Mitsubishi Pajero Pinin. Manual - part 323

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54A-8

IGNITION SWITCH AND IMMOBILIZER SYSTEM

SPECIAL TOOL

Tool

Number

Name

Use

MB991502

MUT-

II

 sub 

assembly

D

Immobilizer system check 
(Diagnosis display using the MUT-

II

)

D

Registration of the encrypted code

A

B

C

D

MB991223

A:

MB991219

B:

MB991220

C:

MB991221

D:

MB991222

Harness set

A:

Test harness

B:

LED harness

C:

LED harness
adapter

D:

Probe

D

Fuel gauge simple check

A:

Connector pin contact pressure check

B:

Power circuit check

C:

Power circuit check

D:

Commercial tester connection

TROUBLESHOOTING

Caution
The encrypted code should always be re-registered when replacing the immobilizer-ECU.

STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING

Refer to GROUP 00 – How To Use Troubleshooting/Inspection Service Points.

DIAGNOSIS FUNCTION

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

Diagnosis code No.

Inspection items

Reference
page

11

Transponder communication system

54A-9

12

Encrypted code are not the same or are not registered

54A-9

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54A-9

INSPECTION PROCEDURE FOR DIAGNOSIS CODES

Code No. 11 Transponder communication system

Probable cause

The encrypted code of the transponder is not sent to the immobilizer-ECU immediately
after the ignition switch is turned to the ON position.

D

Malfunction of the transponder

D

Malfunction of the ignition key ring antenna

D

Malfunction of the immobilizer-ECU

Replace the immobilizer-ECU.

Does the engine start using the spare
ignition key which has had the en-
crypted code registered?

OK

Replace the ignition key that does not
work.

NG

Diagnosis codes check

Code No. 12 occurs

To INSPECTION PROCEDURE FOR
DIAGNOSIS CODE No. 12 
(Refer to P.54A-9.)

Code No. 11 occurs

Register the password (secret code)
and encrypted code (Refer to
P.54A-15.)

Code No. 12 Encrypted code are not the same or are not
registered

Probable cause

The encrypted code which is sent from the transponder is not the same as the
encrypted code which is registered in the immobilizer-ECU.

D

The encrypted code in the ignition key being used
has not been properly registered.

D

Malfunction of the immobilizer-ECU

Re-register the encrypted code.
(Refer to P.54A-15.)

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

Register the password (secret code)
and encrypted code (Refer to
P.54A-15.)

INSPECTION CHART FOR TROUBLE SYMPTOMS

Trouble symptom

Inspection procedure No.

Reference page

Communication with MUT-

II

 is impossible.

–

GROUP 13B, 13C
– Troubleshooting

Diagnosis code No. 54 has been generated by the engine-ECU.

1

54A-10

Encrypted code cannot be registered using the MUT-

II

.

2

54A-10

Engine does not start (Cranking but no initial combustion).

3

54A-11

Malfunction of the immobilizer-ECU power supply and earth circuit

4

54A-11

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54A-10

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

Inspection Procedure 1

Diagnosis code No. 54 has been generated by the
engine-ECU.

Probable cause

There is a problem with communication between the engine-ECU and the
immobilizer-ECU.

D

Malfunction of harness or connector

D

Malfunction of the immobilizer-ECU

D

Malfunction of the engine-ECU

Check the following connectors:
C-19, C-29, C-62

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between en-
gine-ECU and immobilizer-ECU.

NG

Repair

NO

Check the immobilizer-ECU power sup-
ply and earth circuit. (Refer to INSPEC-
TION PROCEDURE 4.)

OK

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

Check trouble symptoms.

NG

Replace the engine-ECU.

Register the password (secret code)
and encrypted code (Refer to
P.54A-15.)

Inspection Procedure 2

Encrypted code cannot be registered using the MUT-

II

.

Probable cause

The cause is probably that there is no encrypted code registered in the
immobilizer-ECU, or there is a malfunction of the immobilizer-ECU.

D

Malfunction of the transponder

D

Malfunction of the ignition key ring antenna

D

Malfunction of harness or connector

D

Malfunction of the immobilizer-ECU

No ignition key can be registered.

NO

Replace the ignition key that cannot
be registered.

YES

Is a normal diagnosis code output?

NO

To INSPECTION CHART FOR DIAG-
NOSIS CODE (Refer to P.54A-8.)

YES

Check the immobilizer-ECU power
source and earth circuit. (Refer to IN-
SPECTION PROCEDURE 4.)

OK

Check trouble symptoms.

Register the password (secret code)
and encrypted code (Refer to
P.54A-15.)

NG

Replace the immobilizer-ECU.

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54A-11

Inspection Procedure 3

Engine does not start (cranking but no initial combustion).

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.

D

Malfunction of the MPI system

D

Malfunction of the immobilizer-ECU

Register the password (secret code)
and encrypted code (Refer to
P.54A-15.)

Check the system voltage during crank-
ing.
OK: 8V or more

NG

Check the battery
(Refer to P.54A-5.)

OK

Is a normal diagnosis code output from
the immobilizer-ECU?

NO

To INSPECTION CHART FOR DIAG-
NOSIS CODE (Refer to P.54A-8.)

YES

Is a normal diagnosis code output from
the engine-ECU?

NO

Refer to GROUP 13B or 13C – Trouble-
shooting.

YES

To inspection procedure for when there
is no initial combustion. (Refer to
GROUP 13A – Troubleshooting.)

NG

Check trouble symptoms.

NG

Check the immobilizer-ECU power sup-
ply and earth circuit (Refer to INSPEC-
TION PROCEDURE 4.)

OK

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

Inspection Procedure 4

Malfunction of the immobilizer-ECU power supply and earth circuit

Measure at the immobilizer-ECU con-
nector 1.

D

Disconnect the connector and
measure at the harness side.

D

Turn the ignition switch to ON
position.

(1) Voltage between 1 and earth

OK: System voltage

(2) Continuity between 4 and earth

OK: Continuity

(1)NG

Check the following connector:
A-43X, C-29, C-62,

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between immo-
bilizer-ECU and engine control relay
and repair if necessary.

(2)NG

Check the following connector:
C-02, C-62

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between immo-
bilizer-ECU and body earth and repair
if necessary.