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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