Nissan X-Trail 32. Manual - part 816

LOW PRESSURE FUEL PUMP

EC-393

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> INSPECTION END

NO

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

FL-12, "Removal and Installation"

.

Fuel level sensor unit and fuel pump

Resistance

+

−

Terminal

1

3

0.2 - 5.0 

Ω

 [at 25

°

C (77

°

F)]

EC-394

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

HIGH PRESSURE FUEL PUMP

HIGH PRESSURE FUEL PUMP

Component Function Check

INFOID:0000000010775285

1.

CHECK HIGH PRESSURE FUEL PUMP FUNCTION

With CONSULT

1.

Start engine.

2.

Select “FUEL PRES SEN V” in “DATA MONITOR” mode of “ENGINE” using CONSULT and check the
indication as per the following conditions.

Without CONSULT

1.

Start engine.

2.

Check the voltage between ECM terminals as per the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-394, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010775286

1.

CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector and ground.

Monitor item

Condition

Indication

FUEL PRES SEN V

At idle

820 - 1,140 mV

Revving engine up to 4,000 rpm 
quickly.

820 - 2,900 mV

ECM

Condition

Voltage

Voltage

+

−

Terminal

F8

51

54

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending on 
rpm at idle.

Battery voltage

(11 - 14 V)  

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

Battery voltage

(11 - 14 V)  

JPBIA4722ZZ

JPBIA4723ZZ

+

−

Voltage

ECM

Connector

Terminal

F8

50

Ground

Battery voltage

HIGH PRESSURE FUEL PUMP

EC-395

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 2.

2.

CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect high pressure fuel pump relay harness connector.

4.

Check the continuity between ECM harness connector and high pressure fuel pump relay harness con-
nector.

5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (CONTACT SIDE)

Check the voltage between high pressure fuel pump relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Perform the trouble diagnosis for power supply circuit.

4.

CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (EXCITATION COIL SIDE)

1.

Install all removed parts.

2.

Turn ignition switch ON.

3.

Check the voltage between high pressure fuel pump relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE)

1.

Turn ignition switch OFF.

2.

Disconnect high pressure fuel pump relay harness connector.

3.

Disconnect IPDM E/R harness connector.

4.

Check the continuity between IPDM E/R harness connector and high pressure fuel pump relay harness
connector.

+

−

Continuity

ECM

High pressure fuel pump re-

lay

Connector

Terminal

Connector

Terminal

F8

50

F58

5

Existed

+

−

Voltage

High pressure fuel pump relay

Connector

Terminal

F58

3

Ground

Battery voltage

+

−

Voltage

High pressure fuel pump relay

Connector

Terminal

F58

1

Ground

Battery voltage

EC-396

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

HIGH PRESSURE FUEL PUMP

5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace malfunctioning part.

6.

CHECK HIGH PRESSURE FUEL PUMP RELAY GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect high pressure fuel pump relay harness connector.

3.

Check the continuity between high pressure fuel pump relay harness connector and ground.

4.

Also check harness for short to ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace malfunctioning part.

7.

CHECK HIGH PRESSURE FUEL PUMP RELAY

Check high pressure fuel pump relay. Refer to 

EC-398, "Component Inspection (High Pressure Fuel Pump

Relay)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace high pressure fuel pump relay. Refer to 

EC-119, "Wiring Diagram"

 for connector number,

PG-91, "LHD : Engine Room Harness"

 for relay location.

8.

CHECK HIGH PRESSURE FUEL PUMP CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector and high pressure fuel pump relay harness connector.

3.

Check the continuity between ECM harness connector and high pressure fuel pump harness connector.

4.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace malfunctioning part.

9.

CHECK HIGH PRESSURE FUEL PUMP

Check high pressure fuel pump. Refer to 

EC-397, "Component Inspection (High Pressure Fuel Pump)"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace high pressure fuel pump. Refer to 

FL-11, "Exploded View"

.

+

−

Continuity

IPDM E/R

High pressure fuel pump re-

lay

Connector

Terminal

Connector

Terminal

F72

66

F58

1

Existed

+

−

Continuity

High pressure fuel pump relay

Connector

Terminal

F58

2

Ground

Existed

+

−

Continuity

ECM

High pressure fuel pump

Connector

Terminal

Connector

Terminal

F8

51

F115

1

Existed

52

2