Geely Emgrand X7. Manual part — 203

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 EN14.

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

Standard Resistance

11.5-12.6Ωwith 20℃（68℉

(c) Connect the fuel injector harness connector EN14.

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect 4-cylinder fuel
injector harness connector EN14.

(c) Rotated ignition switch to ON

position .

(d)

Measure voltage between
cylinder No.4 fuel injector wiring
harness connector EN14 No.A
terminal and a reliable ground.

Standard Voltage: 11-14V

(e) Connect to 4 cylinder fuel

injector harness connector EN14.

NL02-2094b

A

B

EN14 4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

EN14 4th cylinderfuel injector

811

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect 4-cylinder fuel
injector harness connector EN14.

(c) Connect a light-emitting diodes

test lamp to the fuel injector
wiring harness connector EN14
terminal No.A and B.

(d) Start

the

engine.

(e) Observe whether test lamp is

flashing.

NL02-2095b

A

B

EN14 4缸燃油喷射器线束连接器

A

B

Is test lamp flashing as normal?

Step 5

Inspect and repair cylinder No.4 fuel injector power circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the fuel injector

harness connector EN14.

(c) Dismantle the engine main relay.

(d) Measure resistance between

cylinder No.4 fuel injector wiring
harness connector EN14 terminal
No.B and engine main relay
terminal No.30.

(e) Measure resistance between

cylinder No.2 fuel injector wiring
harness connector EN14 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

EN14 4th cylinderfuel injector

812

NL02-2094b

A

B

EN14 4缸燃油喷射器线束连接器

A

Standard Resistance

Test Items

Standard Value

Resistance Between EN14 (b) and Main Relay Terminal No.30

Less than 1 Ω

Resistance Between EN14 (b) and A Reliable Ground

10 kΩ or higher

(f) Install the engine main relay.

(g) Connect cylinder 4 fuel injector wire harness connector EN14.

Exclude the fuel injector power supply circuit fault.

Step 6

Inspect the Cylinder #4 fuel injector control circuit.

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect 4-cylinder fuel
injector harness connector EN14.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between

cylinder No.4 fuel injector wiring
harness connector EN14 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.

NL02-2096b

A

B

EN14 4缸燃油喷射器线束连接器

B

Go to step 9

Next

EN14 4th cylinderfuel injector

EN14 4th cylinderfuel injector

813

(e) Measure resistance between

cylinder No.4 fuel injector wiring
harness connector EN14 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.4 fuel injector
harness connector EN14 terminal
No.A and a reliable ground.
Inspect whether the circuit is
short to power supply. Otherwise,
repair the faulty part.

NL02-2097b

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

25

Test Items

Standard Value

EN14(A)-EN01(26)Resistance value

Less than 1 Ω

Resistance Between EN14 (a) and a Reliable Ground

10 kΩ or higher

Voltage Between EN14 (a) and a Reliable Ground

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.

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.

(a) Connect fault diagnosis tester to the diagnostic interface.

(b) Turn ignition switch to ON position.

Step 8

Replace ECM

No

Repair the faulty part.

Yes

Next

EN01 engine control module harness

connector

814