Mitsubishi Montero (2004+). Manual - part 514

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-25

INSPECTION PROCEDURE 3: Engine Cranks, but does not Start.

.

TECHNICAL DESCRIPTION
If the engine cranks, but does not start, an MFI sys-
tem problem may exist in addition to a malfunctioning 
immobilizer system. The engine will not start if the 
ignition key has not been properly registered.

.

TROUBLESHOOTING HINTS

• Malfunction of MFI system

• 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

STEP 1. Check the battery voltage.

Measure the battery voltage during cranking.
Q: Is the voltage 8 volts or more?

YES : Go to Step 2.
NO :  Check the condition of the battery. Refer to 

P.54A-5

.

STEP 2. 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.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch "ON" position.
(3) Read the diagnosis code.
Q: Have any DTCs set?

Yes :  Refer to 

P.54A-11

.

No :  Go to Step 3.

AC306409AF

MB991911

MB991824

MB991827

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STEP 3. Using scan tool 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.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch "ON" position.
(3) Read the diagnosis code.
Q: Have any MFI system DTCs set?

Yes :  Refer to GROUP 13A, MFI Diagnosis 

− Diagnostic 

Trouble Code Procedures 

P.13A-672

.

No :  Go to Step 4.

STEP 4. Attempt to start the engine.
Q: Does the engine start?

YES : The procedure is complete (If no malfunctions 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.00-6

).

NO :  Refer to GROUP 13A, Diagnosis 

− Symptom Chart 

P.13A-30

. If the malfunction is not resolved, replace 

the immobilizer-ECU. Then register the password 
(secret code) and encrypted code. (Refer to 

P.54A-29

). The engine should now start.

DATA LIST REFERENCE TABLE

M1543007300369

AC306409AF

MB991911

MB991824

MB991827

MUT-III SCAN TOOL 
DISPLAY

ITEM 
NO.

INSPECTION ITEM

INSPECTION
REQUIREMENT

NORMAL CONDITION

KEY REGISTERED

01

Key has been registered -

Number of registered ignition 
keys

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CHECK AT IMMOBILIZER-ECU 

M1543007600531

TERMINAL VOLTAGE CHECK 

ACX01564 AB

TERMINAL NO. SIGNAL

CHECKING REQUIREMENT TERMINAL VOLTAGE

3

Immobilizer-ECU ground

Always

0V

5

Powertrain control module

-

-

7

Immobilizer-ECU power supply Ignition switch: "LOCK" (OFF)  0V

Ignition switch: "ON" 

Battery positive voltage

10

Ignition key ring antenna

-

-

11

Ignition key ring antenna

-

-

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SPECIAL TOOLS

M1543000601856

TOOL

TOOL NUMBER 
AND NAME

SUPERSESSION

APPLICATION

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

MUT-III sub assembly

A: Vehicle 

communication 
interface (V.C.I.)

B: MUT-III USB cable
C: MUT-III main 

harness A 
(Vehicles with CAN 
communication 
system)

D: MUT-III main 

harness B 
(Vehicles without 
CAN 
communication 
system)

E: MUT-III main 

harness C (for 
Daimler Chrysler 
models only)

F: MUT-III 

measurement 
adapter Harness

G: MUT-III trigger 

harness

MB991824-KIT
NOTE: MB991826 
MUT-III trigger harness 
is not necessary when 
pushing V.C.I. ENTER 
key.

Reading diagnostic 
trouble code

CAUTION

MUT-III main harness B 
(MB991911) should be 
used. MUT-III main 
harness A and C should 
not be used for this 
vehicle.

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

A

B

C

D

E

F

G

DO NOT USE

DO NOT USE