Mitsubishi MOTORS Space Runner 1998, Workshop Manual

Page: 491 / 1164

AUTOMATIC TRANSMISSION -
Troubleshooting
23-31
INSPECTION PROCEDURE 10
Shocks when changing from N to D, N to R and large time
lag Probable cause
If abnormal shocks or a time lag of 2 seconds or more occur when the selector
lever is shifted from N to D range and from N to R range while the engine is idling,
the cause is probably abnormal line pressure or a malfunction of the oil pump or
valve body.
D Abnormal line pressure
D Malfunction of the oil pump
D Malfunction of the valve body
OK
When does the shock occur?
When
starting
Valve body disassembly, cleaning and reassembly L
D Pay particular attention to loosening of bolts, and to damage
and slippage of O-rings, valves and valve bodies.
D If the damage cannot be repaired, replace the valve body
assembly.
L
: Refer to the Transmission Workshop Manual.
Hydraulic pressure test (Refer to P.23-55.)
D Measure the hydraulic pressure for each element when in D
range and R range.
Standard value:
Refer to P.23-56.
NG
Adjust the line pressure. (Refer to P.23-61.)
NG
When shifting
Replace the oil pump assembly. L
(The oil pump cannot be disassembled.)
INSPECTION PROCEDURE 11
Shocks and running up Probable cause
If shocks occur when driving due to upshifting or downshifting and the transmission
speed becomes higher than the engine speed, the cause is probably abnormal line
pressure or a malfunction of a solenoid valve, oil pump, valve body or of a brake
or clutch.
D Abnormal line pressure
D Malfunction of each solenoid valve
D Malfunction of the oil pump
D Malfunction of the valve body
D Malfunction of each brake or each clutch
L : Refer to the Transmission Workshop Manual.
MUT- II Actuator test
D No. 1 Low and reverse solenoid valve
D No. 2 Underdrive solenoid valve
D No. 3 Second solenoid valve
D No. 4 Overdrive solenoid valve
OK:
Sound of operation can be heard.
NG
Replace the solenoid valve.
OK
Adjust the line pressure. (Refer to P.23-61.)
NG
Replace the oil pump assembly. L
(The oil pump cannot be disassembled.)
NG
Valve body disassembly, cleaning and reassembly L
D Pay particular attention to loosening of bolts, and to damage
and slippage of O-rings, valves and valve bodies.
D If the damage cannot be repaired, replace the valve body
assembly.
OK
Clutch and brake check L
D Check for burning of the facing, defective piston seal rings
and interference at the retainer.