Mitsubishi Montero (2004+). Manual — part 863

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-27

STANDARD HYDRAULIC PRESSURE TEST

NOTE: When the torque converter clutch pressure is measured, the engine speed should be 1,500 r/min or
less.

HYDRAULIC PRESSURE TEST DIAGNOSIS TABLE

MEASUREMENT CONDITION STANDARD HYDRAULIC PRESSURE MPa (psi)

TRANS-
MISSION
RANGE

SHIFT
POSI-
TION

ENGINE
SPEED
(r/min)

UNDER-
DRIVE
CLUTCH
PRES-
SURE [UC]

REVERSE
CLUTCH
PRES-
SURE
[RC]

OVER-
DRIVE
CLUTCH
PRES-
SURE [OC]

DIRECT
CLUTCH
PRES-
SURE [DC]

LOW-
RE-
VERSE
BRAKE
PRES-
SURE
[LB]

SECOND
BRAKE
PRES-
SURE [2B]

REDUC-
TION
BRAKE
PRES-
SURE
[RB]

TORQUE
CON-
VERTER
CLUTCH
PRES-
SURE
[TR]

P

−

2,500

−

−

−

−

0.26

−

0.36 (38
− 52)

−

0.26

−

0.36 (38
− 52)

0.22

−

0.36 (32
− 52)

R

Reverse

2,500

−

1.27

−

1.77 (185
− 256)

−

−

1.27

−

1.77 (185
− 256)

−

1.27

−

1.77 (185
− 256)

0.50

−

0.73 (73
− 106)

N

−

2,500

−

−

−

−

0.26

−

0.36 (38
− 52)

−

0.26

−

0.36 (38
− 52)

0.22

−

0.36 (32
− 52)

Sport
mode

1st gear

2,500

0.98

− 1.05

(142

− 152)

−

−

−

0.98

−

1.05 (142
− 152)

−

0.98

−

1.05 (142
− 152)

0.50

−

0.73 (73
− 106)

2nd gear 2,500

0.98

− 1.05

(142

− 152)

−

−

−

−

0.98

− 1.05

(142

− 152)

0.98

−

1.05 (142
− 152)

0.50

−

0.73 (73
− 106)

3rd gear

2,500

0.78

− 0.90

(113

− 131)

−

0.78

− 0.90

(113

− 131)

−

−

−

0.78

−

0.88 (113
− 128)

0.45

−

0.72 (65
− 104)

4th gear

2,500

0.78

− 0.90

(113

− 131)

−

0.78

− 0.90

(113

− 131)

0.78

− 0.88

(113

− 128)

−

−

−

0.45

−

0.72 (65
− 104)

5th gear

2,500

−

−

0.78

− 0.90

(113

− 131)

0.78

− 0.88

(113

− 128)

−

0.78

− 0.88

(113

− 128)

−

0.45

−

0.72 (65
− 104)

SYMPTOM

PROBABLE CAUSE

All hydraulic pressures are high.

Malfunction of the regulator valve

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

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-28

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

Only direct clutch hydraulic pressure
is abnormal.

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

SYMPTOM

PROBABLE CAUSE

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-29

.

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.

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 clutch pressure
is abnormal.

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

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

SYMPTOM

PROBABLE CAUSE

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-30

OIL SEAL LAYOUT

AC100422

N A B C D E F G H I

J K

L

M

T S

R

Q

O

P

V

U

AB

a

a

SECTION a - a