Mitsubishi Montero (2002-2004). Manual — part 462
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-19
STEP 10. Recheck for malfunction.
Q: Is a malfunction eliminated?
YES : The procedure is complete. (If no malfunction are not
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 : Replace the immobilizer-ECU or PCM.
INSPECTION PROCEDURE 2: The Ignition Key cannot be Registered.
.
TECHNICAL DESCRIPTION (COMMENT)
The ignition key transponder or the immobilizer-ECU
is suspected to be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the ignition key
• Malfunction of immobilizer-ECU
.
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991502: Scan Tool (MUT-II)
STEP 1. Check the DTC.
Q: Does DTC11 reset?
YES : Refer to
.
NO : Replace the ignition key that cannot be registered.
Then re-register the encrypted code. (Refer to
.) Verify that the ignition key can be registered, then
Go to Step 2.
STEP 2. Retest the system.
Q: Does registered ignition key function properly?
YES : The procedure is complete. (If no malfunction are not
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 : Replace the immobilizer-ECU.
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-20
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
• MB991502: Scan Tool
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. Check for DTCs.
Q: Have any DTCs set?
Yes : Go to Step 3.
No : Go to Step 5.
STEP 3. Check for immobilizer system DTCs.
Q: Have any immobilizer system DTCs set?
Yes : Refer to
No : Go to Step 4.
STEP 4. Check for MFI system DTCs.
Q: Have any MFI system DTCs set?
Yes : Refer to GROUP 13A, Diagnosis
.
No : Go to Step 5.
STEP 5. 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.
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-21
DATA LIST REFERENCE TABLE
M1543007300143
CHECK AT IMMOBILIZER-ECU
M1543007600230
TERMINAL VOLTAGE CHECK
MUT-II
SCAN TOOL
DISPLAY
ITEM
NO.
INSPECTION ITEM
INSPECTION
REQUIREMENT
NORMAL
CONDITION
KEY REGISTERED
01
Key has been registered -
Number of registered ignition
keys
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 -
-
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-22
SPECIAL TOOLS
M1543000600411
ON-VEHICLE SERVICE
ENCRYPTED CODE REGISTRATION METHOD
M1543008100205
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
CAUTION
Because registering the encrypted codes is done after all
previously-registered codes have been erased, you should
keep all of the ignition keys that have already been regis-
tered accessible.
If the ignition key, Immobilizer-ECU, powertrain control module
is replaced or an ignition key is added, encrypted codes of all
the ignition keys must be registered. (A maximum of eight dif-
ferent ignition key can be registered.) Moreover, when the
immobilizer-ECU has been replaced, you will need to use scan
tool MB991502 to register the immobilizer-ECU and input the
vehicle secret code and to register the password (secret code)
that the owner specifies into the immobilizer-ECU.
TOOL
TOOL NUMBER
AND NAME
SUPERSESSION
APPLICATION
MB991502 Scan tool
(MUT-II)
MB991496-OD
• Immobilizer system
check
• Encrypted code
registration
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Test harness
B: LED harness
C: LED harness
adapter
D: Probe
MB991223
Making voltage and
resistance measurements
during troubleshooting
A: Connect pin contact
pressure inspection
B: Power circuit
inspection
C: Power circuit
inspection
D: Commercial tester
connection
B991502
MB991223
A
B
C
D
AC
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