Mitsubishi L200. Manual — part 304

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-123

All hydraulic pressures are low.

Malfunction of the oil pump
Clogged internal oil filter
Clogged oil cooler
Malfunction of the regulator valve
Malfunction of the relief valve
Incorrect valve body installation
Improperly installed solenoid valves
Damaged solenoid valve O-rings

Hydraulic pressure is abnormal in reverse
gear only.

Malfunction of the regulator valve
Clogged orifice
Incorrect valve body installation

Hydraulic pressure is abnormal in 3rd or 4th
gear only.

Malfunction of the overdrive solenoid valve
Malfunction of the overdrive pressure control valve
Malfunction of the regulator valve
Malfunction of the switch valve
Clogged orifice
Incorrect valve body installation

Only underdrive clutch hydraulic pressure is
abnormal.

Malfunction of the oil seal K
Malfunction of the oil seal L
Malfunction of the oil seal M
Malfunction of the oil seal Q
Malfunction of the underdrive solenoid valve
Malfunction of the underdrive pressure control valve
Malfunction of the check ball
Clogged orifice
Incorrect valve body installation

Only reverse clutch hydraulic pressure is
abnormal.

Malfunction of the oil seal A
Malfunction of the oil seal B
Malfunction of the oil seal C
Clogged orifice
Incorrect valve body installation

Only overdrive clutch hydraulic pressure is
abnormal.

Malfunction of the oil seal D
Malfunction of the oil seal E
Malfunction of the oil seal F
Malfunction of the overdrive solenoid valve
Malfunction of the overdrive pressure control valve
Malfunction of the check ball
Clogged orifice
Incorrect valve body installation

Trouble symptom

Probable cause

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-124

Only direct clutch hydraulic pressure is
abnormal. <5A/T>

Malfunction of the oil seal R
Malfunction of the oil seal S
Malfunction of the oil seal T
Malfunction of the low-reverse solenoid valve (Shared with
direct clutch)
Malfunction of the low-reverse pressure control valve
Malfunction of the switch valve
Malfunction of the fail safe valve C
Clogged orifice
Incorrect valve body installation

Only low-reverse brake hydraulic pressure is
abnormal.

Malfunction of the oil seal I
Malfunction of the oil seal J
Malfunction of the oil seal P
Malfunction of the low-reverse solenoid valve
Malfunction of the low-reverse pressure control valve
Malfunction of the switch valve
Malfunction of the fail safe valve A
Malfunction of all the check ball
Clogged orifice
Incorrect valve body installation

Only second brake hydraulic pressure is
abnormal.

Malfunction of the oil seal G
Malfunction of the oil seal H
Malfunction of the oil seal O
Malfunction of the second solenoid valve
Malfunction of the second pressure control valve
Malfunction of the fail safe valve B
Clogged orifice
Incorrect valve body installation

Only reduction brake hydraulic pressure is
abnormal. <5A/T>

Malfunction of the oil seal U
Malfunction of the oil seal V
Malfunction of the reduction solenoid valve
Malfunction of the reduction pressure control valve
Clogged orifice
Incorrect valve body installation

Only torque converter pressure is abnormal.

Clogged oil cooler
Malfunction of the oil seal N
Malfunction of the damper clutch control solenoid valve
Malfunction of the damper clutch pressure control valve
Clogged orifice
Incorrect valve body installation

Trouble symptom

Probable cause

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-125

Pressure applied to element which should not
receive pressure.

Incorrect transmission control cable adjustment
Malfunction of the manual valve
Malfunction of the check ball
Incorrect valve body installation

Trouble symptom

Probable cause

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-126

OIL SEAL LAYOUT
<4A/T>

AC904046AB

N A B C D

E F

G

H I

J

K

L

M

Q

O

P