Mitsubishi Montero (2004+). Manual — part 921

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-259

LOGIC FLOW CHARTS (Monitor Sequence) <DTC 44 (P0734)>

.

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.

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

> 900 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

4

: 4th g

ear ratio

AC205246

Timer start

Timer > 2 secs.

Voltage of battery > 10 V

Shift stage commanded
by A/T ECM is 4th

No

Yes

Yes

No

I

4

× N

OPG-B

- 200 < N

IPG-A

< I

4

× N

OPG-B

+ 200

AB

Shift stage commanded
by PCM is 4th

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-260

• 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 (4th gear in
sport mode).

.

DESCRIPTIONS OF MONITOR METHODS <DTC
45 (P0735)>
In 5th gear, if a difference between turbine revolution
and that value calculated from output revolution
equals or exceeds specified value, PCM judges that
step-out in 5th gear has occurred.

.

MONITOR EXECUTION <DTC 45 (P0735)>
Continuous

.

MONITOR EXECUTION CONDITIONS (OTHER
MONITOR AND SENSOR) <DTC 45 (P0735)>

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 35 (P0773): Reduction 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

• Reduction solenoid

• A/T control relay

.

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-261

LOGIC FLOW CHARTS (Monitor Sequence) <DTC 45 (P0735)>

.

DTC SET CONDITIONS <DTC 45 (P0735)>

Check Conditions

• Engine speed: 450 r/min or more.

• Output speed: 900 r/min or more.

• Shift stage: 5th 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.

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

> 900 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

5

: 5th g

ear ratio

AC205247

Timer start

Timer > 2 secs.

Voltage of battery > 10 V

Shift stage commanded
by A/T ECM is 5th

No

Yes

Yes

No

I

5

× N

OPG-B

- 200 < N

IPG-A

< I

5

× N

OPG-B

+ 200

AC

Shift stage commanded
by PCM is 5th

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-262

• 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) / 5th

gear ratio] or more. (4 seconds)

• Output speed: [(input speed - 200 r/min) / 5th

gear ratio] or less. (4 seconds)

• If DTC 45 (P0735) 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 45
(P0735)>
Start the engine, and drive at 40 km/h (25 mph) or
more for 10 seconds, with 5th gear fixed (5th gear in
sport mode).

.

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 35 (P0773): Reduction 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

• Reduction solenoid

• A/T control relay

.