2000 MITSUBISHI MONTERO Service Repair Manual

CHASSIS ELECTRICAL-Ignition Switch and Immobilizer <4D56>54A-15
INSPECTION PROCEDURES FOR EACH DIAGNOSIS CODE
Code No. 11 Problem related to communication with the
ignition keyProbable cause
When the ignition switch is at the ON position, the encrypted codes
are not transmitted from the ignition key to the immobilizer-ECU.D
Malfunction of ignition key
D
Malfunction of immobilizer-ECU
D
Malfunction of harness or connector
YES
NOCan otherkeys which havebeen registered beused to start
the engine?
If code No. 12 is
output
Check the diagnosis codes.To inspection procedure 12 classified by diagnosis code
(Refer to P.54A-15.)
Check the following connectors:D-133, D-201
Register the ignition key.
If code No. 11 is
output
OK
NG
Check the trouble symptoms.
Check the harness between the immobilizer-ECU and the
ignition key ring antenna.NG
OKNG
Check the trouble symptoms.
Replace the immobilizer-ECU.NGRepair
Repair
Replace the ignition key which cannot start the engine.
Code No. 12 Ignition key is not registered, or encrypted
code from ignition key does not match.Probable cause
The ignition key has not been registered with the immobilizer-ECU.D
The ignition key has not been registered
with the immobilizer-ECU.
D
Malfunction of immobilizer-ECU
OK
NG
Replace the immobilizer-ECU.
Check the trouble symptoms.Register the encrypted code.
INSPECTION PROCEDURES FOR EACH TROUBLE SYMPTOM
Trouble SymptomInspection
procedure
No.Reference page
Communication with MUT-IIis not possible.–GROUP 13B,
13C - Trouble-
shooting
The ignition keys cannot be registered using the MUT-II.154A-16
The engine does not start. (The engine cranks but does not fire.)254A-17
Immobilizer-ECU power supply and earth circuit system check354A-18


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CHASSIS ELECTRICAL-Ignition Switch and Immobilizer <4D56>54A-16
INSPECTION PROCEDURES FOR EACH TROUBLE SYMPTOM
Inspection procedure 1
The ignition keys cannot be registered using the MUT-II.
Probable cause
The ignition key has not been registered with the immobilizer-ECU.
Or that there is a problem with the immobilizer-ECU.D
Malfunction of ignition key
D
Malfunction of harness or connector
D
Malfunction of immobilizer-ECU
OK
Check the trouble symptoms.
NG
Register the ignition key.
YES
NO YESIs a normal diagnosis code output?
NOCan none of the ignitionkeys beregistered?Replace the ignition key that cannot be registered.
To Chart Classified by Diagnosis Codes (Refer to P.54A-14.)
OKImmobilizer-ECU power supply and earth circuit system check
(Refer to Inspection Procedure 3.)
NG
Replace the immobilizer-ECU.
Check the trouble symptoms.
OK
Check the trouble symptoms.
NG
Repair
Check the harness between the immobilizer-ECU and the
diagnosis connector.
Repair
Check the following connectors:D-133, D-33, D-222, D-28
NG
NG


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CHASSIS ELECTRICAL-Ignition Switch and Immobilizer <4D56>54A-17
Inspection procedure 2
The engine does not start.
(The engine cranks but does not fire.)
Probable cause
If the fuel injection does not operate, the cause is probably a problem
with the immobilizer-ECU, or it could also be a problem with the
diesel fuel system. If an attempt has been made to start the engine
with a key that has not been properly registered, the above symptom
is a sign of normal operation.D
Malfunction of diesel fuel system
D
Malfunction of immobilizer-ECU
NGBattery check (P.54A-4)
YES
NOTo Chart Classified by Diagnosis Codes (Refer to P.54A-14.)Is a normal diagnosis code output from the immobilizer-ECU?
OK
Voltage check during cranking
OK:8V or higher
NG
Immobilizer-ECU power supply and earth circuit system check
(Refer to Inspection Procedure 4.)
Check the trouble symptoms.
NG
To inspection procedures if the enginedoes not fire
(Refer to GROUP 13B, 13C - Troubleshooting.)
OK
Check the trouble symptoms.
NG
OK
NG
Replace the immobilizer-ECU.
Check the trouble symptoms.
OK
Check the trouble symptoms.
NG
Repair
Check the harness between the immobilizer-ECU and the fuel
cut valve controller.
Repair
Check the following connectors:D-133, D-13, B-03


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C
heck th e tr o uble sym pto m s.
N G (
3 )N G
NG O
K C
heck th e harn ess betw een th e im mobiliz e r-E C U and body
e arth , and re pair if nece ssa ry . O
K C
heck th e tr o uble sym pto m s.
N G C
heck th e harn ess betw een fu sib le lin k No. 1 and th e
i m mobiliz e r-E C U, and re pair if nece ssa ry . C
heck th e harn ess betw een th e ig nit io n sw it c h (IG 1) and th e
i m mobiliz e r-E C U, and re pair if nece ssa ry . C
heck th e fo llo w in g co nnecto rs : D
-2 10, D-3 1, D -1 33
N G
(
2 )N G C
heck th e tr o uble sym pto m s. M
easu re at im mobiliz e r-E C U co nnecto r D-6 0-1 .
D I
g nit io n sw it c h : O N
D D
is co nnect th e co nnecto r and measu re at th e harn ess
s id e.
( 1 ) Volt a ge betw een te rm in al 7 and body earth
O K: S
yste m vo lt a ge
( 2 ) Volt a ge betw een te rm in al 6 and body earth
O K: S
yste m vo lt a ge
( 3 ) Volt a ge betw een te rm in al 3 and body earth
O K: C
ontin uit y S
ig nal I
n sp ectio n co ndit io ns T
e rm in alvo lt a ge 1 D
ia gnosis co nnecto r - -
2 - - -
3 I
m mobiliz e r-E C U earth A
lw ays 0
V 4 - - -
5 E
ngin e-E C U - -
6 I
g nit io n sw it c h (IG 1) pow er su pply I
g nit io n sw it c h :O N S
yste m vo lt a ge 7 I
m mobiliz e r-E C U pow er su pply A
lw ays S
yste m vo lt a ge 8
, 9 - - -
1
0 I
g nit io n ke y rin g ante nna - -
1
1 I
g nit io n ke y rin g ante nna - -
1
2 D
ia gnosis co nnecto r - -

I
G NIT IO N SW IT C H AND IM MOBIL IZ E R -E C U
R EM OVA L AND IN STA LLA TIO N

T
e rm in alN o. s
w it c h posi-
t io n 1 2 4 5 6
L
O CK A
C C O
N S
TA R T T
e rm in alN o. 4 6
R
em ove d I
n se rte d

CHASSIS ELECTRICAL-Ignition Switch and Immobilizer <4D56>54A-21
ENCRYPTED CODE REGISTRATION METHOD
AND RESETTING THE CODE TO THE
FACTORY SETTING
Register the encrypted code in the immobilizer-ECU and then
reset the code to the factory setting after parts have been
replaced.
Replacement partEncrypted
code
Ignition keyNecessary
Ignition key ring antenna and immobilizer-ECUNecessary
Engine-ECU*Necessary
NOTE
* : If the engine-ECU is replaced, the ignition key ring antenna
and immobilizer-ECU and ignition key should be replaced
together with it.
Each engine-ECU has an individual information for
immobilizer-ECU, and the individual information is registered
in the immobilizer-ECU.
ENCRYPTED CODE REGISTRATION METHOD
If using an ignition key that has just been newly purchased,
or if the immobilizer-ECU has been replaced, you will need
to register the encrypted codes for each ignition key being
used into the immobilizer-ECU. (A maximum of eight different
encrypted codes can be registered.)
Moreover, when the immobilizer-ECU has been replaced, you
will need to use the MUT-II
to register the password that
the user specifies into the immobilizer-ECU. (Refer to the
MUT-II
instruction manual for instructions on using the MUT-II
.)
Caution
Because registering of the encrypted codes is carried
out after all previously-registered codes have been
erased, you should have ready all of the ignition keys
that have already been registered.


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