Mitsubishi Montero (2004+). Manual — part 513
IGNITION SWITCH
TSB Revision
CHASSIS ELECTRICAL
54A-21
STEP 5. Check the immobilizer-ECU ground circuit by
backprobing.
(1) Do not disconnect immobilizer-ECU connector D-121.
(2) Measure the resistance between terminal 3 and ground by
backprobing.
Q: Is the resistance less than 2 ohms?
YES : Go to Step 7.
NO : Go to Step 8.
STEP 6. Check immobilizer-ECU connector D-121 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is immobilizer-ECU connector D-121 in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Confirm that scan tool
MB991958 communicates normally.
AC204170
CONNECTOR : D-121
CV
HARNESS SIDE
2
3
8 7
9
10
1
6
5
12
4
11
AC204738 EH
HARNESS SIDE: D-121
4
3
2
7 8 9 10 11
5
12
1
6
AC204170
CONNECTOR : D-121
CV
HARNESS SIDE
2
3
8 7
9
10
1
6
5
12
4
11
IGNITION SWITCH
TSB Revision
CHASSIS ELECTRICAL
54A-22
STEP 7. Check the harness wire between immobilizer-ECU
connector D-121 (terminal 3) and ground.
NOTE: Also check intermediate connector D-30, check the
wires. If intermediate connector D-30 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion
.
Q: Is the harness wire between immobilizer-ECU connector
D-121 (terminal 3) and ground damaged?
YES : Repair it. Confirm that scan tool MB991958
communicates normally.
NO : There is no action to be taken.
AC204188
CONNECTORS : D-30, D-121
D-30
BP
D-30
D-121
D-121
9 10
8
6 7
31 32
30
29
18 19 20 21
5
4
2
1
3
27
26
24
23
25
12 13 14 15 16 17
28
11
22
33
HARNESS SIDE
2
3
8 7
9
10
1
6
5
12
4
11
IGNITION SWITCH
TSB Revision
CHASSIS ELECTRICAL
54A-23
STEP 8. Check the harness wires between
immobilizer-ECU connector D-121 (terminal 5) and PCM
connector D-134 (terminal 65).
Q: Are the harness wires between immobilizer-ECU
connector D-121 (terminal 5) and PCM connector D-134
(terminal 65) damaged?
YES : Repair them. Confirm that scan tool MB991958
communicates normally.
NO : Go to Step 9.
STEP 9. Replace the immobilizer-ECU or PCM.
Replace the immobilizer-ECU or PCM.
Q: Did the communication with scan tool become possible
after replacing the immobilizer-ECU or the power train
control module?
YES : Register the password (secret code) and encrypted
code
. Confirm that scan tool MB991958
communicates normally
NO : Go to Step 10.
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.
AC204170
CONNECTOR : D-121
CV
HARNESS SIDE
2
3
8 7
9
10
1
6
5
12
4
11
AC204171
CONNECTOR: D-134
COMPONENT SIDE
D-134(GR)
D-134(GR)
AF
76
85
65
72
71
73
82
75
81
74
6364
66
70
69
68
67
78
87
79
8889
80
77
86
62
61
8384
IGNITION SWITCH
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CHASSIS ELECTRICAL
54A-24
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
• 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. 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.
Use scan tool MB991958 to check if DTC 11 is 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
.
NO : Replace the ignition key that cannot 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
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.
AC306409AF
MB991911
MB991824
MB991827
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