Mitsubishi Montero Sport (2004+). Manual - part 685

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-305

DTC SET CONDITIONS <DTC 44 (P0734)>

Check Conditions

• Engine speed: 450 r/min or more.

• Output speed: 900 r/min or more.

• Shift stage: 4th gear.

• Input speed: more than 0 r/min.

• Transmission fluid temperature sensor voltage: 

4.5 volts or less.

• Voltage of battery: 10 volts or more.

• Transmission range switch rationality: only one 

signal.

• Time after shift changing finish: 2 seconds or 

more.

Judgement Criteria

• Output speed: [(input speed + 200 r/min) / 4th 

gear ratio] or more. (4 seconds)

• Output speed: [(input speed - 200 r/min) / 4th 

gear ratio] or less. (4 seconds)

• If DTC 44 (P0734) is set consecutively four times, 

the transmission is locked into 3rd gear as a 
fail-safe measure, and the "N" range light flashes 
once per second.

.

OBD-II DRIVE CYCLE PATTERN <DTC 44 
(P0734)>
Start the engine, and drive at 40 km/h (25 mph) or 
more for 10 seconds, with 4th gear fixed (D range).

.

DESCRIPTIONS OF MONITOR METHODS <DTC 
46 (P0736)>
In reverse gear, if a difference between turbine revo-
lution and that value calculated from output revolu-
tion equals or exceeds specified value, PCM judges 
that step-out in reverse gear has occurred.

.

MONITOR EXECUTION <DTC 46 (P0736)>
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor) <DTC 46 (P0736)>

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• DTC 27, 28 (P0705): Transmission range switch 

malfunction

• DTC 22 (P0715): Input shaft speed sensor mal-

function

• DTC 23 (P0720): Output shaft speed sensor mal-

function

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

noid malfunction

• DTC 31 (P0753): Low-reverse solenoid malfunc-

tion

• 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

• Output shaft speed sensor

• Transmission range switch

• Torque converter clutch solenoid

• Low-reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

.

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-306

LOGIC FLOW CHARTS (Monitor Sequence) <DTC 46 (P0736)>

.

Yes

No

No

N

E

 : 

Engine speed

START

Yes

No

Transmission fluid temperature 
sensor voltage < 4.5 V

There is only one transmission 
range switch signal

Yes

N

E

 > 450 r/min

N

OPG-B

 > 350 r/min

N

IPG-A

 > 0 r/min

Continuous failure for 4 secs.

Good

END

N

OPG-B 

: Output speed

            (output shaft speed sensor)

No

Yes

No

No

Yes

No

Yes

Yes

Malfunction

Shift change is finished

N

IPG-A 

: Input speed

           (input shaft speed sensor)

I

r

 : Reverse g

ear ratio

AC205248

Timer start

Timer > 2 secs.

Voltage of battery > 10 V

Shift stage commanded 
by A/T ECM is reverse

No

Yes

Yes

No

I

r

 × N

OPG-B

 - 200 < N

IPG-A

 < I

r

 × N

OPG-B

 + 200

AB

Shift stage commanded 
    by PCM is reverse

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-307

DTC SET CONDITIONS <DTC 46 (P0736)>

Check Conditions

• Engine speed: 450 r/min or more.

• Output speed: 350 r/min or more.

• Shift stage: reverse gear.

• Input speed: more than 0 r/min.

• Transmission fluid temperature sensor voltage: 

4.5 volts or less.

• Voltage of battery: 10 volts or more.

• Transmission range switch rationality: only one 

signal.

• Time after shift changing finish: 2 seconds or 

more.

Judgement Criteria

• Output speed: [(input speed + 200 r/min) / 

reverse gear ratio] or more. (4 seconds)

• Output speed: [(input speed - 200 r/min) / reverse 

gear ratio] or less. (4 seconds)

• If DTC 46 (P0736) is set consecutively four times, 

the transmission is locked into 3rd gear as a 
fail-safe measure, and the "N" range light flashes 
once per second.

.

OBD-II DRIVE CYCLE PATTERN <DTC 46 
(P0736)>
Start the engine, and drive in R range at 15 km/h (9 
mph) or more for 10 seconds.

.

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

• Malfunction of the input shaft speed sensor

• Malfunction of the output shaft speed sensor

• Malfunction of the PCM

• Malfunction of the reverse clutch retainer

• Malfunction of the output shaft

• Malfunction of the low-reverse brake system 

(DTC 41 or DTC 46)

• Malfunction of the underdrive clutch system (DTC 

41, DTC 42, or DTC 43)

• Malfunction of the second brake system (DTC 42 

or DTC 44)

• Malfunction of the overdrive clutch system (DTC 

43 or DTC 44)

• Malfunction of the reverse clutch system (DTC 

46)

• Electrical noise generated

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

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-308

STEP 1. Using scan tool MB991958, read the A/T 
diagnostic trouble code.

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) Turn the ignition switch to the "ON" position.
(3) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC set?

YES <DTC 22 set> : Refer to 

P.23A-69

, DTC 22: Input 

Shaft Speed Sensor System.

YES <DTC 23 set> : Refer to 

P.23A-91

, DTC 23: Output 

Shaft Speed Sensor System.

YES <DTC 31 set> : Refer to 

P.23A-224

, DTC 31: 

Low-Reverse Solenoid Valve System.

YES <DTC 32 set> : Refer to 

P.23A-240

, DTC 32: 

Underdrive Solenoid Valve System.

YES <DTC 33 set> : Refer to 

P.23A-254

, DTC 33: Second 

Solenoid Valve System.

YES <DTC 34 set> : Refer to 

P.23A-268

, DTC 34: 

Overdrive Solenoid Valve System.

NO :  Go to Step 2.

STEP 2. Check the hydraulic pressure.

Each hydraulic pressure of the elements below, which DTCs 
indicate, should be within the standard value. 

P.23A-26

.

• DTC 41: Underdrive clutch and low-reverse brake.

• DTC 42: Underdrive clutch and second brake

• DTC 43: Underdrive clutch and overdrive clutch

• DTC 44: Underdrive clutch and overdrive clutch

• DTC 46: Reverse clutch and low-reverse brake

Q: Does the hydraulic pressures meet the standard value 

range?
YES  : Go to Step 5.
NO <out of the range in one place> : Go to Step 4.
NO <out of the range in all places> : Go to Step 3.

STEP 3. Adjust the line pressure.

Adjust the line pressure. Refer to 

P.23A-39

, Line Pressure 

Adjustment. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO :  Go to Step 4.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN