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Great Wall Hover. Manual - part 28

Automatic transmission-43

Power transmission

Automatic 4

-Gear locking

In automatic 4

–gear locking, the drive of transmission is same as that in automatic 4

–gear basically. But for the application of

variable torque locking clutch, it provides the variable torque drive without slide.

Control:

The automatic 4

–Gear locking is same as that in automatic 4

-Gear basically. But it should be described that when the automatic

-Gear is locked, it has the action for variable torque loop by solenoid valve S7.

When the solenoid valve S7 is opened, the variable torque clutch control valve is closed and allow the S7 loop oil flows to the

drainage port through the solenoid valve S7, then control the valve to move to the clutch engagement position.

The line pressure loop regulating oil from the torque converter clutch regulating valve flows into the combination side of torque

converter clutch directly.

The release oil of torque converter clutch is drained from the control valve of torque converter clutch..

The torque converter loop oil flows into the oil cooler and lubrication loop directly through the control valve of torque

converter clutch..

Refer to Figure 5.9 and Table 5.10.

Table 5.10

The participating condition of each unit in automatic 4

-gear locking

Clutch

Name of participation unit

Automatic transmission-44

Figure 5.9

Automatic 4th –Gear locking

Automatic transmission-45

Diagnosis and test

Test system

1. Recommended test equipment and program

The test equipment and control unit for design will be used for the test of all vehicles. The parts for transmission test includes:

Tester for service after sales
Special vehicle for test

2. Tester for service after sales

After the special programming, the tester equipped with special car test software can be used to test the specified system and unit.
The program allows the normal communication between the transmission control units (TCUs) .
The computer needs the required information from the customer and select the necessary data through the manual. For example:
view the code, clear the error code and make the real-time operation. For detailed operating instruction refer to user’s manual.
The equipment can be used by the trained specialized persons, such as technician, machinist to test the electronic and loop
problem related to transmission. The testable information includes: the engine speed, rode (shaft speed), transmission fluid
temperature, position of throttle position, status of solenoid valve and gear and position of operating lever. Additionally, it can be
used to detect the current and stored problem.

3. Description of TCU pin

The description of TCU pin code had been listed in Table 6.1.1
For description of wire bunch refer to Figure 6.1.1

Pin No.

Function

Type

2WD

description

A14

Public grounding

GND

●

Negative pole of TCU supply, connected to negative pole of

battery.

A13

Nonuse

－－

○

－－－－－

A12

Mode indicator lamp
Snowland mode

●

Indicate that select the “Snowland Mode” operating method.

A11

Parking-Gear indicator lamp

●

The drive instrument panel indicator lamp indicates that is in
the “Parking Gear”

A10

Reverse-Gear indicator lamp

●

The drive instrument panel indicator lamp indicates that is in
“Reverse Gear”

N-Gear indicator lamp

●

The drive instrument panel indicator lamp indicates that is in
“Idle N Gear”

A8 Nonuse

－－

○

－－－－－

A7 Nonuse

－－

○

－－－－－

Mode indicator lamp
dynamic mode

●

Indicate that select the “dynamic mode” operating method.

A5 Nonuse

――

○

－－－

――

A4 Nonuse

――

○

－－－－－

A3 Nonuse

――

○

－－－－－

Mode switch

●

The switch is used to select the “economic mode”, “dynamic
mode” and “snowland mode”. The voltage is variable in
range of 0 V－2V .

A1 Nonuse

――

○

－－－－－

A30

Power supply

PWR

●

Power supply for TCU; is the main power source of drive

unit and solenoid valve.

A29 Nonuse

――

○

－－－－－

A28

-Gear indicator lamp

-Gear position﹡

●

Drive the instrument panel indicator lamp indication, indicate
that the gear-position is in “1

-Gear”

A27

2nd-Gear indicator lamp
/2nd-Gear position

●

Drive the instrument panel indicator lamp indication, indicate
that the gear-position is in “2

-Gear”

A26

-Gear indicator lamp

-Gear position﹡

●

Drive the instrument panel indicator lamp indication, indicate
that the gear-position is in “3

-Gear”

A25

Automatic gear indicator
lamp /4

–Gear position

●

Drive the instrument panel indicator lamp indication, indicate
that the gear-position is in “automatic-Gear”

Automatic transmission-46

P in

N o .

T yp e

2W D

D escrip tion

A2 4 C A N

(-ve )

I/O

○ CAN

h idd en

co m m u nicatio n

end

A2 3 C A N

(+ ve)

I/O

○

C A N e x posed co m m u nicatio n en d

A2 2

K lin e co m m u n ication
connection

I/O

●

D ia gn osis in form ation and c ar code

A2 1 N on use

― ―

○

－－－－－

A2 0 N on use

― ―

○

－－－－－

A1 9

Sh aft speed se nso r
signal

○

T h e senso r send s the sha ft spe ed sign a l to T C U

A1 8 N on use

― ―

○

－－－－－

A1 7 N on use

― ―

○

－－－－－

A1 6 N on use

― ―

○

－－－－－

A1 5 N on use

― ―

○

－－－－－

B 6 G ear-positio n

●

T h e switch  ha s th e variab le-vo ltage ; in dicate the
ge ar-po sition  steerin g  co lu m n  selected  (P R ND 3 21). T he
vo ltage is variab le in  the ran ge o f 0 V --5 V.

B 5

transm ission flu id
te m pe ra ture

●

T h e senso r ind ica te s the  transm ission   flu id  te m pe ra ture.
H igh  R = L o w  tem pe rature
L o w   R =  High   te m p era tu re
T h e  vo ltage  is  varia b le in  the ran ge o f  0 V  to  5 V

B 4 so leno id

va lve

O P

●

N /O FF no rm al-op ened  so leno id  valve , co m b ined  w ith  the
O N /O FF w itch  o f so len oid  valve  3; en sure  the  sh ifting
q ua lity  an d  sequence

B 3 so leno id

va lve

O P

●

O N /O FF n orm al-o pen ed so len oid valve ; co m bined w ith
o the r so leno id va lve; u sed to determ ine the selected
ge ar-po sition .

B 2 N on use

― ―

○

－－－－－

B 1

R e tu rn so len oid va lve
5

●

U sin g fo r groun din g o f V P S a nd curren t o f c ircu it can be
d etected , then process the feedback contro l fo r th e V P S .

B 1 4

G ear-positio n

－

groun din g

G N D

●

P R N D 3 21 Gea r-positio n sw itch groun din g

B 1 3

transm ission flu id
te m pe ra ture －
groun din g

G N D

●

C o nnec te d to ground in g pin o f te m p erature sen so r.

B 1 2 so leno id

va lve

O P

●

O N /O FF no rm al-op ene d so len oid valve, determ in e the
h igh or lo w o f lin e p ressu re

B 1 1 so leno id

va lve

O P

●

O N /O FF norm al-o pened so leno id va lve, co m bined w ith
o the r so leno id valves; u sed to d eterm ine the selected
ge ar-po sition .

B 1 0 so leno id

va lve

O P

●

O N /O FF norm al-o pened  so leno id  va lve, co m bined  w ith
the O N /O FF  sw itch  o f so leno id  va lve 4 ; en sure the
shiftin g  quality  and   seq uence

B 9 so leno id

va lve

O P

●

O N /O FF  n orm a l-o pen ed   so leno id   valve ,  h yd raulic  torq ue
con verter  loc kin g;  in cre ase  th e  e fficienc y  o f  m ed iu m
speed   ru n .

B 8 N on use

― ―

○

－－－－－

B 7 so leno id

va lve

5 (+ve)

O P

●

It is the so leno id va lve w hich can ch an ge th e p ressu re
d urin g the sh iftin g a nd on /o ff o f so leno id valve .

● = connected line                                                        ○ = unconnected line                     ＊ =only
O P =  ou tpu t                                                                    IP =in put                                                I/O = in pu t/o utp ut
G N D = gro und in g                                                            R E F= refere nce                                      P W R=p o w er

Table 6.1.1 Description of TCU pin

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