Mitsubishi Montero (2004+). Manual — part 873
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 6. Using scan tool MB991958, check data list item 15:
Transmission Fluid Temperature Sensor.
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.
(3) Set scan tool MB991958 to the data reading mode.
• Item 15: Transmission Fluid Temperature Sensor.
• When the engine is cool: Almost equal to the ambi-
ent temperature (atmospheric temperature)
NOTE: Set scan tool MB991958 to the data reading
mode for item number 13, Intake Air Temperature
(IAT) Sensor and note the temperature measure-
ment. When the engine is cool, the temperature
should be almost equal to the ambient temperature
(atmospheric temperature), and the IAT sensor mea-
surement should be approximately the same as the
Transmission Fluid Temperature Sensor.
• When the engine is warm: 70 to 80°C (158 to 176°F)
(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 : Replace the PCM.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 7. Measure the sensor output voltage at PCM
connector D-135 by backprobing.
(1) Do not disconnect connector D-135.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 119 and ground by
backprobing.
• When transmission fluid temperature is 20°C (68°F),
voltage should measure between 3.8 and 4.0 volts.
• When transmission fluid temperature is 40°C (104°F),
voltage should measure between 3.2 and 3.4 volts.
• When transmission fluid temperature is 80°C (176°F),
voltage should measure between 1.7 and 1.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?
YES : Go to Step 6.
NO : Go to Step 8.
AC204681AB
CONNECTOR: D-135
D-135 (GR)
91 92
93
101
94 95
96 97 98 99 100
102103
104
105106
107108 109
110 111112
113114
115116 117
118 119120
AC204918 BR
D-135 HARNESS CONNECTOR :
HARNESS SIDE
116
97
103
104
112
110 111
106
94 95
98
102
101
100
99
109
115
107
119 120
96
105
91
113
108
117
93
92
114
118
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 8. Check PCM connector D-135 and intermediate
connector E-114 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 9.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC204681AB
CONNECTOR: D-135
D-135 (GR)
91 92
93
101
94 95
96 97 98 99 100
102103
104
105106
107108 109
110 111112
113114
115116 117
118 119120
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
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 9. Check the harness for a short circuit to ground
between A/T control solenoid valve connector C-03
terminal 1 and PCM connector D-135 terminal 119.
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair or replace the harness wire.
AC204395
CONNECTOR : C-03
AE
C-03 (B)
6
10
4
9
5
3
8
2
7
1
AC204681AB
CONNECTOR: D-135
D-135 (GR)
91 92
93
101
94 95
96 97 98 99 100
102103
104
105106
107108 109
110 111112
113114
115116 117
118 119120
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