ABS-ECU and in the circuit between the ABS warning
lamp and the valve relay.
Blown fuse

Burnt out ABS warning lamp bulb

Malfunction of wiring harness or connector
OK
Check trouble symptoms.NGReplace the combination meter. NG
Repair
OK
Check the following connectors.
C-88, C-79, C-06, C-05 and C-02
OK
Check the harnesses between the valve
relay and connector C-02 and between
the ABS-ECU and connector C-02. Re-
pair if necessary.
OK
Measure at connector C-02:

Disconnect the connector and
measure at the male pin.

Ignition switch: ON

Does the ABS warning lamp
illuminate when terminal (3) is
earthed?
OK:IlluminatesNGCheck whether the ABS warning lamp
bulb is burnt out.NGReplace the ABS warning lamp bulb.
Fuse inspection, Multi-purpose fuse No.
11NGRefer to GROUP 00 ± Inspection Ser-
vice Points for a Blown Fuse.
Inspection Procedure 4
Even after the engine is started, the ABS warning lamp
remains illuminated.
Probable cause
The cause is probably a short-circuit in the ABS warning lamp illumination circuit.
Malfunction of combination meter

Malfunction of ABS-ECU

Malfunction of wiring harness
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.
No
Check the harnesses between the combination meter and the ABS-
ECU and between the combination meter and the valve relay. Repair,
if necessary.
No

Disconnect ABS-ECU connector C-64.

Disconnect valve relay connector A-39.

Ignition switch: ON

Does the ABS warning lamp switch off?Ye sReplace the ABS-ECU.
Disconnect connector C-02 and turn the ignition switch to ON.

Does the ABS warning lamp remain illuminated?Ye sReplace the combination meter.

ABS <4WD> ± Troubleshooting35C-9
Code No. 27 Rear differential lock detection switch
Probable cause
The ABS-ECU determines that an open circuit occurs in rear differential detection
switch system.
Malfunction of wiring harness or connector

Malfunction of rear differential lock-ECU

Malfunction of ABS-ECU
Does the 4WD indicator lamp (rear dif-
ferential lamp) operate normally?NoRear differential lock-ECU check.NGReplace the rear differential lock-ECU.
Ye s
Measure at the ABS-ECU connector
C-64.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Rear differential lock switch: OFF

Voltage between 46 and body earth
OK:System voltageNGCheck the following connectors.
C-88, C-86, C-02 and C-64NG
Repair
OK
Check trouble symptom.NGCheck the harness between rear differ-
ential detection switch and the ABS-
ECU, and repair if necessary.
OK
Check the following connector.
C-64NG
Repair
OK
Check trouble symptoms.NGReplace the ABS-ECU.
Code No. 27 Rear differential lock detection switch
Probable cause
For vehicles without rear differential lock, battery positive voltage is applied to the
ABS-ECU terminal No. 46.
This code is output when this line is interrupted.
Malfunction of wiring harness or connector

Malfunction of ABS-ECU
Is the fuse No. 7 normal?NoReplace the fuse after eliminating the
cause of the blowout.
Ye s
Measure at the ABS-ECU connector
C-64.

Disconnect the connector and
measure at the harness side.

Ignition switch ON

Voltage between 46 and body earth
OK:System voltageNGCheck the following connectors.
C-88, C-86, C-02 and C-64NG
Repair
OK
Check trouble symptoms.NGCheck the harness between fuse No.
7 inside the junction block and the ABS-
ECU, and repair if necessary.
OK
Check the following connector.
C-64NG
Repair
OK
Check trouble symptoms.NGReplace the ABS-ECU.

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.

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