Mitsubishi Galant (2004+). Manual - part 635

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-91

DTC 23 (P0720): Output Shaft Speed Sensor System

POWERTRAIN
CONTROL MODULE

JOINT
CONNECTOR (1)

JUNCTION
BLOCK

IGNITION
SWITCH (IG1)

OUTPUT SHAFT
SPEED SENSOR 

AC209756AC

Output Shaft Speed Sensor System Circuit

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-92

AC306223

A-13 (GR)

AB

CONNECTOR: A-13

1

4

7

8

2 3

5

13

14

17

15

12

16

11

10

9

6

AC306248AE

B-22 
(B)

CONNECTOR: B-22

PCM

AIR
CLEANER

JAE

94

98

107

103

112

91

100

109

101102

106

110

105

111

97

92

96

93

104

113

108

95

99

AC305353AC

CONNECTOR: B-107

BATTERY

B-107 (GR)

3

2

1

AC305231

CONNECTOR: C-01

AS

33

22

11

28

17

16

15

14

13

12

25

2324

2627

3

1 2

4 5

21

20

19

18

29 30

32

31

7

6

8

10

9

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

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 
output shaft speed.

• The output shaft speed sensor is connected to 

the PCM (terminals 112 and 113) via the output 
shaft speed sensor connector (terminals 1 and 
2).

• The PCM detects the output shaft speed by the 

signal input to terminal 112.

• The output shaft speed sensor generates the 

pulse signal as the teeth of the transfer drive gear 
pass the magnetic tip of the sensor.

.

DESCRIPTIONS OF MONITOR METHODS

• <If open circuit occurs during driving test> If 

abruptly reduced output revolution is detected 
during driving test, and a difference between tur-
bine revolution and that value calculated from 
output revolution equals or exceeds specified 
value, PCM judges that output shaft speed sen-
sor has a failure.

• <If open circuit occurs with vehicle stopped, and 

driving test is started> If there is no detection 
pulse from output shaft speed sensor (output 
rotation) even when engine revolution and turbine 
revolution both equal or exceed specified value, 
PCM judges that output shaft speed sensor has a 
failure. 

.

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 22 (P0715): Input shaft speed sensor mal-

function

• DTC 36 (P0743): Torque converter clutch sole-

noid malfunction

• DTC 31 (P0753): Low and reverse solenoid mal-

function

• DTC 32 (P0758): Underdrive solenoid malfunc-

tion

• DTC 33 (P0763): Second solenoid malfunction

• DTC 34 (P0768): Overdrive solenoid malfunction

• DTC 54 (P1751): A/T control relay malfunction

Sensor (The sensor below is determined to be 

normal)

• Input shaft speed sensor

• Torque converter clutch solenoid

• Low and reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

.

AC207134

C-214

C-215

CONNECTORS: C-214, 215

AO

1

3 4

2

6

5

C-214

C-215

6

1

7

2

9

8

10

3

5

12

11

4

1314

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-94

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Transmission range switch position: D, 3, 2 or L.

• Input speed: 1,000 r/min or more.

• Engine speed: 1,000 r/min or more.

• Transmission fluid temperature sensor voltage: 

4.5 volts or less.

• Calculated slip (engine speed - input speed): 100 

r/min or more.

Yes

No

No

AC205226

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

Yes

N

OPG-B

 < (N

IPG-A

 - 200 r/min) / I

Continuous failure for 4 secs.

Good

Malfunction

END

Yes

Yes

No

N

OPG-B 

: Output speed

            (output shaft speed sensor)

No

Yes

N

OPG-B

 < -18.5 r/min / 16 msec.

N

IPG-A

 > 500 r/min

No

No

No

No

Yes

N

IPG-A

 > 1,000 r/min

No

Yes

N

E

 > 1,000 r/min

No

Yes

N

E

 > N

IPG-A

 + 100 r/min

Yes

Pulses of output shaft 
speed sensor are not 
inputted

Malfunction

Yes

Continuous failure 
for 4 secs.

Good

N

OPG-B

 : Output speed change

N

IPG-A 

: Input speed

           (input shaft speed sensor)

I

 : 

Gear ratio

AC

-31.9