Nissan Quest E52. Manual - part 918

MWI

FUEL LEVEL SENSOR SIGNAL CIRCUIT

MWI-77

< DTC/CIRCUIT DIAGNOSIS >

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FUEL LEVEL SENSOR SIGNAL CIRCUIT

Description

INFOID:0000000009864291

The fuel level sensor unit and fuel pump (fuel level sensor) detect the fuel level in the fuel tank and transmit
the fuel gauge signal to the combination meter.

Component Function Check

INFOID:0000000009864292

1.

PERFORM COMPONENT FUNCTION CHECK (1)

1.

Turn ignition switch OFF.

2.

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

3.

Connect variable resistor between harness connector terminals located on the vehicle side of the fuel
level sensor unit and fuel pump (fuel level sensor). 

4.

Set variable resistor according to the resistance value shown in the following table and turn ignition switch
ON.

*: Reference resistance values used when the combination meter judges the indication position of the fuel
gauge.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refer to 

MWI-77, "Diagnosis Procedure"

.

2.

PERFORM COMPONENT FUNCTION CHECK (2)

Check the fuel level sensor unit and fuel pump (fuel level sensor). Refer to 

MWI-78, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the fuel level sensor unit and fuel pump (fuel level sensor). Refer to 

FL-5, "Removal and

Installation"

.

Diagnosis Procedure

INFOID:0000000009651514

1.

CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR) CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect combination meter connector and fuel level sensor unit and fuel pump (fuel level sensor) con-
nector.

3.

Check continuity between combination meter harness connector and fuel level sensor unit and fuel pump
(fuel level sensor) harness connector.

Fuel level sensor unit and fuel pump (fuel level sensor)

Connector

Terminals

B40

2

5

Resistance (

Ω

)

*

(Approx.)

Fuel gauge indication position

(Approx.)

Less than 94

Full

140

3/4

186

1/2

232

1/4

More than 278

Empty

Combination meter

Fuel level sensor unit and fuel 

pump (fuel level sensor)

Continuity

Connector

Terminal

Connector

Terminal

M34

34

B40

2

Existed

MWI-78

< DTC/CIRCUIT DIAGNOSIS >

FUEL LEVEL SENSOR SIGNAL CIRCUIT

4.

Check continuity between combination meter harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR) GROUND CIRCUIT

1.

Check continuity between fuel level sensor unit and fuel pump (fuel level sensor) harness connector and
combination meter harness connector.

2.

Check continuity between fuel level sensor unit and fuel pump (fuel level sensor) harness connector and
ground.

Is the inspection result normal?

YES

>> Replace combination meter. Refer to 

MWI-93, "Removal and Installation"

.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000009651515

1.

CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR)

1.

Remove the fuel level sensor unit and fuel pump (fuel level sensor). Refer to 

FL-5, "Removal and Installa-

tion"

.

2.

Check the resistance between fuel level sensor unit and fuel
pump (fuel level sensor).

*: When float rod is contact with stopper.

Is inspection result OK?

YES

>> INSPECTION END

NO

>> Replace fuel level sensor unit and fuel pump (fuel level sensor). Refer to 

FL-5, "Removal and

Installation"

.

Combination meter

Ground

Continuity

Connector

Terminal

M34

34

Not existed

Fuel level sensor unit and fuel 

pump (fuel level sensor)

Combination meter

Continuity

Connector

Terminal

Connector

Terminal

B40

5

M34

24

Existed

Fuel level sensor unit and fuel 

pump (fuel level sensor)

Ground

Continuity

Connector

Terminal

B40

5

Not existed

Terminals

Condition

Resistance (

Ω

)

(Approx.)

Height [mm (in)]

Fuel level sensor unit 

and fuel pump (fuel 

level sensor)

2

5

Full

*

 (A)

51

133.0 (5.24)

Empty

*

 (B)

283

15.7 (0.618)

JSNIA3344ZZ

MWI

OIL PRESSURE SWITCH SIGNAL CIRCUIT

MWI-79

< DTC/CIRCUIT DIAGNOSIS >

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OIL PRESSURE SWITCH SIGNAL CIRCUIT

Component Function Check

INFOID:0000000009651516

1.

CHECK COMBINATION METER INPUT SIGNAL

Select the “Data Monitor” for the “METER/M&A” and check the “OIL W/L” monitor value.

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009651517

1.

CHECK OIL PRESSURE SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector and oil pressure switch connector.

3.

Check continuity between IPDM E/R harness connector and oil pressure switch harness connector.

4.

Check continuity between IPDM E/R harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000009651518

1.

CHECK OIL PRESSURE SWITCH

Check continuity between oil pressure switch and ground.

Is the inspection result normal?

YES

>> INSPECTION END

“OIL W/L”

Ignition switch ON

: On

Engine running

: Off

Terminals

Continuity

(+)

(

−

)

IPDM E/R

Oil pressure switch

Connector

Terminal

Connector

Terminal

F12

75

F63

1

Existed

Terminals

Continuity

(+)

(

−

)

IPDM E/R

Ground

Connector

Terminal

F12

75

Not existed

Condition

Continuity

Engine stopped

Existed

Engine running

Not existed

ELF0044D

MWI-80

< DTC/CIRCUIT DIAGNOSIS >

OIL PRESSURE SWITCH SIGNAL CIRCUIT

NO

>> Replace oil pressure switch. Refer to 

EM-38, "Exploded View"

.