Mitsubishi Montero Sport (2004+). Manual — part 663
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-217
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Transmission fluid temperature sensor voltage:
4.5 volts or less.
• Transmission range switch: D, 3, 2 or L.
• Output speed: 900 r/min or more.
Judgement Criteria
• Vehicle speed: no signal change. (30 seconds)
.
OBD-II DRIVE CYCLE PATTERN
Start the engine, drive at 40 km/h (25 mph) or more
continuously for one minute.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Malfunction of the vehicle speed sensor circuit
• Damaged harness, connector
• Malfunction of the PCM
AC205180
START
N
OPG-B
: Output speed
(output shaft speed sensor)
Transmission range
switch position is in
D, 3, 2 or L range
Transmission fluid
temperature sensor
voltage < 4.5 V
N
OPG-B
> 900 r/min
Is there no input from
vehicle speed sensor
Continuous failure
for 30 secs.
Yes
No
Good
Malfunction
END
Yes
No
Yes
No
Yes
No
Yes
No
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-218
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 speedometer.
Q: Is the speedometer operating properly?
YES : Go to Step 2.
NO : Check the vehicle speed sensor. Refer to GROUP 54,
Combination Meters Assembly and Vehicle Speed
Sensor
− Symptom Procedures − Speedometer does
not work
.
STEP 2. Using scan tool MB991958, check data list item 29:
Vehicle Speed Sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991958 to data reading mode.
• Item 29: Vehicle Speed Sensor.
• Check that the speedometer and scan tool display
speed match when driving at a vehicle speed of 40
km/h (25 mph).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor 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 3.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-219
STEP 3. Using an oscilloscope, check the vehicle speed
sensor waveform at PCM connector C-91 by backprobing.
(1) Do not disconnect connector C-91.
(2) Connect an oscilloscope probe to PCM connector C-91
terminal 80 by backprobing.
(3) Start the engine and drive the vehicle.
(4) Check the vehicle speed sensor waveform.
• The vehicle speed sensor waveform should show a pat-
tern similar to the illustration when running the vehicle.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : Go to Step 6.
NO : Go to Step 4.
AC202435
PCM
59
68
58
67
46 47
57
56
53
64
54
65
55
66
50
62
51
63
49
48
60 61
52
44
41 42 43
45
AC202435
PCM
CONNECTOR: C-91
AB
C-91 (GR)
71 72 73 74
75 76
77
78 79 80 81 82 83 84 85 86 87 88
90 91
92 93 94
95 96
97
98
89
AC001954
AJ
C-91 HARNESS CONNECTOR:
HARNESS SIDE
OSCILLO-
SCOPE
PROBE
ACX02131
NORMAL WAVEFORM
(V)
AC
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-220
STEP 4. Check PCM connector C-91 and intermediate
connector C-16 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 5.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC2023434
22
2021
10
9
8
1718
6 7
19
1415
4 5
1112
1 2 3
13
16
AB
CONNECTOR: C-16
C-16
AC202435
PCM
59
68
58
67
46 47
57
56
53
64
54
65
55
66
50
62
51
63
49
48
60 61
52
44
41 42 43
45
AC202435
PCM
CONNECTOR: C-91
AB
C-91 (GR)
71 72 73 74
75 76
77
78 79 80 81 82 83 84 85 86 87 88
90 91
92 93 94
95 96
97
98
89
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