Mitsubishi Space Star. Manual - part 121

 

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Mitsubishi Space Star. Manual - part 121

 

 

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-51

HYDRAULIC PRESSURE TEST

1.

Warm up the engine until the A/T fluid temperature is
70  – 80



C.

2.

Jack up the vehicle so that the wheels are free to turn.

3.

Connect the special tools (2,942 kPa oil pressure gauge
[MD998330] and joints [MD998332, MD998900]) to each
pressure discharge port.

NOTE
2ND: Second brake pressure port
UD: Underdrive clutch pressure port
LR: Low & reverse brake pressure port
DR: Torque converter pressure port
RV: Reverse clutch pressure port
OD: Overdrive clutch pressure port

4.

Measure the hydraulic pressure at each port under the
conditions given in the standard hydraulic pressure table,
and check that the measured values are within the standard
value ranges.

5.

If a value is outside the standard range, correct the problem
while referring to the hydraulic pressure test diagnosis
table.

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-52

STANDARD HYDRAULIC PRESSURE TEST

Measurement condition

Standard hydraulic pressure kPa

Selector
lever
position

Shift posi-
tion

Engine
speed
(r/min)

Under-
drive
clutch
pressure

Reverse
clutch
pressure

Overdrive
clutch
pressure

Low and 
reverse
brake
pressure

Second
brake
pressure

Torque
converter
pressure

P

2,500

310 – 390

500 – 700

R

Reverse

2,500

1,320 –
1,720

1,320 –
1,720

500 – 700

N

2,500

310 – 390

500 – 700

Sport
mode

1st gear

2,500

1,010 –
1,050

1,010 –
1,050

500 – 700

2nd gear

2,500

1,010 –
1,050

1,010 –
1,050

500 – 700

3rd gear

2,500

590 – 690

590 – 690

4th gear

2,500

590 – 690

590 – 690

AUTOMATIC TRANSMISSION – 

On-vehicle Service

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-53

HYDRAULIC PRESSURE TEST DIAGNOSIS TABLE

Trouble symptom

Probable cause

All hydraulic pressures are high.

Incorrect transmission control cable adjustment

Malfunction of the regulator valve

All hydraulic pressures are low.

Incorrect transmission control cable adjustment

Malfunction of the oil pump

Clogged internal oil filter

Clogged external oil filter

Clogged oil cooler

Malfunction of the regulator valve

Malfunction of the relief valve

Incorrect valve body installation

Hydraulic pressure is abnormal
in “R” range only

Malfunction of the regulator valve

in “R” range only.

Clogged orifice

Incorrect valve body installation

Hydraulic pressure is abnormal
in “3” or “4” range only

Malfunction of the overdrive solenoid valve

in “3” or “4” range only.

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 hydraulic 
pressure is abnormal

Malfunction of the oil seal K, L, M

pressure is abnormal.

Malfunction of the underdrive solenoid valve

Malfunction of the underdrive pressure control valve

Malfunction of check ball

Clogged orifice

Incorrect valve body installation

Only reverse clutch hydraulic
pressure is abnormal

Malfunction of the oil seal A, B, C

pressure is abnormal.

Clogged orifice

Incorrect valve body installation

Only overdrive hydraulic 
pressure is abnormal

Malfunction of the oil seal D, E, F

pressure is abnormal.

Malfunction of the overdrive solenoid valve

Malfunction of the overdrive pressure control valve

Malfunction check ball

Clogged orifice

Incorrect valve body installation

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-54

Trouble symptom

Probable cause

Only low and reverse hydraulic
pressure is abnormal

Malfunction of the oil seal I

pressure is abnormal.

Malfunction of the oil seal J

Malfunction of the low and reverse solenoid valve

Malfunction of the low and reverse pressure control valve

Malfunction of the switch valve

Malfunction of the fail safe valve A

Malfunction of check ball

Clogged orifice

Incorrect valve body installation

Only second hydraulic pressure
is abnormal

Malfunction of the oil seal G, H, O

is abnormal.

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 torque converter pressure
is abnormal

Malfunction of the oil cooler

is abnormal.

Malfunction of the oil seal N

Malfunction of the damper clutch control solenoid valve

Malfunction of the damper clutch control valve

Malfunction of the torque converter pressure control valve

Clogged orifice

Incorrect valve body installation

Pressure applied to non 
operating element

Incorrect transmission control cable adjustment

operating element.

Malfunction of the manual valve

Malfunction of check ball

Incorrect valve body installation

 

 

 

 

 

 

 

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