Mitsubishi Space Star. Manual - part 114
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-23
INSPECTION PROCEDURE 6
Engine stalling during shifting
Probable cause
If the engine stalls when the selector lever is shifted from N to D or R range while
the engine is idling, the cause is probably a malfunction of the engine system, damper
clutch solenoid valve, valve body or torque converter (damper clutch malfunction).
Malfunction of the engine system
Malfunction of the damper clutch control solenoid
valve
Malfunction of the valve body
Malfunction of the torque converter (Malfuction of the
damper clutch)
: Refer to the Transmission Workshop Manual.
Engine system check
Check the control system, ignition system, fuel system and
main system.
NG
Repair, replace
OK
Replace the damper clutch control solenoid valve.
Valve body disassembly, cleaning and reassembly
Pay particular attention to loosening of bolts, and to damage
and slippage of O-rings, valves and valve bodies.
If the damage cannot be repaired, replace the valve body
assembly.
NG
Repalce the torque converter.
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
INSPECTION PROCEDURE 7
Shocks when changing from N to D and large time lag
Probable cause
If abnormal shocks or a time lag of 2 seconds or more occur when the selector
lever is shifred from N to D range while the engine is idling, the cause is probadly
abnormal underdrive clutch pressure or a malfuntion of the underdrive clutch, valve
body, APS.
Abnormal underdrive clutch pressure
Malfunction of the underdrive solenoid valve
Malfunction of the underdrive clutch
Malfunction of the valve body
Malfunction of the APS
YES
OK
Hadraulic pressure test (Refer to P.23-51.)
Measure the underdrive clutch pressure when shifting from
N to D.
Standard valve: Refer to P.23-52.
MUT-
II
Actuator test
No.2 Underdrive solenoid valve
OK: Sound of operation can be heard.
Replace the underdrive solenoid valve.
OK
NG
NG
When starting
Shocks sometimes occur
When does the shock occur?
When starting
MUT-
II
Data list
No.11 APS
OK: The value should increase gradually when the accelerator
pedal is depressed slightly from the fully closed position.
Code Nos. 11, 12, 14 APS system check (Refer to P.23-12.)
Underdrive clutch system check
Remove the transmission assembly, valve body cover and
valve body.
Pistons should operate and pressure should be maintained
when air is blown through the underdrive clutch oil hole in
the transmission case.
NO
OK
NG
Valve body disassembly, cleaning and reassembly
Pay particular attention to loosening of bolts, and to damage
and slippage of O-rings, valve and valve bodies.
If the damage cannot be repaired, replace the valve body
assembly.
Underdrive clutch check
Check for burning of the facing, defective piston seal rings
and interference at the retainer.
OK
NG
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.