Mitsubishi Grandis. Manual — part 867

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-135

STANDARD HYDRAULIC PRESSURE
TABLE

NOTE: When the torque converter 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

Selecto
r lever
positio
n

Shift
position

Engine
speed
(r/min)

Underdriv
e clutch
pressure
[UD]

Reverse
clutch
pressure
[RV]

Overdrive
clutch
pressure
[OD]

Low-
reverse
brake
pressure
[LR]

Second
brake
pressure
[2ND]

Torque
converter
pressure
[DR]

P

−

2,500

−

−

−

0.31

− 0.39 −

0.22

− 0.36

R

Reverse 2,500

−

1.27

− 1.77 −

1.27

− 1.77 −

0.50

− 0.70

N

−

2,500

−

−

−

0.31

− 0.39 −

0.22

− 0.36

Sport
mode

1st gear

2,500

0.95

− 1.06 −

−

0.95

− 1.06 −

0.50

− 0.70

2nd gear 2,500

0.95

− 1.06 −

−

−

0.95

− 1.06 0.50 − 0.70

3rd gear 2,500

0.78

− 0.88 −

0.78

− 0.88 −

−

−

4th gear

2,500

−

−

0.78

− 0.88 −

0.78

− 0.88 −

Trouble 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 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, L, M
Malfunction of the underdrive solenoid valve
Malfunction of the underdrive pressure control valve
Malfunction of the check ball
Clogged orifice
Incorrect valve body installation
Malfunction of the accumulator for underdrive clutch

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-136

Only reverse clutch hydraulic pressure is
abnormal.

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

Only overdrive clutch hydraulic pressure is
abnormal.

Malfunction of the oil seal D, E, 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
Malfunction of the accumulator for overdrive clutch

Only low-reverse brake hydraulic pressure is
abnormal.

Malfunction of the oil seal I, J
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 balls
Clogged orifice
Incorrect valve body installation
Malfunction of the accumulator for low-reverse brake

Only second brake hydraulic pressure is
abnormal.

Malfunction of the oil seal G, H, Q
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
Malfunction of the accumulator for second brake

Only torque converter pressure is abnormal.

Clogged oil cooler
Malfunction of the oil seal N
Malfunction of the damper clutch control solenoid
Malfunction of the damper 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

Trouble symptom

Probable cause

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-137

OIL SEAL LAYOUT

AC103760

A

B

C

D

E

F G

H

I

J

K

L

M

N

O

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-138

HYDRAULIC CIRCUIT

M1231008800392

LINE PRESSURE ADJUSTMENT

M1231001700424

1. Drain the transmission fluid.

NOTE: The hydraulic pressure test must be
performed before attempting any adjustments.

2. Remove the valve body cover.

AC311873AB

27

1

6

11

10

17

13

18

19

20

21

24

23

26

28

29

25

22

14

15

16

7

8

9

7

7

7

2

3

4

5

12

RN

P

D

1.

Reverse clutch

2.

Low-reverse brake

3.

Second brake

4.

Underdrive clutch

5.

Overdrive clutch

6.

Damper clutch

7.

Accumulator

8.

Fail-safe valve A

9.

Fail-safe valve B

10. Damper clutch control valve
11. Switch valve
12. Cooler
13. Low-reverse pressure control valve
14. Second pressure control valve
15. Underdrive pressure control valve
16. Overdrive pressure control valve
17. Damper clutch control solenoid valve
18. Low-reverse solenoid valve
19. Second solenoid valve
20. Underdrive solenoid valve

21. Overdrive solenoid valve
22. Torque converter pressure control valve
23. Regulator valve
24. Manual valve
25. Oil pump
26. Oil strainer
27. Oil filter
28. Oil pan
29. Relief valve