Mitsubishi Montero Sport (2004+). Manual — part 708
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AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-397
STEP 10. Using scan tool MB991958, check data list item
66: Overdrive Off Signal (Auto-cruise control-ECU Signal).
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) Start the engine and prepare to test drive the vehicle.
(Operate the auto-cruise)
(3) Set scan tool MB991958 to data reading mode.
• Item 66: Overdrive Off Signal (Auto-cruise control-ECU
Signal).
• When driving at level road, the display should be
"OFF."
• When driving at uphill road, the display should be
"ON."
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the auto-cruise control-ECU 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 : Replace the PCM.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
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AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-398
INSPECTION PROCEDURE 17: Transfer Low Detection Switch System
AC103768
Transfer Low Detection Switch System Circuit
AB
AC103769
CONNECTOR: B-17
AC
B-17
1
AC202317
PCM
120
107
119
106
129 130
118
105
117
114115116
126127128
104
111
103
112
108
101102
109110
121122123
124
113
125
CONNECTOR: C-92
C-92 (GR)
AB
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AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-399
.
CIRCUIT OPERATION
• A battery positive voltage is applied to the trans-
fer low detection switch output terminal (terminal
1) from the PCM (terminal 112) via the resistance
in the unit.
• The transfer low detection switch is grounded
through the transfer case to the vehicle body.
.
COMMENT
If the transmission will not shift to 3rd gear, or if it
shifts to 3rd gear when the transfer lever is in the
"4L" position, the cause is probably a malfunction of
the transfer low detection switch.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
• Malfunction of the transfer low detection switch
• Damaged harness, connector
• Malfunction of the PCM
AC202318
22
9 10
20
19
6 7 8
21
17
1516
5
14
1213
3
2
4
18
11
1
AB
CONNECTOR: C-96
C-96
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AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-400
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. Using scan tool MB991958, check data list item 75:
Transfer Low Detection 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 data reading mode.
• Item 75: Transfer Low Detection Switch.
• When the transfer shift lever position is 4L, the scan
tool MB991958 display should be "ON."
• When the transfer shift lever position is other than
4L, the scan tool MB991958 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 transfer low detection switch connector
B-17 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
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AC103769
CONNECTOR: B-17
AC
B-17
1
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