Geely Emgrand X7. Manual part - 59

Geely Emgrand X7. Manual part - 59

(a) Rotated ignition switch to OFF

position .

(b) Disconnect cylinder No.4 fuel

injector wiring harness connector
EM17.

(c)

Disconnect ECM harness
connector EM01.

(d) Measure resistance between

cylinder No.4 fuel injector wiring
harness connector EM17 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.

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

(e) Measure resistance between cylinder No.4 fuel injector wiring harness connector EM17

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 EM17 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 EM17 (A) and EM01 (26)

Less than 1 Ω

Resistance Between EM17 (A) and a Reliable Ground

10 kΩ or higher

Voltage Between EM17 (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.

Next

No

Repair the faulty part.

Yes

Next

ECMharness connectorEM01

235

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.

(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

236

2.2.7.33 DTC P0300

1. DTC

description:

DTC P0300

Multi-Cylinder Misfire

The engine control module (ECM) uses information from the crankshaft position (CKP) sensor
and the camshaft position (CMP) sensors to determine when an engine mis?re is occurring. By
monitoring variations in the crankshaft rotation speed for each cylinder ECM is able to detect
individual mis?re events. When a misfire happens, unburnt mixture will be discharged into the
exhaust system and burnt in the 3-way catalytic converter (TWC) which will overheat the
converter. A misfire rate that is high enough can cause 3-way catalytic converter damage. The
malfunction indicator lamp (MIL) will ash ON and OFF when the conditions for catalytic
converter overheated are present. A DTC will be set.

2. Setting DTC code and Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

P0300

Under stable
operating
conditions, ECM
detects the
crankshaft
rotation speed
fluctuations.

Under stable operating
conditions, When the ECM
detects the crankshaft rotation
speed fluctuations exceeding the
threshold set by the system:
When the fire degree is too low
for affecting the exhaust
emission, without emergency
control scheme, only record the
fault code and freeze the data
stream as well as turn on the
fault indication.

Lamp; when the fire degree is
too high, which may lead to
overheating of the catalyst,
compel to entering the fuel
open-loop control working
condition, and inhibit oxygen
correction learning. The fault
indicator lamp flickers with the
frequency of 1HZ.

1. Connector Loose or

Poor Connection

2. Vacuum Tube Hose

Broken or Loose

3. Ignition

System

4. Fuel

Injectors

5. Fuel

Pressure

6. Intake Air Pressure

Sensor

7. Engine

Coolant

Temperature Sensor

8. Cylinder

Compression

Pressure

9. Valve Clearance and

Timing

10. Evaporative Emission

Control System

11. Purged

Crankcase

Ventilation System

12. Intake System

13. Poor Exhaust System

Ventilation

14. ECM.

237

3. Circuit

sketch

Ignition System

蓄电池

EF40

EF21

主继电器ER09

87

30

86

85

4

EM01 COILA

EM01 MPR

1

EM01 COILB

81

44

EM01 COILD

62

EM01 COILC


一缸点火线圈

3

1

2

二缸点火线圈

3

1

2

三缸点火线圈

3

1

2

四缸点火线圈

3

1

2

NL02-0049c

Fuel Injector Nozzle

主继电器ER09

87

30

86

85

EM01

44

EM01

B

A



蓄电池

EF4

0

EF22

1缸喷油器

3缸喷油器

4缸喷油器

2缸喷油器

6

MPR

INJA

EM01

B

A

7

INJB

EM01

B

A

25

INJC

EM01

B

A

8

INJD

NL02-0043c

1. Diagnostic

Steps:

Notes:

If the control system stores DTC other than misfire, diagnose these DTC first and eliminate
the faults.

Main relay ER09

Battery

One cylinder ignition coil

Two cylindersignition

coil

Three cylindersignition coil

Four cylinderignition

coil

Engi

ne

contro

l

modu

le

Main relay ER09

Battery

1st cyinder

oil injecter

3rd cyinder

oil injecter

4th cyinder

oil injecter

2nd cyinder

oil injecter

Engi

ne

co

ntr

ol mo

dul

e

238

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