Geely Emgrand X7. Manual part — 200

4. Diagnostic

Steps:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and
analyze the accuracy of the data, as these will help with quick diagnosis.

Step 1

Initial Inspection

(a) Inspect the fuel injector harness connector for damage, poor connection, aging or signs of

loosening

Step 2

Measure the fuel injector resistance.

(a) Disconnect the fuel injector harness connector EN12.

(b) Measure resistance between the two fuel injector terminals.

Standard Resistance

11.4-12.6Ωwith 20℃（68℉

(c) Connect the fuel injector harness connector EN12.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect cylinder No.2 fuel

injector harness connector EN12.

(c) Rotated ignition switch to ON

position .

(d)

Measure voltage between
cylinder No.2 fuel injector wiring
harness connector EN12 No.A
terminal and a reliable ground.

Standard Voltage: 11-14V

(e) Connect cylinder No.2 fuel

injector harness connector EN12.

NL02-2082b

A

B

EN12 2缸燃油喷射器线束连接器

A

3

Measure Fuel Injectors Working power supply

No

Go to step 5

Yes

No

Refer to 2.2.8.2 “Replacement of Fuel
Injectors” to replace the fuel injectors

Yes

Next

EN12 2nd cylinderfuel injector

799

(a) Rotated ignition switch to OFF

position.

(b) Disconnect cylinder No.2 fuel

injector harness connector EN12.

(c) Connect a light-emitting diodes

test lamp to the fuel injector
wiring harness connector EN12
terminal No.A and B.

(d) Start

the

engine.

(e) Observe whether test lamp is

flashing.

Is test lamp flashing as normal?

NL02-2083b

A

B

EN12 2缸燃油喷射器线束连接器

A

B

Step 5

Inspect and repair cylinder No.2 fuel injector power supply circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the fuel injector

harness connector EN12.

(c) Dismantle the engine main relay.

(d) Measure resistance between

cylinder No.2 fuel injector wiring
harness connector EN12 terminal
No.B and engine main relay
terminal No.30.

(e) Measure resistance between

cylinder No.2 fuel injector wiring
harness connector EN12 terminal
No.B and a reliable ground.

ER03

85

86

87

30

30

87

86

85

ER05

30

87

86

85

ER06

30

87

87a

86

85

ER11

ER08

ER0

9

85

86

87

30

ER10

2

1

5

3

2

1

5

3

2

1

5

3

ER04

ER02

2

1

5

3

2

1

5

3

ER01

ER07

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

EF0

3

EF0

6

EF0

9

EF2

5

EF1

7

EF1

6

EF1

5

EF3

5

EF2

1

EF

1

4

EF

0

1

EF

0

2

EF

0

4

EF

1

0

EF

1

1

EF

1

8

EF

2

4

NL02-0045c

Step 4

Inspect the fuel injector control circuit.

Go to step 6

Go to step 7

No

Yes

EN12 2nd cylinderfuel injector

800

NL02-2082b

A

B

EN12 2缸燃油喷射器线束连接器

A

Standard Resistance

Test Items

Standard Value

EN12(b) and main relay No,30 terminal

Less than 1 Ω

EN12(b) and reliable grounding

10 kΩ or higher

(f) Install the engine main relay.

(g) Connect cylinder 2 fuel injector wire harness connector EN12.

Exclude the fuel injector power supply circuit fault.

Step 6

Inspect the Cylinder #2 fuel injector control circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect cylinder No.2 fuel

injector harness connector EN12.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between

cylinder No.2 fuel injector wiring
harness connector EN12 terminal
No.A and ECM harness
connector terminal No.66.
Inspect whether the circuit is
open. If there is no open circuit,
repair the faulty part.

NL02-2085b

A

B

EN12 2缸燃油喷射器线束连接器

B

Go to step 9

Next

EN12 2nd cylinderfuel injector

EN12 2nd cylinderfuel injector

801

(e) Measure resistance between

cylinder No.2 fuel injector wiring
harness connector EN12 terminal
No.A and a reliable ground.
Inspect whether the circuit is
short to ground. Otherwise,
repair the faulty part.

(f)

Measure voltage between
cylinder No.2 fuel injector
harness connector EN12 terminal
No.A and a reliable ground.
Inspect whether the circuit is
short to power supply. Otherwise,
repair the faulty part.

NL02-2086b

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

8

Test Items

Standard Value

EN12(A)-EN01(63)Resistance value

Less than 1 Ω

EN12(A)-reliable grounding resistance value

10 kΩ or higher

EN12(A)-Reliable grounding voltage value

0V

Execute next step as per normal.

Step 7

Inspect the ECM Power Supply Circuits.

(a) Inspect whether ECM power supply circuit is normal.

(b) Inspect whether ECM ground circuit is normal.

Step 8

Replace ECM

Refer to 2.12.7.11 Crankshaft Position Sensor (CKP) Learn to carry out the crankshaft position
sensor learn after replacing the ECM.

Step 9

Use a fault diagnosis tester to confirm whether the DTC Code is stored again.

Next

No

Repair the faulty part.

Yes

Next

EN01 engine control module harness

connector

802