Nissan Sentra. Instruction — part 439

EC-452

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

FUEL INJECTOR

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning fuel injector. Refer to

EM-40, "Removal and Installation"

Fuel injector

Condition

Resistance

+

−

Terminals

1

2

Temperature

°C (°F)

10 – 60 (50 – 140)

11.1 – 14.5

Ω

FUEL PUMP

EC-453

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

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FUEL PUMP

Component Function Check

INFOID:0000000009758711

1.

CHECK 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-453, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009758712

1.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-1

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Turn ignition switch ON.

4. Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-2

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between IPDM E/R 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 8.

NO

>> Repair or replace error-detected parts.

3.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-3

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect fuel pump harness connector.

4. Turn ignition switch ON.

5. Check the voltage between 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

ECM

Voltage

+

−

Connector

Terminal

Connector

Terminal

F24

18

E16

128

Battery voltage

+

−

Continuity

IPDM E/R

ECM

Connector

Terminal

Connector

Terminal

E46

45

F24

18

Existed

EC-454

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

FUEL PUMP

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 4.

4.

CHECK FUSE

1. Turn ignition switch OFF.

2. Disconnect 15A fuse (No. 50) from IPDM E/R.

3. Check 15A fuse.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace 15A fuse.

5.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-4

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between IPDM E/R harness connector and fuel pump harness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK FUEL PUMP GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check the continuity between fuel pump harness connector and ground.

3. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace error-detected parts.

7.

CHECK FUEL PUMP

Check fuel pump. Refer to

EC-455, "Component Inspection (Fuel Pump)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace fuel filter and fuel pump. Refer to

FL-6, "Exploded View"

.

8.

CHECK INTERMITTENT INCIDENT

+

−

Voltage

Fuel pump

Connector

Terminal

B48

1

Ground

Battery voltage should
for exist 1 second after
ignition switch is turn
ON.

+

−

Continuity

IPDM E/R

Fuel pump

Connector

Terminal

Connector

Terminal

E43

10

B48

1

Existed

+

−

Continuity

Fuel pump

Connector

Terminal

B48

3

Ground

Existed

FUEL PUMP

EC-455

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

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Check intermittent incident. Refer to

GI-39, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to

PCS-30, "Removal and Installation"

(With intelligent key) or

PCS-58,

"Removal and Installation"

(Without intelligent key).

NO

>> Repair or replace error-detected parts.

Component Inspection (Fuel Pump)

INFOID:0000000009758713

1.

CHECK FUEL PUMP

1. Turn ignition switch OFF.

2. Disconnect fuel level sensor unit and fuel pump harness connector.

3. Check resistance between fuel pump terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel filter and fuel pump. Refer to

FL-6, "Removal and Installation"

.

Fuel pump

Condition

Resistance

+

−

Terminals

1

3

Temperature

°C (°F)

25 (77)

0.2 - 5.0

Ω