Mitsubishi Montero Sport (2004+). Manual - part 517

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-55

STEP 10. Recheck for malfunction.
Q: Is a malfunction eliminated? 

YES : The procedure is complete. (If no malfunction are 

found in all steps, an intermittent malfunction is 
suspected. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-7

.)

NO :  Replace the immobilizer-ECU or powertrain control 

module.

INSPECTION PROCEDURE 2: Registering the Ignition Key is Impossible.

.

TECHNICAL DESCRIPTION (COMMENT)
The transponder built-in ignition key or the immobi-
lizer-ECU is suspected to be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of ignition key

• Malfunction of immobilizer-ECU 

.

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)

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-56

STEP 1. Using scan tool MB991958, read the 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 MB991958.
Use scan tool MB991958 to check if DTC 11 set.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch "ON" position.
(3) Read the immobilizer system diagnostic trouble code.
Q: Does DTC11 reset?

YES : Refer to 

P.13A-26

.

NO :  Replace the ignition key that cannot be registered. 

Then re-register the encrypted code. (Refer to 

P.54-43

.) Check that the ignition key can be 

registered. Then go to Step 2.

STEP 2. Recheck for malfunction.
Q: Is a malfunction eliminated? 

YES : The procedure is complete. (If no malfunction are 

found in all steps, an intermittent malfunction is 
suspected. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-7

.)

NO :  Replace the immobilizer-ECU.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-57

INSPECTION PROCEDURE 3: The "IMMOBILIZER" Indicator Light does not Illuminate.

.

JUNCTION 
BLOCK

IMMOBILIZER-
ECU

IGNITION
SWITCH (IG1)

COMBINATION
METER

The "IMMOBILIZER" Indicator Light Circuit

AC003465

CONNECTORS: C-04, C-05

AD

C-04

C-05

AC003518

AD

CONNECTOR: D-06

JUNCTION BLOCK (FRONT)

D-06

AC003519

CONNECTOR: D-08

AD

JUNCTION BLOCK (REAR)

D-08

AC003448 AC

CONNECTOR: C-107

C-107

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-58

CIRCUIT OPERATION
If the requirements for starting the engine are not sat-
isfied, the immobilizer-ECU flashes the "IMMOBI-
LIZER" indicator for 30 seconds.

.

TECHNICAL DESCRIPTION (COMMENT)
There may be burned out bulb of the "IMMOBI-
LIZER" indicator light or a malfunction of the combi-
nation meter (printed-circuit board) or 
immobilizer-ECU.

NOTE: The "IMMOBILIZER" indicator light is shared 
by the theft-alarm system. If a problem can not be 
resolved, observe the theft-alarm system trouble-
shooting 

P.54-48

.

.

TROUBLESHOOTING HINTS

• Burned out bulb of "IMMOBILIZER" indicator light

• Malfunction of combination meter (printed-circuit 

board)

• Malfunction of immobilizer-ECU

• Damaged harness wires or connectors

.

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check the "IMMOBILIZER" indicator light circuit of 
immobilizer-ECU connector C-107.

(1) Remove the immobilizer-ECU and measure at the harness 

side.

(2) Connect terminal 9 to the ground.
(3) Ignition switch "ON" position.
Q: Is the only "IMMOBILIZER" indicator light illuminate? 

(other indicator lights are in good condition)
YES : Replace the immobilizer-ECU. Then register the 

password (secret code) and encrypted code 

P.54-65

.

NO :  Go to Step 2.

STEP 2. Check the "IMMOBILIZER" indicator light. 
(1) Remove the combination meter and remove the 

"IMMOBILIZER" indicator light bulb.

(2) Check the bulb. 
Q: Is the "IMMOBILIZER" indicator light damaged?

YES : Replace it. 
NO :  Go to Step 3.

AC002739

C-107 HARNESS CONNECTOR:
COMPONENT SIDE

AF