Nissan Maxima. Manual - part 856

MWI

POWER SUPPLY AND GROUND CIRCUIT

MWI-39

< DTC/CIRCUIT DIAGNOSIS >

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1.

 CHECK FUSES AND FUSIBLE LINK

Check that the following IPDM E/R fuses or fusible link are not blown.

Is the fuse blown?

YES

>> Replace the blown fuse or fusible link after repairing the affected circuit.

NO

>> GO TO 2

2.

 CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R connectors.

3. Check voltage between IPDM E/R harness connector and ground.

Is the measurement value normal?

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

 CHECK GROUND CIRCUIT

Check continuity between IPDM E/R harness connectors and

ground.

Does continuity exist?

YES

>> Inspection End.

NO

>> Repair harness or connector.

Terminal No.

Signal name

Fuses and fusible link No.

1

Battery power supply

B

2

A, D

36

A, E, L

Terminals

Voltage (V)

(Approx.)

(+)

(

−)

IPDM E/R

Connector

Terminal

Ground

E16

1

Battery voltage

2

E18

36

IPDM E/R

Ground

Continuity

Connector

Terminal

A: E18

12

Yes

B: E17

41

ALCIA0034ZZ

MWI-40

< DTC/CIRCUIT DIAGNOSIS >

FUEL LEVEL SENSOR SIGNAL CIRCUIT

FUEL LEVEL SENSOR SIGNAL CIRCUIT

Description

INFOID:0000000010049583

The fuel level sensor unit and fuel pump (fuel level sensor) detects the approximate fuel level in the fuel tank

and transmits the fuel level signal to the combination meter.

Component Function Check

INFOID:0000000010049584

1.

COMBINATION METER INPUT SIGNAL

1. Select “METER/M&A” on CONSULT.

2. Using “FUEL METER” of “DATA MONITOR”, compare the value of DATA MONITOR with fuel gauge

pointer of combination meter.

Does the data monitor value approximately match the fuel gauge indication?

YES

>> Inspection End.

NO

>> Replace combination meter. Refer to 

MWI-122, "Removal and Installation"

.

Diagnosis Procedure

INFOID:0000000010049585

Regarding Wiring Diagram information, refer to 

MWI-87, "Wiring Diagram"

.

1.

CHECK HARNESS CONNECTOR

1. Turn ignition switch OFF.

2. Check combination meter and fuel level sensor unit and fuel pump (fuel level sensor) terminals (meter-

side and harness-side) for poor connection.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair or replace terminals or connectors.

2.

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

1. Disconnect combination meter connector and fuel level sensor

unit and fuel pump (fuel level sensor) connector.

2. Check continuity between combination meter harness connector

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

harness connector (B).

3. Check continuity between combination meter harness connector

(A) and ground.

Fuel gauge pointer

Reference value of data monitor [lit.]

Full

Approx. 68

3/4

Approx. 56

1/2

Approx. 38

1/4

Approx. 22

Empty

Approx. 4

A

B

Continuity

Connector

Terminal

Connector

Terminal

M24

34

B42

2

Yes

AWNIA1768ZZ

MWI

FUEL LEVEL SENSOR SIGNAL CIRCUIT

MWI-41

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

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

1. Check continuity between combination meter harness connector

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

harness connector (B).

2. Check continuity between combination meter harness connector

(A) and ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair harness or connector.

4.

CHECK INSTALLATION CONDITION

Check fuel level sensor unit and fuel pump (fuel level sensor) installation, and check whether the float arm

interferes or binds with any of the internal components in the fuel tank.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Install the fuel level sensor unit and fuel pump (fuel level sensor) properly.

Component Inspection

INFOID:0000000010049586

1.

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

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

FL-6, "Removal and Installation"

. 

>> GO TO 2

2.

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

Check the resistance between terminals 2 and 5.

1* and 2*: When float arm is in contact with stopper.

Is inspection result normal?

YES

>> Inspection End.

NO

>> Replace fuel level sensor unit and fuel pump (fuel level

sensor). Refer to 

FL-6, "Removal and Installation"

.

A

Ground

Continuity

Connector

Terminal

M24

34

No

A

B

Continuity

Connector

Terminal

Connector

Terminal

M24

24

B42

5

Yes

A

Ground

Continuity

Connector

Terminal

M24

24

No

AWNIA1769ZZ

Terminal

Float position

mm (in)

Resistance value

(Approx.)

2

5

1*

Full (1)

154.5 (6.1)

4.5

Ω

2*

Empty (2)

23.4 (0.9)

81.5

Ω

WKIA5456E

MWI-42

< DTC/CIRCUIT DIAGNOSIS >

OIL PRESSURE SWITCH SIGNAL CIRCUIT

OIL PRESSURE SWITCH  SIGNAL CIRCUIT

Description

INFOID:0000000010049587

Detects the engine oil pressure and transmits the oil pressure switch signal to the IPDM E/R.

Component Function Check

INFOID:0000000010049588

1.

COMBINATION METER INPUT SIGNAL

1. Select “METER/M&A” on CONSULT.

2. Monitor “OIL W/L” of “DATA MONITOR” while operating ignition switch.

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010049589

Regarding Wiring Diagram information, refer to 

MWI-87, "Wiring Diagram"

.

1.

CHECK OIL PRESSURE SWITCH CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R connector F10 and oil pressure switch connector F41.

3. Check continuity between IPDM E/R harness connector F10 terminal 75 and oil pressure switch harness

connector F41 terminal 1.

4. Check continuity between IPDM E/R harness connector F10 terminal 75 and ground.

Are the inspection results normal?

YES

>> Inspection End.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000010049590

1.

CHECK OIL PRESSURE SWITCH

Check continuity between oil pressure switch and ground.

Is the inspection result normal?

OIL W/L
When ignition switch is in ON 
position (Engine stopped)

: ON

When engine is running

: OFF

Continuity should exist.

Continuity should not ex-
ist.

Condition

Oil pressure [kPa (kg/cm

2

, psi)]

Continuity

Engine stopped

Less than 29 (0.3, 4)

Yes

Engine running

More than 29 (0.3, 4) 

No

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