immobilizer MITSUBISHI TRITON 1997 Owner's Manual

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 System54-17
Inspection Procedure 5
Malfunction of the immobilizer-ECU power source and earth circuit
Measure at the immobilizer-ECU con-
nector C-36.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON
1. Voltage between 1 and body earth,
2 and body earth vehicles> and between 9 and body
earth.
OK:System voltage
2. Continuity between 8 and body earth
and between 16 and body earth.
OK:Continuity(1) NGCheck the following connectors:

C-19, C-36, C-87, C-83

C-36, C-87, C-83NG
Repair
OK
Check trouble symptom.NG
Check the harness between the immobi-
lizer-ECU and engine control relay, and
repair if necessary.

Check the harness between the immobi-
lizer-ECU and junction block, and repair
if necessary.
(2) NG
Check the following connector:
C-36NG
Repair
OK
Check trouble symptom.NGCheck the harness between the immobi-
lizer-ECU and body earth and repair if
necessary.
Inspection Procedure 6
Malfunction of the fuel cut valve controller power source and earth circuit

OK
Check trouble symptom.NGCheck the harness between the fuel cut
valve controller and junction block, and
repair if necessary.
(2) NGCheck the following connector:
A-90NG
Repair
OK
Check trouble symptom.NGCheck the harness between the fuel cut
valve controller and earth, and repair
if necessary.
Measure at the fuel cut valve controller
connector A-90.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON
1. Voltage between 2 and body earth.
OK:System voltage
2. Continuity between 3 and body
earth.
OK:Continuity(1) NGCheck the following connectors:
A-90, C-19, C-87NG
Repair

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