CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual
The main oil circuit does not have normal oil
pressure.
Replace the valve plate assembly.
The tim ownshift valve don’t
work no
Replace the val . e control valve and d
rmally.
ve plate assembly
Replace clutch A. Clutch A is damaged.
Replace the transmission assembly if necessary.
Replace 4 -3 gearshift valve sp
spring.
th rd
indle and Clutch A and 4 -3 gearshift valve cable do
work normally.
th rd
not
.
Replace the valve plate assembly if necessary
The en when downshift
from 4
have normal cavity
pressure.
s.
gine has a too high RPM
th
to 3
rd
gear.
The worm wheel does not Inspect and repair the ventilation pipe
Fault ana
Fault description
lysis when the control handle is a
Fault diagnosis Actions.
t Position 2
2
nd
gear brake valve does not work normally. bly. Replace the valve plate assemThe forced braking does not have good effect
when downshift from 4
th
to 3
rd
gear. .
The governor does not work normally. Replace the governor.
Replace the brake C’. No engine braking. The brake C’ is damaged.
Replace the transmission assembly if necessary.
Fault analysis when the control handle is at Position 1
Fault diagnosis Actions. Fault description
Replace 1
st
/back gear brake valve spindle and
spring.
1
st
gear/back gear brake valve does not work
normally.
Replace the transmission assembly if necessary.
The forced braking does not have goo
when kickdown from 2
nd
to 1
st
gear.
d
ally.
effect
The governor does not work norm Replace the governor.
Replace the brake D. No engine braking. The brake D is damaged.
Replace the transmission assembly if necessary.
Other common fault analysis
Fault diagnosis Actions. Fault description
The positioning end of the throttle cable skids. Install correctly the cable’s positioning end or replace
the cable.
The throttle cable’s bushing has too high friction. Replace the throttle cable.
Throttle cable is difficult to operate.
The governor’s hydraulic valve is obstructed. Replace the valve plate assembly.
Replace clutch A. Clutch A is damaged.
Replace the transmission assembly if necessary.
Replace the snap ring or O ring on the worm. The snap ring or O ring on clutch A’s worm is damaged.
Replace the transmission assembly, if necessary.
Replace the O-ring on piston A.
Replace piston A, if necessary.
Slide or shake when parking.
O ring on piston A is damaged.
Replace the transmission assembly, if necessary.
Shuttle valve A is damaged. Replace the valve plate assembly.
Shuttle valve’s spring is damaged. Replace the valve plate assembly.
Replace clutch A. Clutch A is damaged.
Replace the transmission assembly, if necessary.
Shake when shifting from neutral to
rd th
Replace the valve plate assembly
drive
3
-4 gear cable’s ball end is leaking.
Abnormal noise and slow engagement when the speed
is higher.
The oil pan’s oil feed filter screen is obstructed. Replace oil feed filter screen.
Replace the targeted wheel. The targeted wheel is damaged.
Replace the transmission assembly, if necessary.
Replace the oil pump.
No drive or back gear, loud noise.
The oil pump is damaged.
ission assembly, if necessary. Replace the transm
The fluid level is too low. Fill oil to the correct level. Abnormal noises at all gear positions.
bly leaks. Replace the control valve plate assemThe control valve plate assem bly.
Abno mal noises when the oil pump
sucks the oil
The oil pan’s oil feed filter screen is obstructed. r Replace the oil feed filter screen.
The pretension on main back output gear’s bearing is not
Adjust the pretension on bearin
output gear. adjusted correctly or has been changed.
g of the main back
Replace the transmission assembly, if necessary.
Adjust the pretension on the differential’s bearing.
Abnormal noises at shift.
The differential’s bearing pretension isn’t adjusted correctly or has been changed.
Replace the transmission assembly, if necessary.
37
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