Mitsubishi Eclipse. Manual - part 812

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-257

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 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 TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-258

LOGIC FLOW CHARTS (Monitor Sequence)

.

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 TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-259

• 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 transaxle 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 (L range or 
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 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 TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-260

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS <DTC 42 (P0732)>

Check Conditions

• Engine speed: 450 r/min or more.

• Output speed: 500 r/min or more.

• Shift stage: 2nd 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

 > 500 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

2

 : 2nd g

ear ratio

AC205244

Timer start

Timer > 2 secs.

Voltage of battery > 10 V

Shift stage commanded 
by A/T ECM is 2nd

No

Yes

Yes

No

I

2

 × N

OPG-B

 - 200 < N

IPG-A

 < I

2

 × N

OPG-B

 + 200

AB

Shift stage commanded 
        by PCM is 2nd