Nissan Qashqai (2007-2010). Manual - part 350

ELECTRICAL LOAD SIGNAL

EC-919

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> INSPECTION END

3.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-11, "System Diagram"

 (XENON TYPE) or 

EXL-191, "System Diagram"

 (HALOGEN TYPE).

>> INSPECTION END

4.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

EC-920

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

FUEL INJECTOR

FUEL INJECTOR

Description

INFOID:0000000001089523

The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.

Component Function Check

INFOID:0000000001089524

1.

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?

YES

>> GO TO 2.

NO

>> Go to 

EC-923, "Diagnosis Procedure"

.

2.

CHECK FUEL INJECTOR FUNCTION

With CONSULT-III

1.

Start engine.

2.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.

3.

Make sure that each circuit produces a momentary engine speed drop.

Without CONSULT-III

1.

Let engine idle.

2.

Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-923, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001089525

1.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between fuel injector harness connector and ground.

PBIA9664J

Clicking noise should be heard.

PBIB3332E

FUEL INJECTOR

EC-921

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F123, E6
• 10A fuse (No. 58)
• Harness for open or short between fuel injector and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

3.

CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between fuel injector harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK FUEL INJECTOR

Refer to 

EC-924, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning fuel injector.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

Component Inspection

INFOID:0000000001089526

1.

CHECK FUEL INJECTOR

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connector.

3.

Check resistance between fuel injector terminals as follows.

Fuel injector

Ground

Voltage

Cylinder

Connector

Terminal

1

F37

1

Ground

Battery voltage

2

F38

1

3

F39

1

4

F40

1

Fuel injector

ECM

Continuity

Cylinder

Connector

Terminal

Connector

Terminal

1

F37

2

F7

31

Existed

2

F38

2

30

3

F39

2

29

4

F40

2

25

EC-922

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

FUEL INJECTOR

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning fuel injector.

Terminals

Resistance [at 10 - 60

°

C (50 - 140

°

F)]

1 and 2

11.1 - 14.5

Ω