Geely Emgrand X7. Manual part — 57

2.2.7.31 DTC P0267 P0268

1. DTC

description:

DTC P0267

Cylinder No.3 Fuel Injector Circuit Low Voltage Fault

DTC P0268

Cylinder No.3 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.3 fuel injector internal ground circuit through ECM
harness connector EM01 terminal No.7. 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

P0267

Hardware Circuit
Inspection

Injector Signal Circuit
Open or Short To Ground

P0268

Hardware Circuit
Inspection

Injector Signal Circuit
Short To Power Supply

1. Sensor

Circuit

2. Sensor

3. ECM.

3. Circuit

sketch

主继电器ER09

87

30

86

85

EM01

44

EM01

B

A

发

动
机

控

制

模
块

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

4. Diagnostic

Steps:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and

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

227

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 EM16.

(b) Measure resistance between the

two fuel injector terminals.

Standard Resistance

11.4-12 .6Ω @ 20 (68 )

℃

℉

(c) Connect the fuel injector harness

connector EM16.

喷油器3线束连接器 EM16

B

A

NL02-0047c

(a) Rotated ignition switch to OFF position .

(b) Disconnect cylinder No.3 fuel injector wiring harness connector EM16.

(c) Rotated ignition switch to ON position .

(d) Measure voltage between cylinder No.3 fuel injector wiring harness connector EM16 No.A

terminal and a reliable ground.

Standard Voltage: 11-14V

(e) Connect cylinder No.3 fuel injector wiring harness connector EM16.

Step 4

Inspect the fuel injector control circuit.

(a) Rotated ignition switch to OFF position .

(b) Disconnect cylinder No.3 fuel injector wiring harness connector EM16.

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 3harness connectorEM16

228

(c) Connect a light-emitting diodes test lamp to the fuel injector wiring harness connector EM16

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.3 fuel injector power circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the fuel injector

wiring harness connector EM16.

(c) Dismantle the engine main relay.

(d) Measure resistance between

cylinder No.3 fuel injector wiring
harness connector EM16 terminal
No.B and engine main relay
terminal No.30.

(e) Measure resistance between

cylinder No.3 fuel injector wiring
harness connector EM16 terminal
No.B and a reliable ground.

Standard Resistance

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

EF1

4

EF

01

EF

02

EF

04

EF

10

EF

1

1

EF1

8

EF2

4

NL02-0045c

Test Items

Standard Value

Resistance Between EM16 (B) and Main Relay Terminal No.3

Less than 1 Ω

Resistance Between EM16 (B) and A Reliable Ground

10 kΩ or higher

(f) Install the engine main relay.

(g) Connect cylinder No.3 fuel injector harness connector EM16.

Exclude the fuel injector power supply circuit fault.

Step 6

Inspect the Cylinder #3 fuel injector control circuit.

Go to step 9

Next

Go to step 6

Go to step 7

No

Yes

229

(a) Rotated ignition switch to OFF

position .

(b) Disconnect cylinder No.3 fuel

injector wiring harness connector
EM16.

(c)

Disconnect ECM harness
connector EM01.

(d)

Measure resistance between
cylinder No.3 fuel injector wiring
harness connector EM16 terminal
No.A and ECM harness
connector terminal No.7. Inspect
whether the circuit is open.
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

(e) Measure resistance between cylinder No.3 fuel injector wiring harness connector EM16

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 EM16 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 EM16 (A) and EM01 (7)

Less than 1 Ω

Resistance Between EM16 (A) and a Reliable Ground

10 kΩ or higher

Voltage Between EM16 (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.

Next

No

Repair the faulty part.

Yes

Next

ECMharness connectorEM01

230