Great Wall Hover. Manual — part 29
Automatic transmission-47
4. Operating mode of transmission
TCU realizes the effective control for the transmission according to the accurate information acquired form the input data and
complete control for the output data. To ensure the input and output of TCU is actual and effective, TCU executes the data sense
command for hardware and software. For the failure information found in the following operating mode described in detail, TCU
will give the corresponding response.
Similarly, it exists the possibility that could not find out the failure cause. If encounter the condition, the operation for transmis
sion is determined difficultly.
Following condition will effect the operation of transmission, but will not appear the detection failure information.
a. Power supply failure
The transmission adopts the 3-Gear lame Home Mode (LHM) irrelevant to car speed.
If occur the intermittent power supply, then TCU will start form 4-Gear and is switched to the proper gear to meet the
requirement of current work. At this time, it will not monitor the power supply status.
b. The transmission fluid temperature is higher than 135
If found the transmission temperature is high:
The torque converter lock clutch will start in low speed and the car will have the vibration.
Some cars will have the condition that the mode indicator lamp is flash.
The reason for the condition may be the transmission fluid temperature is high or acquire the inaccurate single form the
temperature sensor. If occurs the temperature failure, it may find the high temperature operating condition.
c. Failure of ON/OFF solenoid valve
If one of the solenoid valves has the mechanical failure, TCU will not find the failure. At this time, the failure operation of
transmission will be determined according to the solenoid valve with failure. The characteristic of different solenoid valve failure
is listed in Table 6.1.2.
reverse pin
gear indication pin
Gear sensor(black)
Figure 6.1.1 Description for wire bundle pin
Automatic transmission-48
solenoid
valve
Condition Transmission
operation
1
Opened
always
1st-Gear replaces 2nd-Gear; 4th-Gear replaces 3rd-Gear. It causes the car form the G ear shift of 1
→1→4→4 when accelerate form static. The transmission stay longer time in Gear; worse 1→4
shift feeling.
Closed
always
2nd-Gear replaces 1st-Gear; 3rd-Gear replaces 4th-Gear. It causes the car form the G ear shift of 2
→2→3→3 when accelerate form static. It is said that starts form 2nd-Gear.
2 Closed
always
4th-Gear replaces 1st-Gear; 3rd-Gear replaces 2nd-Gear. It causes the car form the G ear shift of 2
→2→3→3 when accelerate form static. That is saying that start form 4th-Gear.
Opened
always
2nd-Gear replaces 3rd-Gear; 1st-Gear replace 4th-Gear.
It cause the car is shifted form 1st-Gear to 2nd-Gear, then from 2nd-G ear to Gear when accelerate
form static. It will feel the transmission is in free gear position after 2→1 Gear shift.
1&2
Opened
always
Can not realize the reverse gear; only has 1st-Gear operation.
3
Closed always
Following shifts are bad. (2→3 is worst ):1→3, 1→4, 2→3, 2→4, 4→2, 4→1
Opened
always
Following gear shifts are worse: 3→4, 4→3, 3→2。
It may cause the gear slide when the hydraulic torque converter is locked.
4 Closed
always
Following gear shifts are worse:
1→2, 1→3, 1→4, 2→3, 2→4, 3→1, 3→2, (including manual) 3→4, 4→1, 4→3
Opened
always
Following gear shifts are worse: (1→2 is worst) 2→4, 3→2 It may cause the gear slide when
the hydraulic torque converter is locked.
6
Closed always
The line pressure is high always.
Opened
always
The line pressure is low always. So it cause the slide between gears. The clutch C1 and brake belt
B1 will be burned.
7
Closed always
The hydraulic torque converter is without lock.
Opened
always
The hydraulic torque converter is locked in 3rd-Gear and 4th-Gear. It cause the car generates the
vibration in low-speed status.
Table 6.1.2 Operation of transmission when ON/OFF solenoid valve is faulty
Mechanical detection
1.Inspection of transmission on car
It should process the following detections before disassemble the transmission:
process the on-road drive test to determine the failure cause .(according to requirement)
Detect the standard of transmission fluid. (refer to 7.2.1)
Ensure the transmission fluid in not overheated. (Normal color and smell)
Detect the failure information.
Check the battery terminal and grounding for corrosion or loose.
The engine speed is within the specified value in manual.
Check the cooling system for normal operation.
All power supply and plug wires is tight and not loose.
Check the transmission fluid, ensure the oil pan is without other martial material or pollutant.
2. Oil leakage detection
It should wash the polluted part of the transmission before select the oil leakage part, then drive the car.
When detect the leakage part of the rear servo system, it should lift the car by lifter firstly, then switch the gear to reverse
gear within 10s.
When detect the leakage part of front servo system, it should lift the car by lifter firstly, then switch the gear to gear-2
(winter mode).
The time switched to 2nd-Gear should be no more than 10s to avoid the oil in the torque converter is overheated.
3. FAQ table
Automatic transmission-49
The distribution of FAQ table is shown as follows:
Table 6.2.1 Drive failure
Table 6.2.3 Shift quality failure
Table 6.2.2 Shift mode failure
Table 6.2.4 Disassembly failure
failure Possible
reason
Corresponding
measure
“D”-Gear operation
has not drive
The automatic transmission fluid is insufficient.
The oil-entering of C1/C2 piston is blocked.
The “Z” is assembled incorrectly.
The primary regulating valve plug is opened.
The overspeed shaft or input shaft sealing ring is
failure.
3→4, 1→2 single-way clutch is installed in reverse or
failure.
Check the liquid level. Fill it up if necessary.
Check and wash the C1/C2 oil inlet device.
Reinstall the “Z” connection.
Remove, wash and reinstall the primary
regulating valve.
Check and replace it if necessary.
Check and replace it if necessary.
The reverse shifting
operation is without
drive.
The manual 1
st
-Gear
has not engine
brake.
The engine brake is
normal in manual
1
st
-Gear.
The input shaft oil seal ring is damaged.
The rear brake belt or servo system is faulty.
C3, C3 wheel shaft or C1/C2 cylinder are out of work.
Check and replace it if necessary.
Test the servo system or replace the rear brake
belt according to the requirement.
Test the failure C3, C3 wheel axle or C1/C2
cylinder.
Repair it in time if necessary.
“D” –Gear and reverse
–Gear operation is
without drive.
The primary regulating valve is blocked.
The pump gear is damaged.
Take out the output shaft clasp.
Detect and clean the primary regulating valve.
Check and replace the pump gear if necessary.
Check and repair it if necessary.
Only can 2→3 shifting
(can not realize the
4
th
-Gear and 1
st
-Gear)
S1 is closed always.
Test the S1. Repair or replace it if necessary.
Test the failure of S1 12V power supply
voltage or wire bundle.
Only can 1→4 shifting
1→3→4 shifting (1
→2 shifting delay).
S1 is opened always
Test the S1. Repair or replace it if necessary.
Test the failure of S1 12V power supply
voltage or wire bundle.
Only can 4→3 shifting
S2 is closed always.
Test the S2. Repair or replace it if necessary.
Test the failure of circuit break or wire bundle.
1→2→neutral position
shifting (1
st
-Gear
transition)
S2 is opened always
Test the S2. Repair or replace it if necessary.
Test the failure of circuit break or wire bundle.
Only can 1→3 shifting
B1 is out of work
The brake belt is loose.
The front servo piston or oil seal is out of work.
S1/S2 ball spool is reinstalled in wrong place.
Test and adjust it according to the requirement.
Test and maintain it according to the
requirement.
Test and replace or reinstall it according
to the requirement.
Only can 1→3→4
shifting
The small O-ring of front servo piston is invalid or
lost.
2→3 Gear position shifting valve is blocked.
Detect the O-ring. Process the replacement or
reinstallation if necessary. Detect the 2→3
Gear shifting valve; Process the maintenance
or replacement according to the requirement.
Only can 1→2→1
shifting
C1 is invalid or 3
rd
-Gear and 4
th
-Gear is loose. (give
to 1
st
-Gear in 3
rd
-gear; give to 2
nd
-Gear in 4
th
-Gear)
Detect the clutch C1. Repair or replace it if
necessary.
Can not realize the
manual 4→3, 3→2, 2
→1
Overspeed clutch /ball spool has displacement.
C4 is invalid.
Detect the ball spool. Process the replacement
or reinstallation according to the requirement.
Detect the C4. Repair C4 or replace the C4
wave pan according to the necessary.
Automatic transmission-50
O n ly ca n 1 → 3 → 4
s h if tin g
T h e s m a ll O -rin g o f fr o n t ser v o p is to n is in v a lid o r lo s t.
2 → 3 G ea r p s itio n s h ifti n g v a lv e is b lo ck ed .
D et e ct th e O -r in g . P r o c es s th e rep la c e m e n t o r
r ein s ta lla tio n if n e c es s a ry . D et e ct th e 2 → 3
G ea r s h iftin g v a lv e; P ro c es s th e m a in t en a n c e
o r r ep la c e m en t a c co r d in g t o th e r eq u ir e m e n t.
O n ly ca n 1 → 2 → 1
s h if tin g
C 1 is in v a lid o r 3
rd
- G ea r a n d 4
th
- G ea r is lo o s e . (g iv e t o
1
st
-G ear in 3
rd
-g ea r; g iv e to 2
n d
-G ea r in 4
th
-G ea r)
D et e ct th e clu tc h C 1 . R ep a ir o r r ep la c e it if
n e c es s a r y.
C a n n o t r ea liz e t h e
m a n u a l 4 → 3 , 3 → 2 , 2
→ 1
O v er sp e ed clu tc h /b a ll s p o o l h a s d isp la c e m en t.
C 4 is in v a lid .
D et e ct th e b a ll s p o o l. P r o c es s th e r ep la c e m en t
o r r ein s ta lla tio n a c co r d i n g to th e r eq u ire m e n t.
D et e ct th e C 4 . R ep a ir C 4 o r r ep la c e th e C 4
w a v e p a n a c c o r d in g to th e n e c es sa r y .
W ith o u t m a n u a l
1
st
- G ea r
T h e r ea r b ra k e b e lt is lo o s e w h en th e t e m p era tu r e i s
h ig h .
T h e R -G ea r /L o w s p e e d 1
st
-G ea r b a ll s p o o l h a s
d is p la c e m e n t.
T h e in t ern a l “ O ” – rin g o f r ea r s er v o is l o s t.
C 4 is in v a lid .
D et e ct th e r ea r b ra k e b elt, a d j u s t id n e c es s a ry.
D et e ct t h e b a ll sp o o l, R ein s ta ll o r r ep la c e it if
n e c es s a r y.
D et e ct th e O - rin g , R e in s ta ll o r r ep la c e it if
n e c es s a r y.
D et e ct th e C 4 . R ep a ir o r r ep la c e it if n e c ess a r y.
O n ly ca n 1 → 2 → 2 → 4
g ea r .
T h e d im en s io n o f so ck et o f f ro n t s er v o is la r g e . H a s th e
p o s s ib ilit y o f lo o s e o f p l u g .
It h a s th e tre n d th a t ca n n o t rea liz e th e r e v ers e-G ear if
d riv e th e v e h ic le in th is co n d itio n co n t in u o u sl y .
R ep a ir o r r ep la c e it if n eces s a r y.
D et e ct th e C 3 p is to n O -rin g , r ep la c e it if
n e c es s a r y.
O n ly a n 1
st
- g ea r,
2
n d
-G ea r, 4
th
-G ea r o r
1
st
-G ea r , 2
n d
-G ea r a n d
3
r d
-G ea r.(3
r d
-G ear is
tig h te n ed )
T h e g ea r s e n s o r h a s fa ilu r e, o n ly ca n 1 → 2 → 3 s h iftin g .
3 → 4 G ea r s h iftin g v a lv e is b lo c k ed .
D et e ct th e g ea r- p o s itio n s e n s o r. R ep a ir o r
rep la ce it if n e c es s a ry . D ete ct th e 3 → 4 g ea r
s h iftin g v a lv e. R ep a ir o r r ep la c e it if
n e c ess a r y.
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