reset MITSUBISHI TRITON 1997 Workshop Manual

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-10
Immobilizer System
Caution
1. The ID code should always be re-registered when replacing the immobilizer-ECU. vehicles>
2. If the immobilizer-ECU has been replaced, you will need to re-register the ignition key ID codes
and to reset the code for the fuel cut valve controller to the factory setting. vehicles>
3. If the immobilizer-ECU has been replaced with a new part, the password (vehicle secret code)
which has been stored in the immobilizer-ECU for each vehicle will be replaced by the password
(secret code) specified by the customer.
STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING54300690024
Refer to GROUP 00 ± How To Use Troubleshooting/Inspection Service Points.
DIAGNOSIS FUNCTION54300700116
DIAGNOSIS CODES CHECK
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.
Caution
The diagnosis codes which result from disconnecting the battery cables cannot be erased.
INSPECTION CHART FOR DIAGNOSIS CODES

54300710027
Diagnosis code No.Inspection itemsReference
page
11Transponder communication system or radio interference of ID code54-11
12*ID code are not the same or are not registered54-11
21Communication system between MUT-II and engine-ECU54-12
31EEPROM abnormality inside immobilizer-ECU54-12
NOTE
*: Diagnosis code No. 12 is not recorded.

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-13
INSPECTION CHART FOR DIAGNOSIS CODES

54300710034
Diagnosis code No.Inspection itemsReference page
11Transponder communication system or radio interference of ID
code54-11
12*ID codes are not the same or not registered54-11
21Communication system between fuel cut valve controller and
immobilizer-ECU54-13
22Malfunction of fuel cut valve controller system54-14
23Identification codes are not identical54-14
31EEPROM abnormality inside immobilizer-ECU54-12
NOTE
*: diagnosis code No.12 is recorded.
INSPECTION PROCEDURE FOR DIAGNOSIS CODES

For diagnosis code numbers other than those listed below, refer to ªPETROL-POWERED VEHICLESº.
Code No.21 Communication system between fuel cut
valve controller and immobilizer-ECU
Probable cause
The confirmation code is not sent from the fuel cut valve controller within the specified
time after the ignition key is turned to ON or, an incorrect code is sent.
Malfunction of harness or connector

Malfunction of fuel cut valve controller

Malfunction of immobilizer-ECU
Check the following connectors: A-90, C-19, C-36NG
Repair
OK
Check trouble symptom.
NG
Check the harness between the immobilizer-ECU and fuel cut valve
controller.NG
Repair
OK
Check the fuel cut valve controller power source and earth circuit.
(Refer to P.54-17, Inspection Procedure 6.)NG
Repair
OK
Check trouble symptom.NGReplace the immobilizer-ECU.
Register the password (secret code), reset the code to the factory
setting and register the ID code. (Refer to P.54-23.)
Check trouble symptom.
NG
Replace the fuel cut valve controller (fuel injection pump assembly).

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-14
Code No.22 Malfunction of fuel cut valve controller
systemProbable cause
The cause is probably a malfunction of the fuel cut valve controller.
Malfunction of fuel cut valve controller
Check the fuel cut valve controller power source and earth circuit.
(Refer to P.54-17, Inspection Procedure 6.)
OK
Check trouble symptom.NGReplace the fuel cut valve controller (fuel injection pump assembly).
Code No.23 Identification codes are not identicalProbable cause
The identification code received from the immobilizer-ECU is not identical to the
identification code that has been recorded in the fuel cut valve controller.
Resetting the code to the factory setting is not made
using the MUT-II

Malfunction of fuel cut valve controller
Use the MUT-II to reset the code to the factory setting.
(Refer to P.54-23.)
Check trouble symptom.NGReplace the fuel cut valve controller (fuel injection pump assembly).
Check trouble symptom.
NG
Replace the immobilizer-ECU.
Register the password (secret code), reset the code to the factory
setting and register the ID code. (Refer to P.54-23.)
INSPECTION CHART FOR TROUBLE SYMPTOMS54300720242
Trouble symptomInspection procedure No.Reference page
Communication with MUT-II is impossible154-15
ID code cannot be registered using the MUT-II254-15
Engine does not start (Cranking but no initial combustion).
354-16
Engine does not start (Cranking but no initial combustion).
454-16
Malfunction of the immobilizer-ECU power source and
earth circuit554-17
Malfunction of the fuel cut valve controller power source
and earth circuit 654-17

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-15
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication with MUT-II is impossible
Probable cause
The cause is probably that a malfunction of the diagnosis line or the immobilizer-ECU
ia not functioning.
Malfunction of diagnosis line

Malfunction of harness or connector

Malfunction of immobilizer
Ye sOK
Check trouble symptom.
NG
OK
Check trouble symptom.NG
Check the harness between the immobi-
lizer-ECU and diagnosis connector.NG
Repair
OK
Check the immobilizer-ECU power sup-
ply and earth circuit. (Refer to P.54-17,
Inspection Procedure 5.)
OK
Check trouble symptom.NGReplace the immobilizer-ECU.

Register the password (secret code)
and the ID code. (Refer to P.54-23.)

Register the password (secret code),
reset the code to the factory setting and
register the ID code. (Refer to P.54-23.)
Check the immobilizer-ECU connector
C-36.
(Short-circuited harness wire between
terminal No.14 and No.15)NG
Repair
Can the MUT-II communicate with the
engine-ECU?NoCheck the following connectors:
C-35, C-36NG
Repair
Inspection Procedure 2
ID code cannot be registered using the MUT-II
Probable cause
The cause is probably that there is no ID code registered in the immobilizer-ECU
or there is a malfunction of the immobilizer-ECU.
Malfunction of transponder

Malfunction of ignition key ring antenna

Malfunction of harness or connector

Malfunction of immobilizer-ECU
No ignition key can be registered.NoReplace the ignition key that cannot be
registered.Re-register the ID code.
(Refer to P.54-23.)
Ye s
Is a diagnosis code displayed?Ye sTo INSPECTION CHART FOR DIAG-
NOSIS CODE. (Refer to P.54-10, 13.)
No
Check the immobilizer-ECU power
source and the earth circuit. (Refer to
P.54-17, Inspection Procedure 5.)OKCheck trouble symptom.NGReplace the immobilizer-ECU.

Register the password (secret code)
and the ID code. (Refer to P.54-23.)

Register the password (secret code),
reset the code to the factory setting and
register the ID code. (Refer to P.54-23.)

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-16
Inspection Procedure 3
Engine does not start (Cranking but no initial combus-
tion).
Probable cause
If the fuel injectors are not operating, there might be a problem with the MPI system
in addition to a malfunction of the immobilizer system.
It is normal for this to occur if an attempt is made to start the engine using a key
that has not been properly registered.
Malfunction of MPI system

Malfunction of immobilizer-ECU
Check the system voltage during crank-
ing
OK:8 V or moreNGCheck the battery.
OK
Is a diagnosis code displayed from the
immobilizer-ECU?Ye sTo INSPECTION CHART FOR DIAG-
NOSIS CODE. (Refer to P.54-10.)
No
Is a diagnosis code displayed from the
engine-ECU?Ye sRefer to GROUP 13A ± Troubleshoot-
ing.
No
Check the starting system. (Refer to
GROUP 13A ± Troubleshooting.)
OK
Check trouble symptom.
NG
Check the immobilizer-ECU power
source and the earth circuit. (Refer to
P.54-17, Inspection Procedure 5.)OKCheck trouble symptom.NGReplace the immobilizer-ECU.
Register the password (secret code)
and the ID code. (Refer to P.54-23.)
Inspection Procedure 4
Engine does not start (Cranking but no initial combus-
tion).
Probable cause
If no fuel injection, there might be a problem with the fuel injection system in addition
to a malfunction of the immobilizer system.
It is normal for this to occur if an attempt is made to start the engine using a key
that has not been properly registered.
Malfunction of diesel fuel injection system

Malfunction of immobilizer-ECU
Check the system voltage during crank-
ing
OK:8 V or moreNGCheck the battery.
OK
Is a diagnosis code displayed from the
immobilizer-ECU?Ye sTo INSPECTION CHART FOR DIAG-
NOSIS CODE. (Refer to P.54-13.)
No
Check the diesel fuel injection system.
(Refer to GROUP 13E ± On-vehicle Ser-
vice.)
OK
Check the immobilizer-ECU power sup-
ply and the earth circuit. (Refer to
P.54-17, Inspection Procedure 5.)OKCheck trouble symptom.NGReplace the immobilizer-ECU.
Register the password (secret code),
reset the code to the factory setting and
register the ID code. (Refer to P.54-23.)
Check trouble symptom.
NG
Replace the fuel cut valve controller
(fuel injection pump assembly).

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-24
3. Use the ignition key that is to be registered to turn on
the ignition switch.
4. Use the MUT-II to register the ID code. If you are
registering two or more codes, use the next key to the
registered to turn on the ignition switch without
disconnecting the MUT-II.
5. Disconnect the MUT-II. This complete the registration
operation.
6. Check that the engine can be started with each of the
ignition keys.
7. Check the diagnosis output from the engine-ECU, and
erase code No.54 if it appears.
Resetting the code to the factory setting

Refer to the MUT-II INSTRUCTION MANUAL on handling
the MUT-II.
NOTE
Resetting the code to the factory setting refers to the process
of clearing the identification code which has been recorded
in the fuel cut valve controller and switching the controller
to learning mode. After this resetting is carried out, the
identification code in the immobilizer-ECU will be recorded
in the controller the next time the ignition switch is turned
to the ON.
1. Connect the MUT-II to the diagnosis connector.
Caution
Turn off the ignition switch before connecting or
disconnecting of the MUT-II.
2. Turn on the ignition switch.
3. Use the MUT-II to reset the code to the factory setting.
NOTE
Approximately 16 minutes are required to complete
resetting the code to the factory setting.
4. Disconnect the MUT-II

CHASSIS ELECTRICAL ± Radio and Tape Player54-73
B-8 Insufficient memory (preset stations are erased).
Is dedicated fuse No. 5 blown or is the circuit open?Ye sReplace fuse or repair harness.
No
Disconnect and check the connector at the rear of the radio.
Is the memory backup (battery) power being supplied?NoRepair harness.
Ye s
Repair or replace radio.
C. TAPE PLAYER
C-1 Cassette tape will not be inserted.
Are there any foreign objects in the tape player?Ye sRemove the object(s)*1
No*1
Attempting to force a foreign object (e.g., a coin or clip, etc.) out
of the tape player may damage the mechanism. The player should
be taken to a service dealer for repair.
Does the tape player work if another tape is inserted?Ye sReplace tape*2
No
Repair or replace tape player.
*2
Ensure that the tape label is not loose, that the tape itself is not
deformed and that the tape is tightly wound. Also, tape of C-120
or greater length often get caught in the mechanism and should
not be used.
C-2 No sound (even after a tape has been inserted).
Is dedicated fuse No. 4 blown or is the circuit open?Ye sReplace fuse or repair harness.
No
Is connector at rear of radio connected tightly?NoConnect connector firmly.
Ye s
Disconnect connector at rear of radio. Is ACC power being supplied
to the radio?Ye sRepair or replace tape player.
No
Repair harness.