2000 MITSUBISHI MONTERO Service Repair Manual

CHASSIS ELECTRICAL-Ignition Switch and Immobilizer 54A-7
DIAGNOSIS CODE MEMORY ERASING PROCEDURE
Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.
INSPECTION USING SIMPLE CHECK DIAGNOSIS MODE
1. Change to Simple Check Diagnosis mode and activate switch diagnosis mode.
(Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.)
2. In this condition, the input signals for the following switches can be checked.
CHART CLASSIFIED BY DIAGNOSIS CODES
Code No.Diagnosis contentsReference
page
11Problem related to communication with the ignition key54A-7
12Ignition key is not registered, or encrypted code from ignition key does not match.54A-7
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
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-7.)
Replace the immobilizer-ECU.
Register the ignition key.
If code No. 11 is
output
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.


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CHASSIS ELECTRICAL-Ignition Switch and Immobilizer 54A-8
INSPECTION PROCEDURES FOR EACH TROUBLE SYMPTOM
Trouble SymptomInspection
procedure
No.Reference page
Communication with MUT-IIis not possible.–GROUP 13B,
13C - Trouble-
shooting
Diagnosis code No. 54 is generated by the engine-A/T-ECU <6G74-A/T> or by the
engine-ECU <6G74-M/T, 4M41>.154A-8
The ignition keys cannot be registered using the MUT-II.254A-9
The engine does not start.(The engine cranks but does not fire.)354A-9
Immobilizer-ECU power supply and earth circuit system check454A-10
INSPECTION PROCEDURES FOR EACH TROUBLE SYMPTOM
Inspection procedure 1
Diagnosis code No. 54 is generated by the engine-
A/T-ECU <6G74-A/T> or by the engine-ECU <6G74-M/T,
4M41>.
Probable cause
The cause is probably a problem with communication between the
engine-A/T-ECU <6G74
-A/T> orengine-ECU <6G74-M/T, 4M41>
and the immobilizer-ECU.
D
Malfunction of harness or connector
D
Malfunction of engine-A/T-ECU
<6G74-A/T> or engine-ECU
<6G74-M/T, 4M41>
D
Malfunction of immobilizer-ECU
D
Malfunction of ignition key
D
The ignition key has not been registered
with the immobilizer-ECU.
NG
NG OK
Immobilizer-ECU power supply and earth circuit system check
(Refer to Inspection Procedure 4.)
OK
Check the trouble symptoms.
NGRepair
NGCheck the following connectors:D-202-1, D-202, E-13,
D-122<6G74-A/T>, D-118<6G74-M/T>, D-112<4M41>
Repair
NGCheck the harness between the engine-A/T-ECU <6G74-A/T>
or engine-ECU <6G74-M/T, 4M41> and the immobilizer-ECU,
and repair if necessary.
Replace the immobilizer-ECU.
Check the trouble symptoms.
Check the trouble symptoms.Replace the engine-A/T-ECU <6G74-A/T> or engine-ECU
<6G74-M/T, 4M41>.OK
Is a normal diagnosis code output from the immobilizer-ECU?
YESTo Chart Classified by Diagnosis Codes (Refer to P.54A-7.) NO
NG


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CHASSIS ELECTRICAL-Ignition Switch and Immobilizer 54A-9
Inspection procedure 2
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 thee is a problem with the immobilizer-ECU.D
Malfunction of ignition key
D
Malfunction of harness or connector
D
Malfunction of immobilizer-ECU
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-7.)
OKImmobilizer-ECU power supply and earth circuit system check
(Refer to Inspection Procedure 4.)
NG
Replace the immobilizer-ECU.
Check the trouble symptoms.
Inspection procedure 3
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 GDI
system or the DIESEL 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 GDI system or Diesel
fuel system
D
Malfunction of immobilizer-ECU
NGBattery check (P.54A-4)
YES
NO
Refer to GROUP 13B, 13C - Troubleshooting.YES
NO
To Chart Classified by Diagnosis Codes (Refer to P.54A-7.)Is a normal diagnosis code output from the immobilizer-ECU?
OK
Voltage check during cranking
OK:8V or higher
NG
OKImmobilizer-ECU power supply and earth circuit system check
(Refer to Inspection Procedure 4.)
NG
Replace the immobilizer-ECU.
Check the trouble symptoms.
Check the trouble symptoms.
NG
To inspection procedures if the enginedoes not fire
(Refer to GROUP 13B, 13C - Troubleshooting.)
Is a normal diagnosis code output by the engine-A/T-ECU
<6G74-A/T> or by the engine-ECU <6G74-M/T, 4M41>?


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C
heck th e harn ess betw een th e engin e co ntr o l re la y and th e
i m mobiliz e r-E C U, and re pair if nece ssa ry . O
K C
heck th e tr o uble sym pto m s. (
2 )N G O
K C
heck th e tr o uble sym pto m s. 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 .
I M MOBIL IZ E R -E C U CHEC K
T E R M IN AL VO LTA G E CHEC K TA BLE S
ig nal I
n sp ectio n co ndit io ns T
e rm in alvo lt a ge 1 I
m mobiliz e r-E C U pow er su pply I
g nit io n sw it c h : O N S
yste m vo lt a ge 2 - - -
3 E
ngin e-A /T -E C U <6G 74 ×A /T >,
E ngin e-E C U <6G 74×M /T , 4M 41> - -
4 I
m mobiliz e r-E C U earth A
tall tim es 0
V

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. p
osit io n 1 2 4 5 6
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O CK A
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TA R T T
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em ove d I
n se rte d E
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c o de I
g nit io n ke y N
ece ssa ry I
g nit io n ke y rin g ante nna and im mobiliz e r-E C U N
ece ssa ry E
ngin e-E C U* N
ece ssa ry

N
o. N
am e A
pplic a tio n M
B991502 M
UT-II S ub
a sse m bly C
heckin g th e ETA C S-E C U in put sig nals M
B990784 O
rn am entre m ove r I
n str u m ent panel under co ve r and co lu m n
c o ve r re m ova l D
ia gnosis co nte nts R
efe re nce
p age 1
1 P
ro ble m re la te d to co m munic a tio n wit h th e ig nit io n ke y 5
4A -1 5 1
2 I
g nit io n ke y is not re gis te re d, or encry p te d co de fr o m ig nit io n ke y does not m atc h . 5
4A -1 5