Mitsubishi Montero (2002-2004). Manual — part 461
IGNITION SWITCH
TSB Revision
CHASSIS ELECTRICAL
54A-15
STEP 2. Check the immobilizer-ECU power supply circuit
by backprobing.
(1) Do not disconnect immobilizer-ECU connector D-121.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 7 and ground by
backprobing.
Q: Is battery voltage (approximately 12 volts) present?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check immobilizer-ECU connector D-121 and MFI
relay connector B-22X for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are immobilizer-ECU connector D-121 and MFI relay
connector B-22X damaged?
YES : Repair or replace them. Refer to GROUP 00E,
Harness Connector Inspection
. Confirm that
scan tool MB991502 communicates normally.
NO : Go to Step 4.
AC204170
CONNECTOR : D-121
CV
HARNESS SIDE
2
3
8 7
9
10
1
6
5
12
4
11
AC204738 EB
HARNESS SIDE: D-121
4
3
2
7 8 9 10 11
5
12
1
6
AC204745
CONNECTOR : B-22X
AB
1
3 4
2
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-16
STEP 4. Check the harness wires between immobilizer-
ECU connector D-121 and MFI relay connector B-22X.
NOTE: Also check intermediate connector E-111 and joint con-
nector D-116,check the wires. If intermediate connector E-111
and joint connector D-116 are damaged, repair or replace
them. Refer to GROUP 00E, Harness Connector Inspection
.
Q: Are the harness wires between immobilizer-ECU
connector D-121 and MFI relay connector B-22X
damaged?
YES : Replace them. Confirm that scan tool MB991502
communicates normally.
NO : There is no action to be taken.
AC204745
CONNECTOR : B-22X
AB
1
3 4
2
AC204170
CONNECTOR : D-121
CV
HARNESS SIDE
2
3
8 7
9
10
1
6
5
12
4
11
AC204171
CONNECTOR : D-116
AD
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
AC204176
CONNECTOR : E-111
BF
15
4
14
37
36
26 27
12
11
35
34
23 24
3
13
25
9
2
8
32
20 21
6
5
17
29
30
18
1
7
19
31
10
22
33
16
28
38
IGNITION SWITCH
TSB Revision
CHASSIS ELECTRICAL
54A-17
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
MB991502 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-18
STEP 7. Check the harness wire between immobilizer-ECU
connector D-121 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 and ground damaged?
YES : Repair it. Confirm that scan tool MB991502
communicates normally.
NO : There is no action to be taken.
STEP 8. Check the harness wires between immobilizer-
ECU connector D-121 and PCM connector D-110.
Q: Are the harness wires between immobilizer-ECU
connector D-121 and PCM connector D-110 damaged?
YES : Repair them. Confirm that scan tool MB991502
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 the 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 MB991502
communicates normally
NO : Go to Step 10.
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
AC204170
CONNECTOR : D-121
CV
HARNESS SIDE
2
3
8 7
9
10
1
6
5
12
4
11
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