Geely Emgrand X7. Manual part — 202

NL02-2088b

A

B

EN13 3缸燃油喷射器线束连接器

A

Standard Resistance

Test Items

Standard Value

EN13(b) and main relay No,30 terminal

Less than 1 Ω

EN13(b) and reliable grounding

10 kΩ or higher

(f) Install the engine main relay.

(g) Connect cylinder 3 fuel injector wire harness connector EN13.

Exclude the fuel injector power supply circuit fault.

Step 6

Inspect the Cylinder #3 fuel injector control circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect cylinder No.3 fuel

injector harness connector EN13.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between

cylinder No.3 fuel injector wiring
harness connector EN13 terminal
No.A and ECM harness
connector terminal No.7. Inspect
whether the circuit is open.
Otherwise, repair the faulty part.

NL02-2091b

A

B

EN13 3缸燃油喷射器线束连接器

B

Go to step 9

Next

EN13 3rd cylinderfuel injector

EN13 3rd cylinderfuel injector

807

(e) Measure resistance between

cylinder No.3 fuel injector wiring
harness connector EM13 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.3 fuel injector
harness connector EN13 terminal
No.A and a reliable ground.
Inspect whether the circuit is
short to power supply. Otherwise,
repair the faulty part.

NL02-2092b

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

7

Test Items

Standard Value

EN13(A)-EN01(7)Resistance value

Less than 1 Ω

EN13(A)-reliable grounding resistance value

10 kΩ or higher

EN13(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.

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

Next

No

Repair the faulty part.

Yes

Next

EN01 engine control module harness

connector

808

(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 2.12.8.5 “Replacement of Fuel Injectors” to replace the fuel injectors.

No

Refer to 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

809

2.12.7.32 DTC P0270 P0271

1. DTC

description:

DTC P0270

Cylinder No.4 fuel injector circuit low voltage fault

DTC P0271

Cylinder No.4 fuel injector circuit high voltage fault

Fuel injectors operating voltage is provided by The Main Relay controlled by ECM. Battery
voltage passes through the main relay terminal No.3 to all fuel injector wiring harness connectors
terminal No.A. ECM controls Cylinder No.4 fuel injector internal ground circuit through ECM
harness connector EN01 terminal No.26. ECM monitors all fuel injector driver circuits status, if
ECM detects driving circuit status corresponding voltage is incorrect, ECM will set a fuel injector
control circuit fault DTC code.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC
Detection
Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

P0270

Hardware
Circuit
Inspection

Injector Signal Circuit Open
or Short To Ground

P0271

Hardware
Circuit
Inspection

Injector Signal Circuit Short
To Power Supply

1. Sensor

Circuit

2. Sensor

3. ECM.

3. Circuit

sketch

NL02-2093b

44

EN01

ECM

BAT

15

A

E

F2

1

MPR

86

87

30

85

发动机主继电器

25

EN01

A

EN14

B

EN14

INJC

4缸燃油喷射器

Engine
main relay

4th cylinderfuel

injector

810