Mitsubishi Montero (2002-2004). Manual - part 896

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-67

.

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 output 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.

.

DTC SET CONDITIONS
If the output from the output shaft speed sensor is 
continuously 50 percent lower than the vehicle speed 
for one second or more while driving in 3rd or 4th 
gear at a speed of 30 km/h (19 mph) or more, it is 
judged that an open circuit or short circuit in the out-
put shaft speed sensor circuit and DTC 23 is set. If 
DTC 23 is set consecutively four times, the transmis-
sion is locked into 3rd gear or 2nd gear as a fail-safe 
measure, and the "N" range light flashes once per 
second.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set:)

• Malfunction of the output shaft speed sensor

• Malfunction of the output shaft 

• Damaged harness, connector

• Malfunction of the PCM

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

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-68

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 23: 
Output Shaft Speed Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to data reading mode for item 23, 

Output Shaft Speed Sensor.

• When driving at constant speed of 50 km/h (31 mph), 

the display should be "1,400 

− 1,700 r/min". (Gear 

range: 4th gear)

(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 

P.00-6

.

NO :  Go to Step 2.

STEP 2. Measure the power supply voltage at output shaft 
speed sensor connector C-02.
(1) Disconnect connector C-02 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 3 and ground.

• The voltage should measure battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?

YES : Go to Step 5.
NO :  Go to Step 3.

ACX01539AD

MB991502

16-PIN

AC204746

CONNECTOR : C-02

C-02 (GR)

AB

1 2 3

AC204918 AH

C-02 HARNESS CONNECTOR : 
COMPONENT SIDE

1

2

3

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-69

STEP 3. Check joint connector D-01, junction block 
connector D-212 and intermediate connector E-11 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 4.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-

2

.

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

AC204173

CONNECTOR : D-212

AZ

3

10

9

4

11

8

7

1

5

2

6

JUNCTION BLOCK
(FRONT VIEW)

AC204176

CONNECTOR : E-11

AZ

3

10

16

9

7 8

6

1

4

2

5

11

14

1213

15

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-70

STEP 4. Check the harness for open circuit or short circuit 
to ground between output shaft speed sensor connector 
C-02 terminal 3 and the junction block connector D-212 
terminal 9.
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair or replace the harness wire.

STEP 5. Measure the PCM to speed sensor output voltage 
at the output shaft speed sensor connector C-02.
(1) Disconnect connector C-02 from the speed sensor and 

measure voltage at the harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 2 and ground.

• The voltage should measure between 4.5 and 4.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 11.
NO :  Go to Step 6.

AC204746

CONNECTOR : C-02

C-02 (GR)

AB

1 2 3

AC204173

CONNECTOR : D-212

AZ

3

10

9

4

11

8

7

1

5

2

6

JUNCTION BLOCK
(FRONT VIEW)

AC204746

CONNECTOR : C-02

C-02 (GR)

AB

1 2 3

AC204918 AG

C-02 HARNESS CONNECTOR : 
COMPONENT SIDE

1

2

3