Mitsubishi Montero Sport (2004+). Manual — part 632

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

23A-93

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

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

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)

AUTOMATIC TRANSMISSION DIAGNOSIS

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DTC SET CONDITIONS

Check Conditions

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

• 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.

.

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

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Using scan tool MB991958, check data list item 23:
Output Shaft Speed 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 data reading mode.

• 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: 3rd 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.00-7

.

NO : Go to Step 2.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

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STEP 2. Measure the power supply voltage at output shaft
speed sensor connector B-15.

(1) Disconnect connector B-15 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.

STEP 3. Check intermediate connector C-30 and junction
block connector D-13 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

.

AC202387

1 2 3

CONNECTOR: B-15

B-15 (GR)

AB

ACX02134 AK

B-15 HARNESS CONNECTOR:
COMPONENT SIDE

AC202367

JUNCTION BLOCK (REAR)

4

3

10 11

9

8

5

12

1
6

2
7

19 20

6

17

7

5

15

14

16

8

18

3

11 12

4

2

10

1

9

13

CONNECTORS: C-30, D-13

D-13

D-13

C-30

C-30

AB

AUTOMATIC TRANSMISSION DIAGNOSIS

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STEP 4. Check the harness for open circuit or short circuit
to ground between output shaft speed sensor connector
B-15 terminal 3 and junction block connector D-13 terminal
11.

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 output shaft speed sensor connector B-15.

(1) Disconnect connector B-15 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.

AC202387

1 2 3

CONNECTOR: B-15

B-15 (GR)

AB

AC202368

JUNCTION BLOCK
(REAR)

19 20

6

17

7

5

15

14

16

8

18

3

11 12

4

2

10

1

9

13

CONNECTOR: D-13

D-13

AB

AC202387

1 2 3

CONNECTOR: B-15

B-15 (GR)

AB

ACX02135

B-15 HARNESS CONNECTOR:
COMPONENT SIDE

AK