Mitsubishi Montero (2002-2004). Manual — part 989
SYMPTOM PROCEDURES <AUTOMATIC TRANSMISSION>
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SYMPTOM PROCEDURES
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INSPECTION PROCEDURE 18: 4LLc Detection Switch System
AC205257AB
4LLc Detection Switch System Circuit
AC204395
CONNECTOR : C-05
AG
C-05 (BR)
C-05
1
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SYMPTOM PROCEDURES
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.
CIRCUIT OPERATION
• A battery positive voltage is applied to the 4LLc
detection switch output terminal (terminal 1) from
the PCM (terminal 55) via the resistance in the
unit.
• The 4LLc detection switch is grounded through
the transfer case to the vehicle body.
.
COMMENT
If the transmission will not shift to 4th gear, or if it
shifts to 4th gear when the transfer lever is in the
"4LLc" position, the cause is probably a malfunction
of the 4LLc detection switch.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
• Malfunction of the 4LLc detection switch
• Damaged harness, connector
• Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
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-114
BD
38
28
16
33
22
10
31
19
7
1
18
30
29
17
5
6
21
20
32
8
2
9
25
13
3
24
23
3435
1112
27
26
3637
14
4
15
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STEP 1. Using scan tool MB991502, check data list item 75:
4LLc Detection Switch.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to data reading mode for item 75,
4LLc Detection Switch.
• When the transfer shift lever position is 4LLc, scan tool
MB991502 display should be "ON."
• When the transfer shift lever position is other than 4LLc,
scan tool MB991502 display 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 2.
STEP 2. Check 4LLc detection switch connector C-05 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
ACX01539AD
MB991502
16-PIN
AC204395
CONNECTOR : C-05
AG
C-05 (BR)
C-05
1
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STEP 3. Measure the switch output voltage at 4LLc
detection switch connector C-05.
(1) Disconnect connector C-05 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.
• The voltage should measure battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES : Go to Step 10.
NO : Go to Step 4.
AC204395
CONNECTOR : C-05
AG
C-05 (BR)
C-05
1
AC204918 AO
C-05 HARNESS CONNECTOR :
COMPONENT SIDE
1
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