FE02-5263b

2

1

Cylinder No.3 Fuel Injector Harness 
Connector EO13

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect cylinder No.3 fuel injector wiring harness
connector EO13.

(c)

Connect a light-emitting diodes test lamp to the fuel injector
wiring harness connector EO13 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.3 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.3 Fuel Injector Harness 
Connector EO13

FE02-5264b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect the fuel injector wiring harness connector EO13.

(c)

Remove the engine main relay.

(d)

Measure resistance between cylinder No.3 fuel injector
wiring harness connector EO13 terminal No.2 and engine
main relay terminal No.3.

(e)

Measure resistance between cylinder No.3 fuel injector
wiring harness connector EO13 terminal No.2 and a reliable
ground.

Test Items

Standard Value

Resistance Between EO13 (2) and Main
Relay Terminal No.3

Less than 1 Ω

Resistance Between EO13 (2) and A
Reliable Ground

10 kΩ or higher

(f)

Install the engine main relay.

(g)

Connect cylinder No.3 fuel injector wiring harness connector
EO13.

Exclude fuel injector power circuit malfunction.

Next

Go to step 9

Step 6

Check cylinder No.3 fuel injector control circuit.

Engine

Control System JL4G15-D

2-707

2

1

1

17

33

53

54

55

56

57

58

59

60

61

62

63

64

66

67

68

69

70

71

72

73

34

35

36

37

38

39

40

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51

52

18

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2

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16

65

Cylinder No.3 Fuel Injector Harness 
Connector EO13

ECM Harness Connector EO01

FE02-5265b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect cylinder No.3 fuel injector wiring harness
connector EO13.

(c)

Disconnect ECM harness connector EO01.

(d)

Measure resistance between cylinder No.3 fuel injector
wiring harness connector EO13 terminal No.1 and ECM
harness connector terminal No.64. Check whether the circuit
is open. Otherwise, repair the faulty part.

(e)

Measure resistance between cylinder No.3 fuel injector
wiring harness connector EO13 terminal No.1 and a reliable
ground. Check whether the circuit is short to ground.
Otherwise, repair the faulty part.

(f)

Measure voltage between cylinder No.3 fuel injector wiring
harness connector EO13 terminal No.1 and a reliable ground.
Check whether the circuit is short to power supply. Otherwise,
repair the faulty part.

Test Items

Standard Value

Resistance Between EO13 (1) and EO01 (64)

Less than 1 Ω

Resistance Between EO13 (1) and A Reliable
Ground

10 kΩ or higher

Voltage Between EO13 (1) and A Reliable
Ground

0 V

Execute next step as per normal.

Next

Step 7

Check ECM power supply circuit.

(a)

Check whether ECM power supply circuit is normal.

(b)

Check whether ECM ground circuit is normal.

No

Repair the faulty part.

Yes

Step 8

Replace ECM.

(a)

Carry out crankshaft self learn after ECM replacement. Refer
to 

2.12.7.11

 

Crankshaft Position Sensor (CKP) Learn

.

Next

Step 9

Use scan tool to confirm whether the DTC code is stored again.

(a)

Connect scan tool to the datalink connector.

(b)

Turn the 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.

2-708

Control System JL4G15-D

Engine

(f)

Read control system DTC code again to confirm that the
system has no DTC code.

No

Intermittent Fault. Refer to 

2.2.7.3

 

Intermittent

Fault Check

.

Yes

Step 10

Diagnostic completed.

5. Repair Instructions:

Replace the fuel injector. Refer to 

2.2.8.2

 

Fuel Injector Replacement

.

2.12.7.32 DTC P0270 P0271

1. DTC Descriptor:

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.1. ECM controls Cylinder No.4 fuel injector internal ground
circuit through ECM harness connector EO01 terminal No.66. 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 Checks

Injector Signal Circuit Open or Short

To Ground

1. Sensor Circuit

2. Sensor

3. ECM

P0271

Hardware Circuit Checks

Injector Signal Circuit Short To Power

Supply

1. Sensor Circuit

2. Sensor

3. ECM

Engine

Control System JL4G15-D

2-709

3. Schematic:

MAIN

EF12

5

2

3

1

1

2

MPR

EO01 INJC

EO35

62

66

Main Relay

From Battery

Engine 

Control 

Module

Cylinder No.4 Fuel Injector

FE02-5266b

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.

2-710

Control System JL4G15-D

Engine