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 Checks

The ignition switch is turned on, turning on

time longer than the system preset

threshold. the fuel pump relay voltage is

too high or too low.

1. Relay Circuit

2. Relay

3. ECM

3. Schematic

05

12

EO35

EO35

EO35

EO35

EO35

2

4

3

1

M

71

FPR

62

MPR

VBATPROT

VBATPROT

22

6

VBAT

1

EF04

Main Relay

From Battery

Fuel Pump Unit

To 

Instrument 

Cluster

Engine 

Control 

Module

Fuel Pump Relay

FE02-5250b

4. Diagnostic Steps:

For fuel pump relay diagnostic. Refer to 

2.13.1.1

 

Fuel Pump Inoperative

.

2.12.7.29 DTC P0261 P0262

1. DTC Descriptor:

DTC

P0261

Cylinder No.1 Fuel Injector Circuit Low Voltage Fault

DTC

P0262

Cylinder No.1 Fuel Injector Circuit High Voltage Fault

Engine

Control System JL4G15-D

2-695

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 EO01 terminal No.65. 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 Checks

Injector Signal Circuit Open or Short

To Ground

1. Sensor Circuit

2. Sensor

3. ECM

P0262

Hardware Circuit Checks

Injector Signal Circuit Short To Power

Supply

1. Sensor Circuit

2. Sensor

3. ECM

3. Schematic:

FE02-5251b

MAIN

EF12

5

2

3

1

1

2

MPR

EO01

65

INJA

EO35

62

Main Relay

From Battery

Engine 

Control 

Module

Cylinder No.1 Fuel Injector

2-696

Control System JL4G15-D

Engine

4. Diagnostic Steps:

Note

Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.

Step 1

Initial Inspection

(a)

Check for fuel injector wiring harness connector damage,
poor connection, aging and signs of loosening.

Next

Step 2

Measure the fuel injector resistance.

2

1

Cylinder No.1 Fuel Injector

FE02-5052b

(a)

Disconnect the fuel injector wiring harness connector EO11.

(b)

Measure resistance between the two fuel injector terminals.

Standard Resistance: 11.6-12.4 Ω at 20°C(68 ºF)

(c)

Connect the fuel injector wiring harness connector EO11.

No

Replace fuel injector. Refer to 

2.2.8.2

 

Fuel

Injector Replacement

.

Yes

Step 3

Measure fuel injector working power supply.

FE02-5252b

2

1

Cylinder No.1 Fuel Injector Harness 
Connector EO11

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect cylinder No.1 fuel injector wiring harness
connector EO11.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure voltage between cylinder No.1 fuel injector wiring
harness connector EO11 terminal No.2 and a reliable ground.

Standard Voltage: 11-14 V

(e)

Connect cylinder No.1 fuel injector wiring harness connector
EO11.

Voltage normal?

No

Go to step 5

Yes

Step 4

Check the fuel injector control circuit.

Engine

Control System JL4G15-D

2-697

FE02-5253b

2

1

Cylinder No.1 Fuel Injector Harness 
Connector EO11

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect cylinder No.1 fuel injector wiring harness
connector EO11.

(c)

Connect a light-emitting diodes test lamp to the fuel injector
wiring harness connector EO11 terminal No.1 and 2.

(d)

Start the engine.

(e)

Observe whether test lamp is flashing.

Is the test lamp flashing?

No

Go to step 6

Yes

Go to step 7

Step 5

Check and repair cylinder No.1 fuel injector power circuit.

1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF14

EF24

EF28

EF27

EF26

EF18

EF07

EF06

EF30

EF19

EF20

EF21

EF22

EF23

EF25

EF15

EF16

EF17

EF13

EF12

EF1

1

EF10

EF09

EF08

EF05

EF04

EF03

EF02

EF01

G

1

2

5 3

2

1

Cylinder No.1 Fuel Injector Harness 
Connector EO11

FE02-5254b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect the fuel injector wiring harness connector EO11.

(c)

Remove the engine main relay.

(d)

Measure resistance between cylinder No.1 fuel injector
wiring harness connector EO11 terminal No.2 and engine
main relay terminal No.3.

(e)

Measure resistance between cylinder No.1 fuel injector
wiring harness connector EO11 terminal No.2 and a reliable
ground.

Test Items

Standard Value

Resistance Between EO11 (2) and Main Relay
Terminal No.3

Less than 1 Ω

Resistance Between EO11 (2) and a reliable
ground

10 kΩ or higher

(f)

Install the engine main relay.

(g)

Connect cylinder No.1 fuel injector wiring harness connector
EO11.

Exclude fuel injector power circuit malfunction.

Next

Go to step 9

Step 6

Check cylinder No.1 fuel injector control circuit.

2-698

Control System JL4G15-D

Engine