Mitsubishi Montero (2004+). Manual — part 884
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-111
DTC 26: Stoplight Switch System
AC205191AB
Stoplight Switch System Circuit
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-112
.
CIRCUIT OPERATION
• Battery positive voltage is supplied to the stop-
light switch (terminal 2).
• When the brake pedal is depressed, battery posi-
tive voltage is applied to the PCM (terminal 39).
.
DTC SET CONDITIONS
If the stoplight switch is on for five minutes or more
while driving above 50 km/h (31 mph), or all of the
stop light bulbs are blown, it is judged there is a short
circuit or open circuit in the stoplight switch. This
causes DTC 26 to be set.
.
AC204188
CONNECTORS : D-28, D-29, D-123, D-125
D-28
D-28
D-29
AZ
D-123
D-123
D-125
D-125
D-29
4
2
3
1
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
9
8
6 7
5
3 4
20
32
21
33
43
17 18
30
41
16
29
28
39 40
13
25
12
24
35 36
14
26
37
15
27
38
19
31
42
1
10
22
2
11
23
34
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
AC204171
CONNECTOR : D-116
AN
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
AC204681AD
CONNECTOR: D-133
D-133 (GR)
31 32
33 34
35 36 37 38 39 40 41 42 43
44 45 46 47 48 49
50 51
52 53
54 55 56
57 58
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
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-113
TROUBLESHOOTING HINTS (THE MOST LIKELY
CAUSES FOR THIS CODE TO BE SET ARE:)
• Malfunction of the stoplight switch circuit
• Malfunction of stoplight bulb
• Damaged harness, connector
• Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
STEP 1. Check the brake pedal height.
Refer to GROUP 35A, On-vehicle Service
− Brake Pedal
Check and Adjustment
Q: Is the height adjusted properly?
YES : Go to Step 2.
NO : Adjust the brake pedal to the proper height.
STEP 2. Check the stoplight bulb.
Refer to GROUP 54A, Rear combination light
Q: Is the stoplight bulb in good condition?
YES : Go to Step 3.
NO : Replace the stoplight switch. Refer to GROUP 35A,
Brake Pedal
STEP 3. Using scan tool MB991958, check data list item 26:
Stoplight Switch.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode.
• Item 26: Stoplight Switch.
• When the brake pedal is depressed, the display on
scan tool MB991958 should be "ON."
• When the brake pedal is not depressed, the display
on scan tool MB991958 should be "OFF."
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
NO : Go to Step 4.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-114
STEP 4. Measure the stoplight switch power supply
voltage at connector D-123 by backprobing.
(1) Remove the stoplight switch from the mounting bracket.
(2) Do not disconnect connector D-123.
(3) Measure the voltage between terminal 2 and ground by
backprobing.
• The voltage should measure battery positive voltage.
Q: Is the measured voltage battery positive voltage?
YES : Go to Step 7.
NO : Go to step 5.
STEP 5. Check stoplight switch connector D-123,
intermediate connector D-28 and D-125 for loose, corroded
or damaged terminals, or terminals pushed back in the
connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC204170
CONNECTOR : D-123
CG
4
2
3
1
AC204918 BB
D-123 HARNESS CONNECTOR :
HARNESS SIDE
4
2
3
1
AC204188
CONNECTORS : D-28, D-123, D-125
D-28
D-28
AY
D-123
D-123
D-125
D-125
4
2
3
1
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
9
8
6 7
5
3 4
20
32
21
33
43
17 18
30
41
16
29
28
39 40
13
25
12
24
35 36
14
26
37
15
27
38
19
31
42
1
10
22
2
11
23
34
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