Mitsubishi Eclipse. Manual — part 781

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-133

DESCRIPTIONS OF MONITOR METHODS

• <If open circuit occurs during driving test> If

abruptly reduced output revolution is detected
during driving test, and a difference between tur-
bine revolution and that value calculated from
output revolution equals or exceeds specified
value, PCM judges that output shaft speed sen-
sor has a failure.

• <If open circuit occurs with vehicle stopped, and

driving test is started> If there is no detection
pulse from output shaft speed sensor (output
rotation) even when engine revolution and turbine
revolution both equal or exceed specified value,
PCM judges that output shaft speed sensor has a
failure.

.

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 22 (P0715): Input shaft speed sensor mal-

function

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

noid malfunction

• DTC 31 (P0753): Low and reverse solenoid mal-

function

• 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

• Torque converter clutch solenoid

• Low and reverse solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

.

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

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

• Input speed: 1,000 r/min or more.

• Engine speed: 1,000 r/min or more.

• Transmission fluid temperature sensor voltage:

4.5 volts or less.

• Calculated slip (engine speed - input speed): 100

r/min or more.

Judgement Criteria

• Output speed: no signal change. (4 seconds)

Yes

No

No

AC212030

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

Yes

N

OPG-B

< (N

IPG-A

- 200 r/min) / I

Continuous failure for 4 secs.

Good

Malfunction

END

Yes

Yes

No

N

OPG-B

: Output speed

(output shaft speed sensor)

No

Yes

N

OPG-B

< -31.9 r/min / 16 msec.

N

IPG-A

> 500 r/min

No

No

No

No

Yes

N

IPG-A

> 1,000 r/min

No

Yes

N

E

> 1,000 r/min

No

Yes

N

E

> N

IPG-A

+ 100 r/min

Yes

Pulses of output shaft
speed sensor are not
inputted

Malfunction

Yes

Continuous failure
for 4 secs.

Good

N

OPG-B

: Output speed change

N

IPG-A

: Input speed

(input shaft speed sensor)

I

:

Gear ratio

AB

-18.5

AUTOMATIC TRANSAXLE DIAGNOSIS

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• If DTC 23 (P0720) is set consecutively four times,

the transaxle is locked into 3rd gear or 2nd gear
as a fail-safe measure, and the "N" range light
flashes once per second.

Check Conditions

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

• Input speed: 500 r/min or more.

• Transmission fluid temperature sensor voltage:

4.5 volts or less.

• Rapid output speed change: -18.5 r/min / 0.016

second or less.

Judgement Criteria

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

ratio] or less. (4 seconds)

• If DTC 23 (P0720) is set consecutively four times,

the transaxle 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, and drive for 5 seconds, with 1st
gear fixed (L range or 1st gear in sport mode), at 20
km/h (12 mph) or more with 50% or more of acceler-
ator pedal depressing. Then stop the vehicle, and
drive again for 5 seconds, with 1st gear fixed (L
range or 1st gear in sport mode), at 20 km/h (12
mph) or more with 50% or more of accelerator pedal
depressing.

.

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

• Malfunction of the output shaft speed sensor

• Malfunction of the transfer drive gear or driven

gear

• Damaged harness or 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 the data reading mode for item

23: Output Shaft Speed Sensor.

• When driving at a constant speed of 50 km/h (31 mph),

the display should be "1,600

− 1,900 r/min." <2.4L

Engine>, "1,100

− 1,600 r/min." <3.0L Engine> (Gear

range: 3rd gear)

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor within the specified range?

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.00-6

.

NO : Go to Step 2.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824

AUTOMATIC TRANSAXLE DIAGNOSIS

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STEP 2. Measure the power supply voltage at the output
shaft speed sensor connector B-38.
(1) Disconnect connector B-38 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.

AC001837AI

CONNECTOR: B-38

B-38

ACX02134 AO

B-38 HARNESS
CONNECTOR:
COMPONENT SIDE