Mitsubishi Eclipse. Manual — part 752

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-17

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "ELC-A/T" from the "POWER TRAIN" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code."
8. If a DTC is set, it is shown.
9. Choose "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

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. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "ELC-A/T" from the "POWER TRAIN" tab.
6. Select "MITSUBISHI."
7. Select "Data List."
8. Choose an appropriate item and select the "OK" button.

AC303127

MB991911

16-PIN

MB991827

MB991824

AC303127

MB991911

16-PIN

MB991827

MB991824

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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HOW TO PERFORM ACTUATOR TEST

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

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. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "ELC-A/T" from the "POWER TRAIN" tab.
6. Select "MITSUBISHI."
7. Select "Actuator Test."
8. Choose an appropriate item and select the "OK" button.

AC303127

MB991911

16-PIN

MB991827

MB991824

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-19

FAIL-SAFE/BACKUP FUNCTION

M1231008300212

When a malfunction of a main sensor or actuator is
detected by the PCM, the transaxle is controlled by
pre-set control logic to maintain safe conditions for
driving.

The following table shows how the fail-safe/backup
function affects vehicle driveability and operation.

MALFUNCTIONING ITEM

JUDGEMENT
CONDITION

CONTROL DEFAULT DURING MALFUNCTION

Input shaft speed sensor

If no output pulse from
the input shaft speed
sensor is detected for
one second or more
when the vehicle speed
is 30 km/h (19 mph) or
greater.

The diagnostic trouble code is recorded when the
malfunction occurs during 4 monitoring periods in
one drive cycle. When the judgement condition is
met, the transaxle holds 3rd gear or 2nd gear,
depending on speed, as a fail-safe.

Output shaft speed sensor

The output signal from
the output shaft speed
sensor is not present for
one second or more
while the vehicle is
driven.

Low-reverse solenoid valve

Solenoid valve
resistance is below 2.7
ohms for 0.32 seconds.

The diagnostic trouble code is recorded when the
malfunction occurs during 4 monitoring periods in
one drive cycle. When the judgement condition is
met, the A/T control relay is turned off. The
transaxle will only operate in 3rd and reverse
gears until the system is repaired.

Underdrive solenoid valve
Second solenoid valve
Overdrive solenoid valve
Torque converter clutch
solenoid valve
Incomplete shifting 1st

The gear ratio value
from the output shaft
speed sensor is not the
same as the output from
the input shaft speed
sensor for one second
after shifting has been
completed.

2nd
3rd
4th
Reverse

A/T control relay

A/T control relay voltage
is less than seven volts
for 0.1 second after the
ignition switch is turned
"ON."

The A/T control relay is switched off. The
transaxle will only operate in 3rd and reverse
gears until the system is repaired.

Malfunction in the PCM

Malfunction has
occurred in the PCM.

The A/T control relay is switched off. The
transaxle will only operate in 3rd and reverse
gears until the system is repaired.

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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ROAD TEST

M1231007800377

Check by the following procedures.

STEP

CONDITION
BEFORE TEST/
OPERATION

TEST/OPERATION

STANDARD

INSPECTION
ITEM

DTC

INSPECTION
PROCEDURE
PAGE

Ignition switch:
(LOCK) OFF

Ignition switch
(1) ON

Data list No.54

(1) Control Relay

Voltage [V]

A/T Control
relay output
voltage

A/T Control
relay system
(

P.23A-279

Ignition switch:
ON
Engine: Stopped
Selector lever
position: P

Selector lever
position <Vehicles
without sport
mode>
(1) P, (2) R, (3) N,
(4) D, (5) 3, (6) 2,
(7) L

Data list No.61
(1) P, (2) R, (3) N,
(4) D, (5) 3, (6) 2,
(7) L

Transmission
range switch

27,
28

Transmission
range switch
system
(

P.23A-155

P.23A-192

Selector lever
position <Vehicles
with sport mode>
(1) P, (2) R, (3) N,
(4) D
Selector lever
position <Vehicles
with sport mode>
(1) D (1st gear)
(2) Select the sport
mode (1st gear)
(3) Upshift and hold
the selector lever in
that position (2nd
gear)
(4) Downshift and
hold the selector
lever in that
position (1st gear)