Specifications
AUTOMATIC TRANSMISSION -
Troubleshooting
23-28
INSPECTION PROCEDURE 2
Starting impossible
Probable cause
Starting is not possible when the selector lever is in P or N range.In such cases,
the cause is probably a defective engine system, torque converter or oi l pump.
D Malfunction of the engine system
D Malfunction of the torque converter
D Malfunction of the oil pump
L
: Refer to the Transmission Workshop Manual.
Check the engine system.
D Control system, ignition system, fuel system, main engine
system
NG
Repair, replace
OK
Torque converter check
D Check for incorrect installation (inserted at an angle, etc.) and
for damaged splines.
NG
Repair if possible. If the splines are damaged and repairs are not
possible, replace the torque converter assembly.
OK
Repalce the oil pump assembly. L
(The oil pump cannot be disassembled.)
INSPECTION PROCEDURE 3
Does not move (forward)
Probable cause
If the vehicle does not move forward when the selector lever is shifted from N to
D, 3, 2 or L range while the engine is idling, the cause is probably abnormal line
pressure or a malfunction of the underdrive clutch or valve body.
D Abnormal line pressure
D Malfunction of the underdrive solenoid valve
D Malfunction of the underdrive clutch
D Malfunction of the valve body
L
: Refer to the Transmission Workshop Manual.
MUT-
II
Actuator test
D No. 2 Underdrive solenoid valve
OK:
Sound of operation can be heard.
NG
Replace the solenoid valve. L
OK
Hydraulic pressure test (Refer to P.23-56.)
D Measure the hydraulic pressure for each element when in L
range.
Standard value:
Refer to P.23-57.
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
Underdrive clutch system check L
D Remove the transmission assembly, valve body cover and valve
body.
D Pistons should operate and pressure should be maintained
when air is blown through the underdrive clutch oil hole in the
transmission case.
OK
NG
Underdrive clutch check L
D Check for burning of the facing, defective piston seal rings
and interference at the retainer.