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