Mitsubishi Montero (2004+). Manual — part 879
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-91
DTC 23 (P0720): Output Shaft Speed Sensor System
AC205190 AC
Output Shaft Speed Sensor System Circuit
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-92
AC204746
CONNECTOR : C-02
C-02 (GR)
AB
1 2 3
AC204170
CONNECTOR : D-01
CD
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
AC204681AC
CONNECTOR: D-134
D-134 (GR)
61 62
63 64
65 66 67 68 69 70 71 72 73
82
89
81
88
80
79
78
77
87
86
85
76
75
74
84
83
AC204191
CONNECTORS : D-208, D-212
5 6
2
4
3
1
JUNCTION BLOCK
(FRONT VIEW)
3
10
9
4
11
8
7
1
5
2
6
D-208
D-208
D-212
D-212
AS
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-93
.
CIRCUIT OPERATION
• The output shaft speed sensor generates a 0 ⇔ 5
volt pulse signal when the output shaft rotates.
The pulse signal frequency increases with a rise
in output shaft speed.
• The output shaft speed sensor is connected to
the PCM (terminals 73 and 88) via the output
shaft speed sensor connector (terminals 1 and 2).
• The PCM detects the output shaft speed by the
signal input to terminal 73.
• The output shaft speed sensor generates the
pulse signal as the teeth of the output shaft pass
the magnetic tip of the sensor.
.
DESCRIPTIONS OF MONITOR METHODS
During driving test at more than specified speed, if
vehicle speed calculated from output revolution is
below half of vehicle speed from vehicle speed sen-
sor, PCM judges that output shaft speed sensor cir-
cuit is open.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (OTHER
MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• DTC 29 (P0500): Vehicle speed sensor malfunc-
tion
Sensor (The sensor below is determined to be
normal)
• Vehicle speed sensor
.
AC204194
CONNECTORS : E-11, E-114
3
10
16
9
7 8
6
1
4
2
5
11
14
1213
15
BC
E-11
E-114
E-11
E-114
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
TSB Revision
AUTOMATIC TRANSMISSION
23A-94
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Transmission range switch position: D.
• Vehicle speed: 30 km/h (19 mph) or more.
• Transmission fluid temperature sensor voltage:
4.5 volts or less.
Judgement Criteria
• Output shaft speed sensor signal: [0.5 × calcu-
lated output speed derived from vehicle speed] or
less. (4 seconds)
• If DTC 23 (P0720) is set consecutively four times,
the transmission is locked into 3rd gear or 2nd
gear as a fail-safe measure, and the "N" range
light flashes once per second.
.
OBD-II DRIVE CYCLE PATTERN
Start the engine, shift to 3rd gear or higher, and drive
at 40 km/h (25 mph) or more for 4 seconds.
.
No
No
AC205225
N
E
:
Engine speed
START
Yes
No
Transmission fluid
temperature sensor
voltage < 4.5 V
Transmission range
switch position is in
D, 3, 2 or L range
Shift stage is 1st or 2nd
and N
E
< 2,600 r/min
Vehicle speed > 30 km/h (19 mph)
Yes
No
Yes
Yes
N
OPG-B
< 0.5 × corresponding output
speed derived from vehicle speed
Continuous failure for 4 secs.
Good
Malfunction
END
Yes
No
Yes
No
N
OPG-B
: Output speed
(output shaft speed sensor)
AB
Transmission range
switch position is in
D range
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