Mitsubishi Montero Sport (2004+). Manual - part 515

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-47

STEP 6. Check the harness wires between 
immobilizer-ECU connector C-107 (terminal No.10 and 11) 
and ignition key ring antenna connector D-28 (terminal 
No.1 and 2).

Q: Are the harness wires between immobilizer-ECU 

connector C-107 (terminal No.10 and 11) and ignition 
key ring antenna connector D-28 (terminal No.1 and 2) 
in good condition?
YES : Replace the immobilizer-ECU. Then register the 

password (secret code) and encrypted code 

P.54-65

. 

Confirm that diagnostic trouble code 11 is not output.

NO :  Repair them. Confirm that diagnostic trouble code 11 

is not output.

DTC12: Encrypted Codes are not the Same or not Registered.

.

DTC SET CONDITION
The encrypted code which is sent from the transponder is not 
the same as the encrypted code which is registered in the 
immobilizer-ECU.
NOTE: DTC 12 is always output together with MFI system DTC 
P1610.

.

TROUBLESHOOTING HINTS

• The encrypted code in the ignition key being used has not 

been properly registered.

• Malfunction of immobilizer-ECU

.

DIAGNOSIS

STEP 1. Check that the encrypted code was registered.
Q: Was the encrypted code registered?

YES : Replace the immobilizer and then re-register the 

encrypted code (Refer to 

P.54-65

.)

NO :  Register the encrypted code (Refer to 

P.54-65

.)

AC202606

C-107

1

2
7

6

3

4

5

12 11 10 9 8

CONNECTOR: C-107

AC

COMPONENT SIDE

AC202095

2

1

COMPONENT SIDE

AC

D-28

CONNECTOR: D-28

1

2

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-48

SYMPTOM CHART

M1543007201183

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with Scan Tool MB991958 is Impossible.

SYMPTOM

INSPECTION 
PROCEDURE NO.

REFERENCE PAGE

Communication with scan tool MB991958 is impossible.

1

 

P.54-48

Registering the ignition key is impossible.

2

 

P.54-55

The "SECURITY" indicator does not illuminate.

3

 

P.54-57

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

4

 

P.54-61

JOINT 
CONNECTOR (5)

JOINT 
CONNECTOR (5)

POWERTRAIN
CONTROL
MODULE

MULTIPORT
FUEL
INJECTION RELAY

IMMOBILIZER-
ECU

POWER
SUPPLY
CIRCUIT

Immobilizer-ECU Power Supply, Ground and PCM Communication Line Circuit

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-49

.

CIRCUIT OPERATION
Immobilizer-ECU is energized when the ignition 
switch is turned "ON," and the engine control relay is 
turned on. The powertrain control module transmits a 
signal from scan tool MB991958 to the immobi-
lizer-ECU as it is. In the same way, a signal from the 
immobilizer-ECU is also transmitted to scan tool 
MB991958 as it is.

.

TECHNICAL DESCRIPTION (COMMENT)

• This malfunction may be caused by a defective 

immobilizer-ECU, powertrain control module, or a 
defect in the communication line between the 
immobilizer-ECU and powertrain control module. 
If this malfunction appears when the MFI system 
and scan tool MB991958 can communicate each 
other, MFI system DTC P0513 will reset.

• If the MFI system is normal, the MFI relay can be 

determined as normal. In addition, if the MFI sys-
tem and scan tool MB991958 can communicate 
each other, the circuits between the data link con-
nector and the powertrain control module can 
determined as normal.
NOTE:  If this malfunction appears, MFI system 
DTC P0513 will be output.

.

TROUBLESHOOTING HINTS

• Malfunction of immobilizer-ECU

• Malfunction of powertrain control module

• Damaged harness wires or connectors

AC003451

CONNECTORS: C-14, C-59, C-92

AF

C-14

C-59

C-92 (GR)

AC003622

CONNECTOR: C-72

AD

C-72 (B)

AC003452

AC

CONNECTORS: C-85, C-107

C-85

C-107

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-50

.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B (Vehicles without 

CAN communication system)

STEP 1. Using scan toll MB991958, read the MFI system 
diagnostic trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool.
Use scan tool MB991958 to confirm the MFI system DTC.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch "ON" to position.
(3) Read the MFI system diagnosis code.

NOTE: If the scan tool MB991958 cannot communicate 
with the MFI system, refer to GROUP 13A, MFI Diagnosis 

−

 

Symptom Procedure 

P.13A-719

.

Q: Is an MFI system DTC P0513 output?

YES : Refer to GROUP 13A, MFI Diagnosis 

− Diagnostic 

Trouble Code Procedures 

P.13A-661

.

NO :  Go to Step 2. 

AK303629AB

MB991911

MB991827

MB991824 

16-PIN