Geely Emgrand X7. Manual part — 198

2.12.7.28 DTC P0230

1. DTC

description:

DTC P0230

Fuel Pump Relay Fault

The power pump relay coil working voltage is provided by ECM. ECM provides power through
ECM harness connector EN01 terminal No.71 to pump relay terminal No.1. The fuel pump is
grounded through the terminal No.2, fuel pump relay pull-in. ECM has an internal detection
circuit. By monitoring the feedback voltage ECM determines whether the control circuit is open,
short to ground or short to voltage.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The DTC
(Control Strategy)

Fault Locations

P0230

Hardware
Circuit
Inspection

Fuel Pump Relay Control Circuit Short to
Power Supply or Ground or Open

1. Relay

Circuit

2. Relay

3. ECM.

3. Circuit

sketch

NL02-2074b

3 SO26

9 EN01

44 EN01

68 EN01

4 SO26

M

ECM

IG2

BAT

10A

IF

3

3

15

A

E

F2

5

15

A

E

F2

1

FPR

MPR

IGN

1

3

2

5

86

87

30

85

燃油泵

燃油泵继电器

发动机主继电器

67 EN01

BAT

10

A

E

F1

6

BAT

4. Diagnostic

Steps:

Refer to 2.3.2 “Description and Operation” and 2.3.3 “ Operating Principle” to inspect the fuel
pump relay circuit.

Engine main
relay

Fuel pump
relay

Fuel
pump

791

2.12.7.29 DTC P0261 P0262

1. DTC

description:

DTC P0261

Cylinder No.1 Fuel Injector Circuit Low Voltage Fault

DTC P0262

Cylinder No.1 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.1. ECM controls Cylinder No.1 fuel injector internal ground circuit through ECM
harness connector EN01 terminal No.6. 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

P0261

Hardware
Circuit
Inspection

Injector Signal Circuit Open or
Short To Ground

P0262

Hardware
Circuit
Inspection

Injector Signal Circuit Short To
Power Supply

1. Sensor

Circuit

2. Sensor

3. ECM.

3. Circuit

sketch

NL02-2075b

44

EN01

ECM

BAT

15

A

E

F2

1

MPR

86

87

30

85

发动机主继电器

6

EN01

A

EN11

B

EN11

INJA

1缸燃油喷射器

Engine main
relay

1st cylinderfuel injector

792

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 EN11.

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

Standard Resistance

11.4-12.6Ωwith 20℃（68℉

(c) Connect the fuel injector harness connector EN11.

Step 3

Measure Fuel Injectors Working power supply

(a) Rotated ignition switch to OFF

position .

(b) Disconnect cylinder No.1 fuel

injector harness connector EN11.

(c) Rotated ignition switch to ON

position .

(d)

Measure voltage between
cylinder No.1 fuel injector
harness connector EN11 No.2
terminal and a reliable ground.

Standard Voltage: 11-14V

(e) Connect cylinder No.1 fuel

injector harness connector EN11.

NL02-2076b

A

B

EN11 1缸燃油喷射器线束连接器

A

No

Go to step 5

Yes

No

Refer to 2.2.8.2 “Replacement of Fuel Injectors” to
replace the fuel injectors

Yes

Next

EN11 1st cylinderfuel injector harness

connector

793

(a) Rotated ignition switch to OFF

position .

(b) Disconnect cylinder No.1 fuel

injector harness connector EN11.

(c) Connect test lamp made from

light-emitting diodes to the fuel
injector harness connector EN11
terminal No.1 and No.2.

(d) Start

the

engine.

NL02-2077b

A

B

EN11 1缸燃油喷射器线束连接器

A

B

(e) Observe whether test lamp is

flashing.

Is test lamp flashing as normal?

Step 5

Inspect and repair cylinder No.1 fuel injector power supply circuit.

NL02-2076b

A

B

EN11 1缸燃油喷射器线束连接器

A

4

Inspect the fuel injector control circuit.

Go to step 6

Go to step 7

No

Yes

EN11 1st cylinderfuel injector harness

connector

794