Mitsubishi Montero Sport (2004+). Manual - part 514

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-43

IMMOBILIZER SYSTEM TROUBLE CODE 
DIAGNOSIS

M1543007000487

Retrieving and Erasing Immobilizer System 
Diagnostic Trouble Codes

Required Special Tool:

• 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)

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to data link connector (16 

pin).

2. Turn the ignition switch to the "ON" position.
3. Use scan tool MB991958 to check or erase immobilizer 

system diagnostic trouble codes.

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

DIAGNOSTIC TROUBLE CODE CHART

M1543007100268

Follow the inspection chart that is appropriate for the 
diagnostic trouble code.

NOTE:  Diagnostic trouble code is not recorded.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

DIAGNOSTIC 
TROUBLE CODE NO.

DESCRIPTION

REFERENCE PAGE

11

Transponder communication system or radio interference 
of encrypted code

Refer to 

P.54-44

.

12

Encrypted codes are not the same or are not registered

Refer to 

P.54-47

.

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-44

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC: 11 Transponder Communication System or Radio Interference of Encrypted Code

.

CIRCUIT OPERATION
The ignition key is powered by the ignition key ring 
antenna, and sends an encrypted code. The ignition 
key ring antenna receives the encrypted code, and 
determines whether the ignition key is a registered 
key or not.

.

DTC SET CONDITION

• If the engine is started while several ignition keys 

are in the vicinity, interference between the differ-
ent keys may occur, which will cause this code to 
be generated.

• The encrypted code of the transponder is not 

sent to the immobilizer-ECU immediately after 
the ignition switch is turned to "ON" position.

NOTE:  DTC 11 is always output together with MFI 
system DTC P1610.

.

AC004092 AB

Ignition Key Ring Antenna Circuit

AC003448 AC

CONNECTOR: C-107

C-107

AC003449 AC

CONNECTOR: D-28

D-28

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-45

TROUBLESHOOTING HINTS

• Radio interference of encrypted code

• Malfunction of transponder

• Malfunction of ignition key ring antenna

• Malfunction of immobilizer-ECU

• Damaged wiring harness of connectors

.

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. Check that there is other key near the key in the 
ignition.
Q: Is there any other key near the key in the ignition?

YES : Move the other key well away from key being used. 

Confirm that diagnostic trouble code 11 is not output.

NO :  Go to Step 2.

STEP 2. Check that the engine starts using the spare 
ignition key which encrypted code has been registered.
Q: Does the engine start using the spare ignition key which 

encrypted code has been registered?
YES : Replace the ignition key that does not work. Then 

register the password (secret code) and encrypted 
code 

P.00E-2

. Confirm that diagnostic trouble code 

11 is not output.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code.

Check that DTC 11 or DTC 12 is output.
Q: Which DTC is output, DTC 11 or 12?

DTC 12 is output : Refer to DTC 12 

P.54-47

.

DTC 11 is output : Go to Step 4.

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-46

STEP 4. Check the ignition key ring antenna.

(1) Disconnect ignition key ring antenna connector 

D-28.

(2) Measure the resistance between terminal 1 and 2.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with 

this range?
YES : Go to Step 5.
NO :  Replace the ignition key ring antenna. Confirm that 

diagnostic trouble code 11 is not output.

STEP 5. Check immobilizer-ECU connector C-107 and 
ignition key ring antenna connector D-28 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Are immobilizer-ECU connector C-107 and ignition key 

ring antenna connector D-28 in good condition?
YES : Go to Step 6.
NO :  Repair or replace them. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

. Confirm that 

diagnostic trouble code 11 is not output.

AC003450AB

CONNECTOR: D-28

2

1

AC202105AB

D-28 HARNESS CONNECTOR:
IGNITION KEY RING ANTENNA SIDE

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