Geely Emgrand X7. Manual part — 56

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

wiring harness connector EM15.

(b) Measure resistance between the

two fuel injector terminals.

Standard Resistance

11.4-12.6Ω @ 20 (68 )

℃

℉

(c) Connect the fuel injector harness

connector EM15.

喷油器2线束连接器 EM15

B

A

NL02-0046c

(a) Rotated ignition switch to OFF position .

(b) Disconnect cylinder No.2 fuel injector wiring harness connector EM15.

(c) Rotated ignition switch to ON position .

(d) Measure voltage between cylinder No.2 fuel injector wiring harness connector EM15 No.A

terminal and a reliable ground.

Standard Voltage: 11-14V

(e) Connect cylinder No.2 fuel injector wiring harness connector EM15.

Step 4

Inspect the fuel injector control circuit.

(a) Rotated ignition switch to OFF position .

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

Oil injecter 2harness connectorEM15

223

(b) Disconnect cylinder No.2 fuel injector wiring harness connector EM15.

(c) Connect a light-emitting diodes test lamp to the fuel injector wiring harness connector EM15

terminal No.A and B.

(d) Start

the

engine.

(e) Observe whether test lamp is flashing.

Is test lamp flashing as normal?

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

wiring harness connector EM15.

(c) Dismantle the engine main relay.

(d)

Measure resistance between
cylinder No.2 fuel injector wiring
harness connector EM15 terminal
No.B and engine main relay
terminal No.30.

ER03

85

86

87

30

30

87

86

85

ER05

30

87

86

85

ER06

30

87

87a

86

85

ER11

ER08

ER

09

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

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

EF

01

EF

02

EF

04

EF

10

EF

1

1

EF1

8

EF2

4

NL02-0045c

(e) Measure resistance between cylinder No.2 fuel injector wiring harness connector EM15

terminal No.B and a reliable ground. Standard Resistance

(f) Install the engine main relay.

(g) Connect cylinder No.2 fuel injector harness connector EM15.

Exclude the fuel injector power supply circuit fault.

Test Items

Standard Value

Resistance Between EM15 (B) and Main Relay Terminal No.30

Less than 1 Ω

Resistance Between EM15 (B) and A Reliable Ground

10 kΩ or higher

Step 6

Inspect the Cylinder #2 fuel injector control circuit.

(a) Rotated ignition switch to OFF position .

(b) Disconnect cylinder No.2 fuel injector wiring harness connector EM15.

(c) Disconnect ECM harness connector EM01.

Go to step 9

Next

Go to step 6

Go to step 7

No

Yes

224

(d)

Measure resistance between
cylinder No.2 fuel injector wiring
harness connector EM15 terminal
No.A and ECM harness
connector terminal No.8. Inspect
whether the circuit is open. If
there is no open circuit, repair the
faulty part.

(e) Measure resistance between

cylinder No.2 fuel injector wiring
harness connector EM15 terminal
No.A and a reliable ground.
Inspect whether the circuit is
short to ground. Otherwise, repair
the faulty part.

ECM线束连接器

EM01

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

NL02-0033c

(f) Measure voltage between cylinder No.2 fuel injector harness connector EM15 terminal No.A

and a reliable ground. Inspect whether the circuit is short to power supply. Otherwise, repair
the faulty part.

Test Items

Standard Value

Resistance Between EM15 (A) and EM01 (63)

Less than 1 Ω

Resistance Between EM15 (A) and a Reliable Ground

10 kΩ or higher

Voltage Between EM15 (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.

Step 8

Replace ECM

Refer to 2.2.7.11 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.

Next

No

Repair the faulty part.

Yes

Next

ECMharnessconnectorEM01

225

(c) Clear DTC code.

(d) Start and run the engine at idle speed to warm up the engine for at least 5 min.

(e) Road test the vehicle for at least 10 min.

(f) Read control system DTC code again to confirm that the system has no DTC code.

Step 10

Troubleshooting

5. Maintenance

guide

:

Refer to 2.2.8.5 “Replacement of Fuel Injectors” to replace the fuel injectors.

No

Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

226