Specifications

AUTOMATIC TRANSMISSION -
Troubleshooting
23-29
INSPECTION PROCEDURE 4
Does not reverse
Probable cause
If the vehicle does not reverse when the selector lever is shifted from N to R range
while the engine is idling, the cause is probably abnormal pressure in the reverse
clutch or low and reverse brake or a malfunction of the reverse clutch, low and reverse
brake or valve body.
D Abnormal reverse clutch pressure
D Abnormal low and reverse brake pressure
D Malfunction of the low and reverse solenoid valve
D Malfunction of the reverse clutch
D Malfunction of the low and reverse brake
D Malfunction of the valve body
L
: Refer to the Transmission Workshop Manual.
MUT-
II
Actuator test
D No. 1 Low and reverse solenoid valve
OK:
Sound of operation can be heard.
NG
Replace the low and reverse solenoid valve. L
OK
Hydraulic pressure check (Refer to P.23-56.)
D Measure the reverse clutch pressure in R range.
Standard value:
Refer to P.23-57.
NG
OK
Hydraulic pressure check (Refer to P.23-56.)
D Measure the low a nd reverse brake pressure in R range.
Standard value:
Refer to P.23-57.
NG
OK
Reverse clutch system and low and reverse brake 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 reverse clutch oil hole and the
low reverse brake oil hole in the transmission case.
OK
NG
Reverse clutch and low and reverse brake check L
D Check for burning of the facing, defective piston seal rings
and interference at the retainer.
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.
INSPECTION PROCEDURE 5
Does not move (forward or reverse)
Probable cause
If the vehicle does not move forward or reverse when the selector lever is shifted
to any position while the engine is idling, the cause is probably abnormal line pressure,
or a malfunction of the power train, oil pump or valve body.
D Abnormal line pressure
D Malfunction of power train
D Malfunction of the oil pump
D Malfunction of the valve body
L
: Refer to the Transmission Workshop Manual.
Hydraulic pressure check (Refer to P.23-56.)
D Measure the hydraulic pressure for each element when moving
forward and back.
Standard value:
Refer to P.23-57.
OK
Power train check L
D Disassemble the transmission, check the condition of the
planetary carrier, output shaft an d dif ferential, etc.
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.