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
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
No : Go to Step 3.
AC306409AF
MB991911
MB991824
MB991827
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-26
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
.
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
).
NO : Refer to GROUP 13A, Diagnosis
− Symptom Chart
. If the malfunction is not resolved, replace
the immobilizer-ECU. Then register the password
(secret code) and encrypted code. (Refer to
). 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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CHASSIS ELECTRICAL
54A-27
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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CHASSIS ELECTRICAL
54A-28
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
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