Geely Emgrand X7. Manual part — 437

8.3.7 Diagnostic Information and Procedures

8.3.7.1 Diagnosis descriptions

-Refer to 8.3.2 Description and Operation, get familiar with the system functions and operation before starting
-system diagnosis, so that it will help to determine the correct diagnostic steps, more importantly, it will also help
-to determine whether the situation described by the customer is normal.

8.3.7.2 Visual inspection

-Inspect the after-sales optional device which may affect the performance of A/C system.

-Inspect the parts and circuits of A/C system which are accessible and easy to be seen, to find out -whether there is
any damage or possible cause to fault.

-Inspect the pipelines which are accessible and easy to be seen, to find out whether there is any leakage of A/C
system.

8.3.7.3 A/C control module terminal list

空调控制模块线束连接器

IP27

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15 16

NL08-2016b

Note: unless otherwise specified, GND is 0V or close to 0V.

Terminal
No .

Terminal Definition

Diameter/Color

Terminal
Status

Specified Conditions
(Voltage, Current,
Waveform, etc.)

1

Ground

0.3B

Output

GND DC signal

2 -

-

-

-

3

Blower starting signal (-)

0.3W

Input

GND DC signal

4 -

-

-

-

5 -

-

-

-

6

A/C Output

0.3L

Input

GND DC signal

7

Ignition Switch

0.3R

Input

A627 A628 DC signal

8

Battery

0.3R/Y

Output

A627 A628 DC signal

9 Lamplet

(-)

0.3B

Output

DC

signal

10

Engine Speed Signal

0.3W

Input

Pulse signal

11

Rear defrost signal

0.3O

Input

A627 A628 DC signal

IP27 air conditioningcontrol module harness

connector

1747

12 Rear

defrost

output 0.3R/L

Output

A627 A628 DC signal

13 -

-

-

-

14 -

-

-

-

15 -

-

-

-

16

Lamplet (+)

0.3L

Input

A627 A628 DC signal

空调控制模块线束连接器

IP26

3

2 1

6 5 4

NL08-2017b

Terminal
No.

Terminal
definition

Diameter/color

Terminal
status

Specified conditions (voltage,
current, waveform, etc.)

1

Gear 4

3.0B/R

Output

DC signal

2

Gear 2

3.0Br/O

Output

DC signal

3 Ground 3.0B

Output

DC

signal

4 3rd

gear 3.0L

Input

DC

signal

5 -

-

- -

6

1st gear

3.0W

Output

DC signal

IP26 air conditioningcontrol module harness

connector

1748

8.3.7.4 A/C clutch do not work

Circuit diagram:

Refer to 8.3.6.2 A/C system circuit diagram

Diagnostic Steps:

1

Perform the maintenance procedures according to the symptom list.

A. Repair according to the following list of symptoms

Symptoms

Suspected fault part

Maintenance scheme

The engine
coolant
temperature is too
low.

1. ECT sensor fault
2. ECT sensor harness fault
3. Engine cooling system work is in big

circulation state

4. ECM

malfunction

1. Repair

ECT

harnesses

2. Replacement
3. Replace

the

thermostat

4. Overhaul

ECM

,if

necessary ,replace

Abnormal A/C
pressure switch
signal

1. Pressure switch shows signal that A/C

pressure doesn't meet standard value

2. Pressure switch harnesses fault.
3. ECM

malfunction

1. Repair harnesses of pressure

switch

2. Replace

pressure

switch.

3. Overhaul

ECM

,if

necessary ,replace

Outdoor
temperature sensor
signal is abnormal.

1.

Outdoor temperature sensor shows
temperature lower than 4℃.

2. Fault of outdoor temperature sensor

harnesses.

3. A/C control module fault

1. Repair harnesses of outdoor

temperature sensor

2. Replace outdoor temperature

sensor

3. Overhaul A/C control module, if

necessary,replacet

Evaporator
temperature sensor
signal is abnormal.

1. Evaporator temperature sensor display

temperature below 2℃(35.6℉)

2. Evaporator

temperature sensor harness fault

3. A/C control module fault

1. Evaporator

outdoor

temperature

sensor harness

2. Replace evaporator termperature

sensor.

3. Overhaul A/C control module, if

necessary,replacet

Refrigerant
pressure is
abnormal

1. A/C high-presure exceeds 3.14MPa

(455.4psi)

2. Low pressure of A/C is less than

0.196MPa(28.4psi)

1. Residual refrigerant added during

emission.

2. Repair fault which caused

vehicle's bad radiation.

3. bad working condition of engine.
4. Inspect and repair fault which air

conditoning system is blocked.

5. Detecting and Eliminating

Leakage in A/C System

b. Confirm that the malfunctions are fixed.

Does the A/C clutch operate normally?

No

Yes

The system is normal.

1749

2 Check

compressor

fuse

(a) Inspect compressor fuse EF09.

Fuse rated value:10A

Whether fuse is broken or not?

NL08-2020b

ER03

85

86

87

30

30

87

86

85

ER05

30

87

86

85

ER06

30

87

87 a

86

85

ER11

ER08

ER09

85

86

87

30

4

ER10

2

1

5

3

4

2

1

5

3

4

2

1

5

3

ER04

4

ER02

2

1

5

3

4

2

1

5

3

ER01

ER07

4

2

1

5

3

1

2

3

4

11

12

13

14

15

16

5

6

7

8

9

10

EF

0

8

EF

0

7

EF

2

7

EF

2

6

EF

2

2

EF

2

9

EF

0

3

EF

0

6

EF

0

9

EF

2

5

EF

1

7

EF

1

6

EF

1

5

EF

3

5

EF

2

1

EF1

4

EF0

1

EF0

2

EF0

4

EF1

0

EF1

1

EF1

8

EF2

4

3

Repair the compressor clutch power supply circuit.

A. Service whether the power supply line of the compressor clutch is short circuited to the ground.

Does the A/C clutch operate normally?

4

Detect the voltage of the power end of the compressor clutch.

A. Start the engine and press the A/C control switch

(A/C switch) to test the voltage of the supply
terminal EN06-1 of the compressor clutch.

Standard Voltage: 11-14 V

Is voltage the dtandard value?

NL08-2005b

EN06压缩机线束连接器

1

Yes

No

Go to step 4

No

Yes

The system is normal.

No

Yes

Replace compressor clutch

EN06compressorharness connector

1750