Mitsubishi Grandis. Manual — part 835

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-7

TROUBLESHOOTING <A/T>

STANDARD FLOW OF DIAGNOSIS
TROUBLESHOOTING

M1231013500472

DIAGNOSIS FUNCTION

M1231019000237

N RANGE LAMP SYSTEM

If there is a problem with any of the A/T system, the
N range lamp will flash at a rate of approximately
once per second.
If the N range lamp is flashing at a rate of
approximately once per second, check the diagnosis
output.

N range lamp flashing item

• Input shaft speed sensor system

• Output shaft speed sensor system

• Solenoid valve system

• Non-synchronization at various shift ranges

• A/T control relay system

Ask about trouble symptoms

Check the A/T fluid

Check the trouble symptoms

Replace the A/T fluid

To INSPECTION CHART FOR
TROUBLE SYMPTOMS

Reading of a diagnosis code

Erase of a diagnosis code

Check the trouble symptoms

Inhibitor switch, TPS check

Road test

Recheck diagnosis codes

To INSPECTION CHART FOR
DIAGNOSIS CODES

To INSPECTION CHART FOR
TROUBLE SYMPTOMS

Check for the cause

Repair

Confirmation test (road test)

INTERMITTENT MALFUNCTIONS
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunction)

Completed

NG

OK

Communication with the
MUT-II not possible

Diagnosis code output
exists

No diagnosis code output

Abnormality exists (no diagnosis code output)

Abnormality exists
(diagnostic trouble
code output)

No abnormality

Found

Not found

OK

OK

NG

AC212495

NG

Diagnosis code output
exists

No diagnosis code output

Communication with the
MUT-III not possible

AC311593AB

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-8

NOTE: If the "N" range lamp is flushing
approximately twice per second, the A/T fluid
temperature is high. (It flushes when the fluid is
approximately 125

°

C or more and goes off when the

fluid is approximately 115

°

C or less).

METHOD OF READING THE DIAGNOSIS
CODE

Use the MUT-III to read the diagnosis code (Refer to
GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

METHOD OF ERASING THE DIAGNOSIS
CODE

Use the MUT-III to erase the diagnosis code (Refer
to GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

HOW TO INITIALISE A/T LEARNING
VALUE

M1231022600024

AIM

The use of EEPROM has enabled the A/T learned
value to be retained even after the battery terminals
are disconnected. However, the learned value should
be initialised if the A/T assembly, the engine
assembly, the valve body assembly or the solenoid
valves are replaced. The initialization procedure is as
below:

INITIALIZATOIN PROCEDURE

1. Shift the selector lever to the P range and turn the

ignition switch to the LOCK (OFF) position. Then,
connect the MUT-III to the diagnosis connector.

2. Initialize the learned value on the initializaion

screen.

3. After this initialization, make the system learn the

idling in accordance with "Learning procedure for
idling in MPI engine" (Refer to GROUP 00

−

Precautions before Service

P.00-18

).

ROAD TEST

M1231007800485

Proced
ure

Pre-test/opera
tion
conditions

Test/operation

Judgment value

Check
item

Diagnosis
code No.

Inspection
procedure
if there is
an
abnormalit
y

1

Ignition switch:
LOCK (OFF)
position

Ignition switch

(1) ON

Data List No.54

(1) System voltage

[V]

A/T
control
relay

54

A/T control
relay
system

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-9

2

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

Selector lever
position

(1) P
(2) R
(3) N
(4) D

Data List No.61

(1) P
(2) R
(3) N
(4) D

Inhibitor
switch

27, 28

Inhibitor
switch
system

Selector lever
position

(1) D
(2) Select the sport

mode

(3) Upshift and hold

the selector lever
in that position
(2nd gear)

(4) Downshift and

hold the selector
lever in that
position (1st gear)

Data List No.67

(1) OFF
(2) ON
(3) ON
(4) ON

Select
switch

−

Sport mode
switch
system

Data List No.68

(1) OFF
(2) OFF
(3) ON
(4) OFF

Upshift
switch

Data List No.69

(1) OFF
(2) OFF
(3) OFF
(4) ON

Downshift
switch

Shift indicator lamp

(1) Only D

illuminates

(2) Only 1

illuminates

(3) Only 2

illuminates

(4) Only 1

illuminates

Shift
indicator
lamp

Accelerator pedal

(1) Fully closed
(2) Depressed
(3) Fully opened

Data List No.11

(1) 300

− 700 mV

(2) Gradually

increases from
(1)

(3) 4,000 mV or

more

TPS

−

TPS
system

Brake pedal

(1) Depressed
(2) Released

Data List No.26

(1) ON
(2) OFF

Stop lamp
switch

26

Stop lamp
switch
system

3

Ignition switch:
START

Starting test at P or
N position

Starting should be
possible

Starting
possible/n
ot
possible

−

Starting not
possible

Proced
ure

Pre-test/opera
tion
conditions

Test/operation

Judgment value

Check
item

Diagnosis
code No.

Inspection
procedure
if there is
an
abnormalit
y

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-10

4

Driving after
engine has
warmed up

Drive for 15 minutes
or more until the A/T
fluid temperature
rises to 70

− 80 °C.

Data List No.15
Gradually rises to 70
− 80 °C

A/T fluid
temperatu
re sensor

15, 16

A/T fluid
temperatur
e sensor
system

Proced
ure

Pre-test/opera
tion
conditions

Test/operation

Judgment value

Check
item

Diagnosis
code No.

Inspection
procedure
if there is
an
abnormalit
y