key MITSUBISHI TRITON 1997 Workshop Manual

MPI ± Troubleshooting13A-20
Code No.54 Immobilizer systemProbable cause
Range of Check

Ignition switch: ON
Set Conditions

Improper communication between the engine-ECU and immobilizer-ECU
Radio interference of ID codes

Incorrect ID code

Malfunction of harness or connector

Malfunction of immobilizer-ECU

Malfunction of engine-ECU
NOTE
(1) If the ignition switches are close each other when starting the engine, radio interference may cause
this code to be displayed.
(2) This code may be displayed when registering the key ID code.
No
Is there another ignition key near the ignition key that is inserted
in the ignition switch?Ye sRemove the extra ignition key.
NGCheck trouble symptom.
Is a diagnosis code output from the immobilizer-ECU?Ye sCheck the immobilizer system. (Refer to GROUP 54 ± Ignition
Switch and Immobilizer System.)
No
Check the following connectors.
C-19, C-36, C-50NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and the immobiliz-
er-ECU.OKReplace the immobilizer-ECU.
NG
Check trouble symptom.NG
RepairNG
Replace the engine-ECU.

MPI ± Troubleshooting13A-24
INSPECTION PROCEDURE 2
MUT-II communication with engine-ECU is impossible.
Probable cause
One of the following causes may be suspected.

No power supply to engine-ECU.

Defective earth circuit of engine-ECU.

Defective engine-ECU.

Improper communication line between engine-ECU and MUT-II

Malfunction of engine-ECU power supply circuit

Malfunction of engine-ECU

Open circuit between engine-ECU and diagnosis
connector


Malfunction of engine-ECU power supply circuit

Malfunction of engine-ECU

Malfunction of immobilizer-ECU

Open circuit between immobilizer-ECU and diagnosis
connector

Open circuit between engine-ECU and immobilizer-
ECU
OK
Ye s
NG

Check the following connector. C-19NG
Repair
Check trouble symptom.
NG
Check the harness wire between engine-ECU and diagnosis con-
nector.OKCheck the harness wire
between engine-ECU and
earth.NG
Repair
OK
Check the power supply and ignition switch-IG system. (Refer to
P.13A-39, INSPECTION PROCEDURE 23.)

Repair
OKCheck the harness wire
between engine-ECU and
earth.NG
Repair
OK
Check the power supply and ignition switch-IG system. (Refer to
P.13A-39, INSPECTION PROCEDURE 23.)
NG
Check the harness wire between engine-ECU and immobilizer-
ECU.
OK
Check trouble symptom.
Check the following connectors. C-19, C-36NG
Repair
Is communication possible between the MUT-II and the immobilizer-
ECU?NoCheck the diagnosis line between the immobilizer-ECU and the
MUT-II, and repair if necessary. (Refer to GROUP 54 ± Ignition
Key and Immobilizer.)
NG
Repair

MPI ± Troubleshooting13A-26
INSPECTION PROCEDURE 5
No initial combustion (starting impossible)
Probable cause
In cases such as the above, the cause is probably that a spark plug is defective,
or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.
Malfunction of the ignition system

Malfunction of the fuel pump system

Malfunction of the injectors

Malfunction of the engine-ECU

Malfunction of the immobilizer system with immobilizer system>

Foreign materials in fuel
Check battery voltage when cranking.
OK:8 V or higherNGCheck the battery. (Refer to GROUP 54 ± Battery.)
OK
Is immobilizer-ECU diagnosis code displayed? immobilizer system>Ye sCheck the immobilizer.
(Refer to GROUP 54 ± Ignition Key and Immobilizer.)
No
MUT-II: Inspection of no initial combustion.
(Refer to P.13A-47, INSPECTION PROCEDURE 34.)
OK
Can any sound be heard from the injectors when cranking?NGCheck the injector system. (Refer to P.13A-19, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE 41.)
OK
Ignition system: Inspection of no initial combustion.
(Refer to P.13A-47, INSPECTION PROCEDURE 35.)
OK
Check the following items.

Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 ± On-vehicle service.)

Check if the injectors are clogged.

Check if foreign materials (water, alcohol, etc.) got into fuel.

Check the compression pressure.

Check the immobilizer system. (Refer to GROUP 54 ± Ignition Key and Immobilizer.)

ABS <2WD> ± Troubleshooting35B-14
INSPECTION CHART FOR TROUBLE SYMPTOMS35201140142
Get an understanding of the trouble symptoms and check according to the inspection procedure chart.
Trouble symptomsInspection
procedure No.Reference
page
Communication with MUT-II
is notpossible
Communication with all systems is not possible.135B-15
is not ossible.
Communication with ABS only is not possible.235B-15
When the ignition key is turned to ªONº (engine stopped), the ABS warning lamp does
not illuminate.335B-16
After the engine starts, the ABS warning lamp remains illuminated.435B-16
When the ignition key is turned to ªSTARTº, the ABS warning lamp does not illuminate.535B-17
After the ignition key is turned to ªONº, the ABS warning lamp blinks twice, and when
turned to ªSTARTº, it illuminates. When returned to ªONº, the lamp flashes once, and
then switches off.635B-17
Faulty ABS operationUnequal braking power on both sides735B-18
Insufficient braking power
ABS operates under normal braking conditions
ABS operates before vehicle stops under normal
braking conditions
Large brake pedal vibration (Caution 2.)±±
Caution
1. If steering movements are made when driving at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of this, when getting information from the customer,
check if the problem occurred while driving under such conditions as these.
2. During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such
phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent
the wheels from locking and is not an abnormality.

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 <2WD> ± Troubleshooting35B-17
Inspection Procedure 5
When ignition key is turned to ºSTARTº, ABS warning
lamp does not illuminate.
Probable cause
Current does not flow in the ABS-ECU when the ignition switch is turned to START.
Current flows in the ABS warning lamp even when the ignition switch is turned to
START. Therefore, the valve relay, which current is supplied through the ABS-ECU,
turns off when the ignition switch is at START. However, the warning lamp circuit
of the valve relay must turn on in turn. So the cause must be a defective circuit
on valve relay side.
Malfunction of wiring harness or connector

Malfunction of ABS-ECU
ABS valve relay check (Refer to
P.35B-28.)NGReplace the ABS valve relay.
OK

Disconnect valve relay connector
A-39.

Disconnect ABS-ECU connector
C-64.

Ignition switch: ON

Voltage between valve relay
harness-side connector terminal (3)
and body earth
OK:System voltageNGCheck the following connector and
diode.
C-02 and C-05NG
Repair
OK
Check trouble symptoms.NGCheck the harness between the com-
bination meter and valve relay, and re-
pair if necessary.
OK
Check the following connector.
A-39NG
Repair
OK
Check trouble symptoms.NGCheck the harness between the valve
relay and earth, and repair if necessary.
Inspection Procedure 6
The ABS warning lamp flashes twice after the ignition key
is turned to ºONº. The lamp illuminates when the ignition
key is turned to ºSTARTº, and when the key is returned to
ºONº, it flashes once.
Probable cause
The ABS-ECU causes the ABS warning lamp to illuminate during the initial check
(approx. 3 seconds). During the initial check, the valve relay turns from off to on,
off and back to on again. If there is an open circuit in the harness between the ABS-ECU
and the ABS warning lamp, the lamp will illuminate only when the valve relay is OFF
during valve relay test, etc.
Malfunction of wiring harness or connector

Malfunction of ABS-ECU

Disconnect valve relay connector
A-39.

Disconnect ABS-ECU connector
C-64.

Ignition switch: ON

Voltage between ABS-ECU har-
ness-side connector terminal (50)
and body earth
OK:System voltageNGCheck the following connector.
C-02NG
Repair
OK
Check trouble symptom.NGCheck the harness between the com-
bination meter and the ABS-ECU, and
repair if necessary.
OK
Check the following connector.
C-64NG
Repair
OK
Check trouble symptom.NGReplace the ABS-ECU.

BODY ± Door42-28
Inspection Procedure 10
None of the doors lock or unlock when the driver's-side
inside door locking knob is operated (including by means
of the door key).
Probable cause
The cause may be a malfunction of the door lock actuator switch, the ETACS-ECU
or of a wiring harness or connector.
Malfunction of front door lock actuator (driver's side)

Malfunction of ETACS-ECU

Malfunction of wiring harness or connector
MUT-II Pulse check
Front door lock actuator switch (driver's-
side) input signal
OK:The MUT-II buzzer sounds once
when the front door lock actuator
moves from the locked to the un-
locked position, or from the un-
locked to the locked position.NGDoor lock actuator check (driver's side).
(Refer to P.42-41.)NG
Replace
OK
Check the following connectors:
C-38, C-90, E-09NG
Repair
OK
Check trouble symptoms.OK
Replace the ETACS-ECU.NG
Check the harness wire between the
front door lock actuator (driver's side)
and ETACS-ECU, between front door
lock actuator and the earth, and repair
if necessary.
Inspection Procedure 11
Some doors do not lock or unlock.
Probable cause
The cause may be a malfunction of the door lock actuator or of a wiring harness
or connector.
Malfunction of door lock actuator

Malfunction of wiring harness or connector
Check the door lock actuator of the door that does not operate.
(Refer to P.42-41, 42.)NG
Replace
OK
Check the following connectors:
C-38, C-90, E-09
C-18, C-90, E-20
C-90, D-15, D-22, E-05
C-90, D-05, D-22, E-16OKCheck trouble symptoms.
NG
Check the harness between the ETACS-ECU and the door lock
actuator of the door that does not operate, and repair if necessary.
NG
Repair

SRS ± Troubleshooting52B-14
Code No.43 SRS warning lamp drive circuit system
(Lamp does not switch off.)Probable cause
This diagnosis code is output when a short to earth occurs in the harness between
the lamp and the SDU while SDU is monitoring the SRS warning lamp and the lamp
is ON.
Malfunction of wiring harnesses or connectors

Malfunction of SDU

Malfunction of combination meter
SRS warning lamp inspection

Ignition switch: ON

Does lamp switch off when SDU connector C-27 is
disconnected?NoCheck the following
connectos:
C-06, C-27NG
Repair
Ye s
Replace the SDU.
OK
Check trouble symptoms.
NG
Check the harness wire
between the SDU and
combination meter, and
repair if necessary.
Code No.44 SRS warning lamp drive circuit systemProbable cause
This diagnosis code is output when a short occurs in the lamp drive circuit or a
malfunction of the output transistor inside the SDU is detected while the SDU is
monitoring the SRS warning lamp drive circuit.
Malfunction of wiring harnesses or connectors

Malfunction of SDU
Check the SRS warning lamp drive circuit system.
(Refer to P.52B-13.)OKReplace the SDU.
Code No.45 SDU non-volatile memory (EEPROM) and A/D
converter systemProbable cause
This diagnosis code is output if there is a malfunction in the SDU non-volatile memory
(EEPROM) and A/D converter.
Malfunction of SDU
Replace the SDU.
INSPECTION CHART FOR TROUBLE SYMPTOMS52400340126
Get an understanding of the trouble symptoms and check according to the inspection procedure chart.
Trouble symptomInspection procedure No.Reference page
Communication with
MUT-II is not possible.Communication with all systems is not
possible.152B-15
Communication is not possible with
SRS only.252B-15
When the ignition key is turned to ªONº (engine stopped), the
SRS warning lamp does not illuminate.Refer to diagnosis code No.43.52B-13
After the ignition switch is turned to ON, the SRS warning lamp
is still on after approximately 7 seconds have passed.Refer to diagnosis code No.43.52B-14

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-8
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 junction block.OKCheck the following connectors:
C-35, C-90NG
Repair
OK
Check trouble symptoms.NGReplace the ETACS-ECU.
NG
Repair
Inspection Procedure 3
Even if the driver's side door is opened, the key hole
illumination lamp does not illuminate.
Probable cause
The cause is probably a defective key hole illumination lamp circuit system or a defective
driver's side door switch input circuit system.
Malfunction of driver's side door switch

Malfunction of key hole illumination lamp

Malfunction of harness or connector

Malfunction of ETACS-ECU
Driver's side door switch input circuit
system check (Refer to Inspection Pro-
cedure 5 on P.54-9.)
OK
Key hole illumination lamp check
(Refer to P.54-22.)NG
Replace
OK
Disconnect the key reminder switch
connector C-72 and measure at the har-
ness side.

Voltage between the terminal No.1
and body earth
OK:System voltageOKCheck the following connectors:
C-72, C-86, C-91NG
Repair
OK
Check trouble symptom.
NGNG
Check the following connectors:
C-72, C-79NG
Repair
OK
Check trouble symptom.
NG
Check the harness between the key re-
minder switch and junction block, and
repair if necessary.
Check the harness between the key re-
minder switch and junction block, and
repair if necessary.OKReplace the ETACS-ECU.
NG
Repair

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-9
Inspection Procedure 4
Key hole illumination lamp remains illuminated.
Probable cause
The cause is probably a short harness or a defective ETACS-ECU.
Malfunction of harness

Malfunction of ETACS-ECU
When the connector C-86 of the junction block is disconnected,
does the lamp switch off?NoCheck the harness between the key reminder switch and junction
block, and repair if necessary.
Ye s
Replace the ETACS-ECU.
Inspection Procedure 5
Driver's side door switch input circuit system check
Door switch 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, D-17, D-21NG
Repair
OK
Replace the ETACS-ECU.
OK
Check trouble symptom.NGCheck the harness between the door
switch and junction block, and repair
if necessary.