Nissan Qashqai J11. Manual - part 454

ECK-376

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

P2688 FUEL HEATER

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Perform the trouble diagnosis for power supply circuit.

3.

CHECK FUEL HEATER RELAY CIRCUIT-1

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between fuel heater relay harness connector and ECM harness connector.

4.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK FUEL HEATER RELAY CIRCUIT-2

1.

Disconnect fuel heater and water level sensor harness connector.

2.

Check the continuity between fuel heater and water level sensor harness connector and fuel heater relay
harness connector.

3.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK FUEL HEATER RELAY

Check the fuel heater relay. Refer to 

ECK-377, "Component Inspection (Fuel Heater Relay)"

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Replace error-detected parts.

Component Inspection (Fuel Heater Relay)

INFOID:0000000010290053

1.

CHECK FUEL HEATER RELAY

1.

Turn ignition switch OFF.

2.

Remove fuel heater relay.

3.

Check continuity between fuel heater relay terminals as per the
following condition. 

+

−

Continuity

Fuel heater relay

ECM

Connector

Terminal

Connector

Terminal

F164

2

F80

95

Existed

+

−

Continuity

Fuel heater and water level 

sensor

Fuel heater relay

Connector

Terminal

Connector

Terminal

F191

5

F164

5

Existed

Fuel heater relay

Condition

Continuity

+

−

Terminal

3

5

12 V direct current supply 
between terminals 1 and 2

Existed

No current supply

Not existed

JSBIA0671ZZ

P2688 FUEL HEATER

ECK-377

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

C

D

E

F

G

H

I

J

K

L

M

A

ECK

N

P

O

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel heater relay.

ECK-378

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

LOW PRESSURE FUEL PUMP

LOW PRESSURE FUEL PUMP

Component Function Check

INFOID:0000000010519314

1.

CHECK FUEL PUMP FUNCTION

1.

Turn ignition switch ON.

2.

Pinch fuel feed hose with two fingers.
NOTE:
Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>>

ECK-379, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010519315

1.

CHECK FPCM POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect FPCM harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between FPCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform the trouble diagnosis for power supply circuit.

2.

CHECK FPCM GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the continuity between FPCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK FPCM INPUT AND OUTPUT CIRCUIT

1.

Disconnect ECM harness connector.

2.

Check the continuity between FPCM harness connector and ECM harness connector.

3.

Also check harness for short to ground and to power.

Is the inspection result normal?

+

−

Voltage

FPCM

Connector

Terminal

B76

8

Ground

Battery voltage

+

−

Continuity

FPCM

Connector

Terminal

B76

7

Ground

Existed

+

−

Continuity

FPCM

ECM

Connector

Terminal

Connector

Terminal

B77

9

E59

13

Existed

10

11

LOW PRESSURE FUEL PUMP

ECK-379

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

C

D

E

F

G

H

I

J

K

L

M

A

ECK

N

P

O

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK FUEL PUMP CONTROL CIRCUIT

1.

Disconnect fuel level sensor unit and fuel pump (main) harness connector.

2.

Check the continuity between FPCM harness connector and fuel level sensor unit and fuel pump (main)
harness connector.

3.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK LOW PRESSURE FUEL PUMP

Refer to 

ECK-380, "Component Inspection (Low Pressure Fuel Pump)"

.

Is the inspection result normal?

YES

>> Replace FPCM.

NO

>> Replace low pressure fuel pump.

Component Inspection (Low Pressure Fuel Pump)

INFOID:0000000010519316

1.

CHECK FUEL PRESSURE REGULATOR

1.

Turn ignition switch OFF.

2.

Check low fuel pressure.

Is inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK LOW PRESSURE FUEL PUMP

1.

Turn ignition switch OFF.

2.

Disconnect fuel level sensor unit and fuel pump (main).

3.

Check resistance between fuel level sensor unit and fuel pump (main) terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel level sensor unit and fuel pump (main).

+

−

Continuity

FPCM

Fuel level sensor unit and fuel 

pump (main)

Connector

Terminal

Connector

Terminal

B75

3

B94

1

Existed

4

4

5

3

6

2

+

−

Continuity

Fuel level sensor unit and 

fuel pump (main)

Terminals

2

3

Existed

4