Great Wall service chassis and body Manual - part 76

BE-33

Body Electric System

 Combination Instrument

Electric circuit diagram (continued)

SF

A 3   c o n n e c t e d
with negative pole

A1  connected
with positive pole

B8 connected
with negative
pole

B7
connected
with positive
pole

A4    connecting
with lighting
switch

A6 connected
with negative
pole

pressure-regulating
potential device

irect-current

power supply

5-9V

drive power

supply

110V

EL

luminous

plate

left turn indicating lamp

right turn indicating lamp

upper beam indicating lamp

rear fog lamp indicating lamp

rear window/defroster indicating lamp

front fog-lamp indicating lamp

water
thermometer

tachometer

connected with sensor

connected with revolution signal

speedometer

digital clock

fuel gauge

connect to the cathode of sensor

connected with sensor anode

connected with sensor

connected with sensor

back door indicating lamp

parking brake indicating lamp

safety airbag indicating lamp

low oil pressure indicating lamp

engine failure indicating lamp

four wheel drive indicating lamp

generator preheating indicating lamp

fuel alarming indicating lamp

accumulator charging indicating lamp

ABS failure indicating lamp

75

B9

B2

A15

B1

A9

B11

B10

A14

B4

B6

A12

B14  connected
with positive
pole

B7  connected
with positive
pole

A11

A5

A7

B12

B5

B13

A16

A13

B16

B15

A2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

In this drawing, A stands for the white plugging

elements, B for black plugging elements, they

use the same numerical order.

instrument

plugging element

BE-34

Body Electric System

 Combination Instrument

Electric circuit diagram (continued)

A16

A1

B16

B1

SL SK

B1

B16

A1

A16

speed and mileage meter

4P

G

V

A9

vehicle speed signal

A11

odometer sensor

A10

odometer sensor anode

B11

sensor signal

electronic tachometer

water thermometer

fuel gauge

coolant temperature sensor

B5

A12

fuel gauge sensor

B14

A2

B3

upper beam

_NP

differential latch-in

safety belt

preheating

sediment water alarming

electricity charging/
discharging

fuel level alarming

brake failure alarming lamp

oil pressure alarming lamp

rear fog lamp

engine failure

four wheel drive indicating lamp

A1   Aturn indicating lamp

B16  left turn indicating lamp

A8

B4   +

B7  -

B8

A16

B15

B2

B1

A15

A14

B6

A13

B10

B9

SY SJ

accumulator plus four door-closing indicating lamp

A3

turn on when the door is opened.

A11

odometer sensor

_NO

electronic odometer

electronic tachometer

A10

B11

engine ignition coil

water thermometer

fuel gauge

B5

A12

neutral gear indicating lamp

A9

_NP

upper beam

B14

differential latch-in

vacuum alarming

preheating

sediment water alarming

electricity charging/
discharging

fuel level alarming

brake failure alarming lamp

oil pressure alarming lamp

rear fog lamp

engine failure

four wheel drive indicating lamp

A1  left turn indicating lamp

B16   right turn indicating lamp

A8

B4  +

instrument lighting

system

B8

B7  -

A16

B15

B2

B1

A15

A14

B6

A13

B9

B3

B10

A2

instrument lighting

system

BE-35

Body Electric System

 Combination Instrument

Common Troubleshooting

a.

Such failures as inaccuracy indication, out-operation of indicator, on the fly of large and small summation meters

(mechanical wheel drive excluded) or incomplete liquid crystal display are caused by the interior failures of the

instrument, therefore, these failures, once occur, should be judged according to the instrument interior failures, and

change the combination instrument directly.

b.

In case both the large and small summation meter and the indicator of electronic odometer are on the fly, such failures

can be removed by disassembling the speed sensor from the whole vehicle first, then connecting the sensor and

combination instruments as shown in the drawing.

Then, open the power supply and run the rotors quickly to observe the indicator variation of odometer.

the odometer indicator

should be no less than 40Km/

h variation in speed under

common condition when

running the rotors,

otherwise,

change with the good sensor

good combination instruments

vÉë

No

Yes

No

Yes

No

installation of sensor

connector for wiring harness

malfunction of sensor

failure of instrument

panel

connector for wiring

harness

12V

combination instrument

signal input

sensor

BE-36

Body Electric System

 Combination Instrument

Normal indicating range of combination instrument indicator

Speedometer

Real speed Km/h

Displayed speedKm/h

20

40

60

80

100

120

140

160

20

 3

40

0

5

60

0

5

Tachometer SY SL

80

0

5

100

0

5

120

0

6

140

0

7

160

0

8

750

1000

2000

3000

4000

5000

6000

750

-10

+20

1000

-10

+50

2000

 120 3000 
 150 4000 
 200

5000

 250 6000 
 300

Real rotating
speedr/min
Displayed rotating
speedr/min

Tachometer Dr SL SK SF

1000

2000

3000

4000

5000

6000

7000

1000

 100 2000 
 200 3000 
 150

4000

 200 5000 
 250 6000 
 300 7000 
 350

Real rotating
speedr/min
Displayed rotating
speedr/min

c.

The inaccuracy display of tachometer is usually caused by the interior failures of tachometer, in such situation,

change the combination directly. As for the good-bad shift or out-operation of tachometer, the failures can be judged

according to the following approaches:

1)

Start the vehicle, then check the voltage of signal input of tachometer (wire harness with multi-meter, the

voltage should be 6 V or so.

2)

In case there is no signal voltage, check the power supply system of the whole vehicle to remove the failures

in circuit.

3)

The plugs of wire harness is only allowed to be inserted in the combination instruments under the condition

that the signal voltage is normal, and the instrument is in normal operation.

4)

Where the instrument is in abnormal operation, such trouble is caused by the failure of combination

instruments, in such case, change the combination instrument directly.

d.

Troubles of fuel gauge and water thermometer

1)

 In case the instrument indicator points to the large number after it is powered, disconnect the sensor from the

plugging elements of wire harness before judging such kinds of troubles, if the indicator is still at large number,

it can be make a judgment that the trouble is caused by the interior failure of instrument, in such case, change

the combination instrument directly; if the indicator returns to the small number, according to which it can be

judged that the trouble is caused by the sensor failure, therefore, change the sensor directly.

2)

where the instrument indicator stands still, such trouble may be caused by three causes probably, interior failure

of sensor, plugging elements of wire harness or interior failure of instrument; the inspection may be conducted

according to the following approaches: disconnect the plugging elements of wire harness from that of sensor,

grounding the wire at the sensor end; in such condition, the indicator should move upwardly to the largest

number; if such phenomena occurs, it can show the trouble is caused by the interior failure of sensor, in such

case, change the sensor directly; if the instrument indicator is still immobilized after it is powered, it can be

judged that the trouble is caused by the interior failure of instrument under the condition that the wire harness

and plugging elements are normal, in such case, change the combination instrument directly.

Fuel gauge Dr SF SY

Displayed oil
volume

Reference
resistance 

Permitted
error 

E

1/2

F

110

38

7

 5

 4

+3

Fuel gauge SJ

Displayed oil
volume
Reference
resistance 

Permitted
error 

E

1/2

F

110

38

7

 12

 4

 2

Fuel gauge SL SK

Displayed oil
volume
Reference
resistance 

Permitted
error 

E

1/2

F

120

45

17

 10

 10 
 10