Mitsubishi Montero (2002-2004). Manual - part 459

 

  Index      Mitsubishi     Mitsubishi Montero - service repair manual 2002-2004 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  457  458  459  460   ..

 

 

Mitsubishi Montero (2002-2004). Manual - part 459

 

 

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-7

IGNITION SWITCH

GENERAL DESCRIPTION 

M1543009901014

.

Ignition key reminder tone alarm
The ignition key reminder tone alarm will sound 
under the following condition, and warn the driver to 
remove the ignition key.

• The driver's door is opened when the ignition 

switch is at "LOCK" (OFF) or "ACC" position with-
out removing the ignition key.

However, the light reminder tone alarm will take pre-
cedence over this function.

.

Immobilizer system
The immobilizer system consists of the ignition key, 
the key ring antenna, the immobilizer-ECU, and the 
PCM. The ignition key has a built-in transponder. The 
key ring antenna is installed on the steering lock key 
cylinder. Only the registered ignition key permits the 
engine to start, therefore, the engine can never be 
started by means of a forged key or by connecting 
the ignition wiring directly. The system is significantly 
safe and reliable against theft. In addition, the driver 
has only to turn the ignition switch to the "ON" posi-
tion to activate the immobilizer system. If the require-
ments for starting the engine are not satisfied, the 
engine will be immobilized. If the ignition key is lost 
or another ignition key is added, the encrypted code 
can be registered or erased by using scan tool. 

IGNITION KEY REMINDER TORN ALARM DIAGNOSIS

M1543000700678

The Ignition key reminder tone alarms is controlled 
by the Simplified Wiring System (SWS). For trouble-
shooting, refer to GROUP 54B, SWS Diagnosis 

P.54Bb-2

.

IMMOBILIZER SYSTEM DIAGNOSIS

INTRODUCTION TO IMMOBILIZER SYSTEM DIAGNOSIS

M1543009901025

CAUTION

The encrypted code should always be re-regis-
tered when replacing the immobilizer-ECU.
The immobilizer system consists of the immobilizer-
ECU, PCM, ignition key and ignition key ring 
antenna. If the engine cannot be started by using a 
registered ignition key, one of these components 
may be defective. If the immobilizer system has 
immobilized the engine, MFI system DTC P1610 will 
be output. In this case, observe the immobilizer sys-
tem troubleshooting.

IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1543006900539

Use the following steps to plan your diagnostic strat-
egy.
1. Gather information about the problem from the 

customer.

2. Verify that the condition as described by the 

customer exists.

3. Check the vehicle for any immobilizer system 

DTCs.

4. If you cannot verify the condition and there are no 

immobilizer system DTCs, the malfunction is 
intermittent. Refer to GROUP 00, How to Use 
Troubleshooting/inspection Service Points 

− How 

to Cope with Intermittent Malfunctions 

P.00E-6

.

5. If you can verify the condition but there are no 

immobilizer system DTCs, or the system cannot 
communicate with scan tool MB991502, refer to 
Symptom Chart and find the fault 

P.54A-12

.

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-8

6. If there is an immobilizer system DTC, record the 

DTC, then erase it from the memory using scan 
tool MBB991502.

7. Recreate the immobilizer system DTC set 

conditions to see if the same immobilizer system 
DTC will resets.

(1) If the same immobilize system DTC resets, 

perform the appropriate diagnostic procedure. 
Refer to Diagnostic Trouble Code Chart 

P.54A-8

.

(2) If the same immobilizer system DTC does not 

reset, the malfunction is intermittent. Refer to 
GROUP 00, How to Use Troubleshooting/
inspection Service Points 

− How to Cope with 

Intermittent   Malfunctions 

P.00-6

.

IMMOBILIZER SYSTEM TROUBLE CODE 
DIAGNOSIS

M1543007000283

Retrieving and Erasing Immobilizer System 
Diagnostic Trouble Codes

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

CAUTION

Always turn the ignition switch to "LOCK" (OFF) position 
before connecting or disconnecting scan tool MB991502. 
1. Connect scan tool MB991502 to data link connector (16- 

pin).

2. Turn the ignition switch to "ON" position.
3. Use scan tool MB991502 to check or erase immobilizer 

system DTCs.

4. Turn the ignition switch to "LOCK" (OFF) position.
5. Disconnect scan tool MB991502.

DIAGNOSTIC TROUBLE CODE CHART

M1543007100291

Use the following chart to develop proper diagnostic 
strategy.

ACX01539

16-pin

MB991502

AI

DIAGNOSTIC 
TROUBLE CODE NO.

DESCRIPTION

REFERENCE PAGE

11

Transponder communication system or radio interference 
of encrypted code

P.54A-9

.

12

Encrypted codes are not the same or are not registered

P.54A-12

.

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-9

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. The ignition key then sends an encrypted 
code. The ignition key ring antenna receives the 
encrypted code, and determines if the ignition key is 
registered.

.

DTC SET CONDITION

• DTC 11 may be output if other ignition keys are in 

the vicinity of the vehicle as it is being started.

• The transponder’s encrypted code is not sent to 

the immobilizer-ECU immediately after the igni-
tion switch is turned to "ON" position.

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

.

TROUBLESHOOTING HINTS

• Radio interference of the encrypted code

• Malfunction of the transponder

• Malfunction of the ignition key ring antenna

• Malfunction of the immobilizer-ECU

• Damaged wiring harness of connectors

AC205535AB

Ignition Key Ring Antenna Circuit

AC204170

CONNECTOR : D-121

DN

AC204172

CONNECTOR : D-201

AJ

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-10

.

DIAGNOSIS 

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

STEP 1. Check for presence of 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. 

Retest the system.

NO :  Go to Step 2.

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

which the 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

. Retest the system.

NO :  Go to Step 3.

STEP 3. Check that DTC is output, DTC 11 or 12?
Q: Which DTC is output, DTC 11 or 12?

DTC12 is output : Refer to DTC 12 

P.54A-12

.

DTC11 is output : Go to Step 4.

STEP 4. Check the ignition key ring antenna by 
backprobing.
Do not disconnect the ignition key ring antenna connector D-
201 and check the resistance on the harness side connector 
between terminal number 1 and terminal number 2 by 
backprobing.
Q: Is the resistance less than 2 ohms?

YES : Go to Step 5.
NO :  Replace the ignition key ring antenna. Retest the 

system.

ACX01679AC

CONNECTOR: D - 201

1 2

 

 

 

 

 

 

 

Content   ..  457  458  459  460   ..