Geely Emgrand X7. Manual part — 220

2.12.7.47 DTC P0641 P0651

1. DTC

description:

DTC P0646

Air-conditioning Clutch Relay Circuit Short to Low Voltage or Open

DTC P0647

Air-conditioning Clutch Relay Circuit Short to High Voltage

The working voltage of the air-conditioning compressor relay is provided by the main relay which
is controlled by ECM. ECM controls Air-Conditioning compressor relay internal ground through
ECM harness connector EN01 terminal No.9, and relay pulls in. ECM has an internal driver
circuit that controls relay coil ground. The driver circuit is equipped with a feedback circuit to
ECM. ECM monitors the feedback voltage control circuit to determine whether the there is an
open circuit, a circuit short to ground or power supply.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

P0646

When air-conditioning is not
working, with air-conditioning
relay control circuit open or
short to ground, the DTC code
will be set.

P0647

Hardware Circuit
Inspection

When air-conditioning is not
working, with air-conditioning
relay control circuit open or
short to ground, the DTC code
will be set.

1. Air Conditioner Relay

2. ECM

3. Air-Conditioning

Relay

Circuit

3. Circuit figure :

Refer to 8.2.6.2 Air-conditioning System Circuit Diagram

4. Diagnostic

Steps:

Refer to 8.2.7.8 Air-conditioning Clutch Inoperation.

879

2.12.7.48 DTC P0685

1. DTC

description:

DTC P0685 Main Relay Malfunction

Main relay is used to provide power to fuel injectors and oxygen sensors and other components.
Battery provides power to main relay terminal No.86. ECM controls main relay ground through
ECM harness connector EM01 terminal No.62. ECM has a detection circuit. By monitoring the
feedback voltage, ECM determines whether the control circuit is open, short to ground or short to
power supply.

2. Conditions For Setting DTC and The Fault Location:

DTC
Code

DTC Detection
Strategy

Conditions For Setting The DTC
(Control Strategy)

Fault Locations

P0685

Main Relay
Malfunction

The main relay control circuit does
not match ECM expected status.

1. Main

Relay

2. Main Relay Circuit

3. ECM

3. Circuit

sketch

NL02-2142b

8

8 EN25

CA22

44

EN01

12

12 EN25

CA22

ECM

BAT

15

A

E

F2

1

86

87

30

85

发动机舱保险丝继电器盒

发动机主继电器

MPR

4. Diagnostic

Steps:

1 Appearance

Inspection

Inspect main relay for signs of damage.

Engine compartment

fuse relay box

Engine main
relay

880

2

Inspect the terminal 87 of the main engine relay.

(a) Turn the ignition switch to "OFF"

position.

(b) Dismantle engine main relay .

(c) Measure voltage between engine

main relay No 87 and reliable
grounding.

Standard Voltage: 11-14V

Confirm whether according with the
standard value?

NL02-2143b

ER03

8 5

8 6

87

3 0

30

8 7

86

8 5

ER05

3 0

87

8 6

8 5

ER06

3 0

8 7

8 7 a

86

85

ER11

ER08

ER

09

8 5

86

8 7

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

EF0

8

EF0

7

EF2

7

EF2

6

EF2

2

EF2

9

EF

0

3

EF

0

6

EF

0

9

EF2

5

EF1

7

EF1

6

EF1

5

EF3

5

EF2

1

EF

14

EF

01

EF

02

EF

04

EF

10

EF

1

1

EF

18

EF

24

8 7

3

Inspect the circuit between the terminal 85 of the main engine relay and the terminal
44 of the EN01.

(a) Turn the ignition switch to "OFF"

position.

(b) Measure resistance between

EN01 terminal 44 and engine
main relay terminal 85.

Standard Value: Less than 1 Ω

Confirm whether according with the
standard value?

NL02-2144b

ER03

8 5

8 6

87

3 0

30

8 7

86

8 5

ER05

3 0

87

8 6

8 5

ER06

3 0

8 7

8 7 a

86

85

ER11

ER08

ER

09

8 5

86

8 7

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

EF0

8

EF0

7

EF2

7

EF2

6

EF2

2

EF2

9

EF

0

3

EF

0

6

EF

0

9

EF2

5

EF1

7

EF1

6

EF1

5

EF3

5

EF2

1

EF

14

EF

01

EF

02

EF

04

EF

10

EF

1

1

EF

18

EF

24

8 5

No

Repair the circuit between the battery and
the terminal 87 of the main engine relay,
and turn to the step 7.

Yes

Yes

Replace main relay ,go to steps10

No

881

NL02-2145b

EN01 发动机控制模块线束连接器

1

2

4

5

3

81

63

44

25

6

62

43

24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

26

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

45

46

61 60 59 58

57 56 55

54 53 52 51 50 49 48 47

64

65

66

80 79 78 77 76 75 74 73 72 71 70 69 68 67

44

4

Inspect the voltage of the terminal 44 of the engine control module wire harness
connector EN01.

(a) Rotated ignition switch to "ON"

position .

(b) Measure voltage between ECM

harness connector EN01 terminal
No.44 and a reliable ground.

Standard Voltage: 11-14V

(c) Rotated ignition switch to "OFF"

position .

Whether voltage value is normal or
not ?

NL02-2045b

EN01 发动机控制模块线束连接器

1

2

4

5

3

81

63

44

25

6

62

43

24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

26

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

45

46

61 60 59 58

57 56 55 54 53 52 51 50 49 48 47

64

65

66

80 79 78 77 76 75 74 73 72 71 70 69 68 67

76

5

Inspect the ECM Power Supply Circuits.

Refer to 2.12.7.43 DTC P0562 P0563.

Inspect whether the ECM power supply circuit and ground circuit are normal.

No

Replace the main engine relay to step 7.

Yes

No

Repair the circuit between the terminal 44
of EN01 and the terminal 85 of the main
engine relay, and turn to the step 7.

Yes

EN01 engine control module harness

connector

EN01 engine control module harness

connector

882