Mitsubishi Montero (2004+). Manual — part 919

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-251

STEP 13. Check the harness for an open or short circuit to
ground between A/T control solenoid valve assembly
connector C-03 (terminals 6, 7, 8 and 10) and solenoid
valve connectors C-03-4, C-03-5 and C-03-6.
Q: Is the harness wire in good condition?

YES : Replace the PCM.
NO : Replace the harness wire.

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204749

CONNECTORS : C-03-4, C-03-5, C-03-6

1
2

C-03-4

1
2

C-03-5

1
2

C-03-6

AD

C-03-4

C-03-6

C-03-5

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-252

DTC 41 (P0731): 1st Gear Incorrect Ratio
DTC 42 (P0732): 2nd Gear Incorrect Ratio
DTC 43 (P0733): 3rd Gear Incorrect Ratio
DTC 44 (P0734): 4th Gear Incorrect Ratio
DTC 45 (P0735): 5th Gear Incorrect Ratio
DTC 46 (P0736): Reverse Gear Incorrect Ratio

.

CIRCUIT OPERATION

• The input shaft speed sensor generates a pulsed

signal of 0

⇔ 5 volts. The pulsed signal fre-

quency increases with an increase in the input
shaft speed.

• The PCM (terminal 64) continuously monitors the

input shaft speed signal.

• The output shaft speed sensor generates a

pulsed signal of 0

⇔ 5 volts. The pulsed signal

frequency increases with an increase in the out-
put shaft speed.

• The PCM (terminal 73) continuously monitors the

output shaft speed signal.

.

DESCRIPTIONS OF MONITOR METHODS <DTC
41 (P0731)>
In 1st 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 1st gear has occurred.

.

MONITOR EXECUTION <DTC 41 (P0731)>
Continuous

.

MONITOR EXECUTION CONDITIONS (OTHER
MONITOR AND SENSOR) <DTC 41 (P0731)>

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

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AUTOMATIC TRANSMISSION

23A-253

LOGIC FLOW CHARTS (Monitor Sequence) <DTC 41 (P0731)>

.

DTC SET CONDITIONS <DTC 41 (P0731)>

Check Conditions

• Engine speed: 450 r/min or more.

• Output speed: 350 r/min or more.

• Shift stage: 1st 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

> 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

N

IPG-A

< I

1

× N

OPG-B

- 200

No

Yes

Yes

Malfunction

Shift change is finished

N

IPG-A

: Input speed

(input shaft speed sensor)

I

1

: 1st g

ear ratio

AC205243

Timer start

Timer > 2 secs.

Voltage of battery > 10 V

Shift stage commanded
by A/T ECM is 1st

No

Yes

Yes

No

AB

Shift stage commanded
by PCM is 1st

+

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

23A-254

• 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) / 1st

gear ratio] or less. (4 seconds)

• If DTC 41 (P0731) 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 41
(P0731)>
Start the engine, and drive at 20 km/h (12 mph) or
more for 10 seconds, with 1st gear fixed (1st gear in
sport mode).

.

DESCRIPTIONS OF MONITOR METHODS <DTC
42 (P0732)>
In 2nd 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 2nd gear has occurred.

.

MONITOR EXECUTION <DTC 42 (P0732)>
Continuous

.

MONITOR EXECUTION CONDITIONS (OTHER
MONITOR AND SENSOR) <DTC 42 (P0732)>

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

.