Nissan X-Trail 32. Manual — part 815

FUEL INJECTOR

EC-389

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4.

Also check harness for short to ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair or replace malfunctioning part.

10.

CHECK FUEL INJECTOR RELAY

Check fuel injector relay. Refer to

EC-389, "Component Inspection (Fuel Injector Relay)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-44, "Intermittent Incident"

.

NO

>> Replace fuel injector relay.

11.

CHECK FUEL INJECTOR

Check fuel injector. Refer to

EC-389, "Component Inspection (Fuel Injector)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-44, "Intermittent Incident"

.

NO

>> Replace fuel injector. Refer to

EM-48, "Exploded View"

.

Component Inspection (Fuel Injector)

INFOID:0000000010775280

1.

CHECK FUEL INJECTOR

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connector.

3.

Check the resistance between fuel injector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel injector relay. Refer to

EC-28, "ENGINE CONTROL SYSTEM : Component Parts

Location"

.

Component Inspection (Fuel Injector Relay)

INFOID:0000000010775281

1.

CHECK FUEL INJECTOR RELAY

1.

Turn ignition switch OFF.

2.

Remove fuel injector relay. Refer to

EC-28, "ENGINE CONTROL SYSTEM : Component Parts Location"

.

+

−

Continuity

Fuel injector

ECM

Cylinder

Connector

Terminal

Connector

Terminal

1

F37

2

F7

5

Existed

2

F38

2

6

3

F39

2

7

4

F40

2

8

Fuel injector

Resistance

(Approx.)

+

−

Terminal

1

2

1.44 – 1.73

Ω

[at 10 – 60

°

C (50 –140

°

F)]

EC-390

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

FUEL INJECTOR

3.

Check the continuity between fuel injector relay terminals as per
the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel injector relay. Refer to

EC-28, "ENGINE CONTROL SYSTEM : Component Parts

Location"

.

+

−

Condition

Continuity

Fuel injector relay

Terminal

3

5

12 V direct current supply between ter-
minals 1 and 2

Existed

No current supply

Not existed

6

7

12 V direct current supply between ter-
minals 1 and 2

Existed

No current supply

Not existed

JSBIA1178ZZ

LOW PRESSURE FUEL PUMP

EC-391

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

LOW PRESSURE FUEL PUMP

Component Function Check

INFOID:0000000010775282

1.

CHECK LOW PRESSURE FUEL PUMP FUNCTION

1.

Turn ignition switch ON.

2.

Pinch fuel feed hose

with two fingers.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to

EC-391, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010775283

1.

CHECK FUEL PUMP RELAY POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

4.

Also check harness for short to power.

Is the inspection result normal?

YES

>> Perform trouble diagnosis for power supply circuit.

NO

>> Repair or replace malfunctioning part.

3.

CHECK FUEL PUMP POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Reconnect ECM harness connector.

3.

Disconnect “fuel level sensor unit and fuel pump” harness connector.

4.

Turn ignition switch ON.

5.

Check the voltage between “fuel level sensor unit and fuel pump” harness connector and ground.

Fuel pressure pulsation should be felt on the fuel
feed hose for 1 second after ignition switch is
turned ON.

JSBIA0601ZZ

+

−

Voltage

ECM

Connector

Terminal

Connector

Terminal

F8

87

E16

128

Battery voltage

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

F8

87

F72

76

Existed

EC-392

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

LOW PRESSURE FUEL PUMP

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between “fuel level sensor unit and fuel pump” harness connector and IPDM E/R
harness connector.

4.

Also check harness for short to power.

Is the inspection result normal?

YES

>> Perform trouble diagnosis for power supply circuit.

NO

>> Repair or replace malfunctioning part.

5.

CHECK FUEL PUMP GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ground.

3.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace malfunctioning part.

6.

CHECK FUEL PUMP

Check fuel pump. Refer to

EC-392, "Component Inspection (Fuel Pump)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-44, "Intermittent Incident"

.

NO

>> Replace “fuel level sensor unit and fuel pump”. Refer to

FL-12, "Removal and Installation"

.

Component Inspection (Fuel Pump)

INFOID:0000000010775284

1.

CHECK FUEL PUMP

1.

Turn ignition switch OFF.

2.

Disconnect “fuel level sensor unit and fuel pump” harness connector.

3.

Check the resistance between “fuel level sensor unit and fuel pump” terminals as follows.

+

−

Voltage

Fuel level sensor unit and fuel

pump

Connector

Terminal

B40

1

Ground

Battery voltage should exist 1 second after igni-
tion switch is turn ON.

+

−

Continuity

Fuel level sensor unit and fuel

pump

IPDM E/R

Connector

Terminal

Connector

Terminal

B40

1

E11

24

Existed

+

−

Continuity

Fuel level sensor unit and fuel pump

Connector

Terminal

B40

3

Ground

Existed