Mitsubishi L200. Manual - part 277

AC103525

SPECIAL TOOLS

AUTOMATIC TRANSMISSION

23A-15

MD998330 
(including 
MD998331)

Oil pressure gauge (3.0 
MPa)

Hydraulic pressure measurement

MD998332

Adapter

Oil pressure gauge connection

MD998900

Joint

Tool

Number

Name

Use

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-16

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

M1231104000153

 

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
M.U.T.-III not possible

AD

Perform the repair

DIAGNOSTIC FUNCTION

M1231103300151

SELECTOR LEVER POSITION INDICATOR 
LAMP SYSTEM

AC504108AB

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

Selector lever position indicator lamp flashing 

item

• Input shaft speed sensor system

• Output shaft speed sensor system

• Solenoid valves system

• Non-synchronization at various shift ranges

• A/T control relay system

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-17

NOTE: If the A/T fluid temperature warning lamp is 
illuminating, the A/T fluid temperature is high. (It illu-
minates when the fluid is approximately 135

°

C or 

more and goes off when the fluid is approximately 
115

°

C or less.)

METHOD OF READING THE DIAGNOSIS 
CODE

Use the M.U.T.-III to read the diagnosis code. (Refer 
to GROUP 00 

− How to Use Troubleshooting/Inspec-

tion Service Points .)

METHOD OF ERASING THE DIAGNOSIS 
CODE

Use the M.U.T.-III to erase the diagnosis code. 
(Refer to GROUP 00 

− How to Use Troubleshooting/

Inspection Service Points .)

ROAD TEST

M1231100800500

Proced
ure

Pre-test/
operation 
conditions

Test/operation

Judgment value

Check 
item

Diagnosi
s code 
No.

Inspection 
procedure if 
there is an 
abnormality

1

Ignition switch: 
LOCK (OFF) 
position

Ignition switch
(1) ON

Data List No.8

(1) System voltage 

[V]

A/T 
control 
relay

P1788

A/T control 
relay system

TROUBLESHOOTING

AUTOMATIC TRANSMISSION

23A-18

2

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

Selector lever 
position <4A/T>

(1) P 
(2) R
(3) N 
(4) D
(5) 2 
(6) L 

Data List No.34

(1) P 
(2) R
(3) N 
(4) D
(5) 2
(6) L

Inhibitor 
switch

P1770, 
P1771

Inhibitor switch 
system

Selector lever 
position <5A/T>

(1) P 
(2) R
(3) N 
(4) D

Data List No.34

(1) P 
(2) R
(3) N 
(4) D

Selector lever 
position <5A/T>

(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.27

(1) OFF 
(2) ON
(3) ON
(4) ON

Select 
switch

−

Sport mode 
switch system

Data List No.28

(1) OFF 
(2) OFF
(3) ON
(4) OFF

Upshift 
switch

Data List No.29

(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

Overdrive switch 
<4A/T>

(1) ON 
(2) OFF

Data List No.26

(1) ON 
(2) OFF

Overdrive 
switch

−

Overdrive 
switch system

Accelerator pedal

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

Data List No.35

(1) 0%
(2) Gradually 

increases from (1)

(3) 100%

APS

−

Refer to 
GROUP 13A 

− 

Troubleshootin
g.

Transfer shift lever 
position

(1) Except for 4L

Data List No.31

(1) OFF 
(2) ON

4LLc 
switch

−

4LLc switch 
system

Proced
ure

Pre-test/
operation 
conditions

Test/operation

Judgment value

Check 
item

Diagnosi
s code 
No.

Inspection 
procedure if 
there is an 
abnormality