Infiniti Q45. Manual - part 288

COMBINATION METERS

DI-19

C

D

E

F

G

H

I

J

L

M

A

B

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3. 

CHECK ECM SYSTEM

Perform ECM self-diagnosis. Refer to 

EC-115, "CONSULT-II Function (ENGINE)"

 .

OK or NG

OK

>> Replace combination meter.

NG

>> Perform “Diagnostic Procedure” for displayed DTC.

Engine Coolant Temperature Signal Inspection

NKS001BC

1. 

CHECK ECM SYSTEM

Perform ECM self-diagnosis. Refer to 

EC-115, "CONSULT-II Function (ENGINE)"

 .

OK or NG

OK

>> Replace combination meter.

NG

>> Perform “Diagnostic Procedure” for displayed DTC.

DI-20

COMBINATION METERS

Fuel Level Sensor Signal Inspection

NKS001BD

NOTE:
The following symptoms do not indicate a malfunction.
Fuel level sensor unit

●

Depending on vehicle posture or driving circumstance, the fuel level in the tank various, and the pointer
may fluctuate.

●

If the vehicle is fueled with the ignition switch ON, the pointer will move slowly.

Low-fuel warning lamp

●

Depending on vehicle posture or driving circumstance, the fuel level in the tank varies, and the warning
lamp ON timing may be changed.

1. 

CHECK HARNESS CONNECTOR

Check combination meter, fuel level sensor unit and terminals (meter side, module side, lead side, and har-
ness side) for poor connection and bend.

OK or NG

OK

>> GO TO 2.

NG

>> Repair terminal or connector.

2. 

CHECK HARNESS CONNECTOR OUTPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect fuel level sensor unit connector.

3.

Turn ignition switch ON.

4.

Check voltage between combination meter harness connector
M42 terminal 30 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Replace combination meter.

3. 

CHECK FUEL LEVEL SENSOR OPEN CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect combination meter connector.

3.

Check continuity between combination meter harness connector
M42 terminals 29, 30 and fuel level sensor unit harness connec-
tor B239 terminals 6, 5.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

30 – Ground

: Approx. 5 V

SKIB0665E

29 – 6

: Continuity should exist.

30 – 5

SKIB0666E

COMBINATION METERS

DI-21

C

D

E

F

G

H

I

J

L

M

A

B

DI

4. 

CHECK FUEL LEVEL SENSOR SHORT CIRCUIT

Check continuity between combination meter harness connector
M42 terminals 29, 30 and ground.

OK or NG

OK

>> GO TO 5.

NG

>> Repair harness or connector.

5. 

CHECK FUEL LEVEL SENSOR UNIT

Check the components. Refer to 

DI-22, "CHECK FUEL LEVEL SENSOR UNIT"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace fuel level sensor unit.

6. 

CHECK INSTALLATION CONDITION

Check fuel level sensor unit installation, and check whether the float arm interferes or binds with any compo-
nents inside the arm.

OK or NG

OK

>> Replace combination meter.

NG

>> Install fuel level sensor unit properly.

Fuel Gauge Pointer Fluctuates, Indicator Wrong Value, or Varies

NKS001BE

1. 

CHECK THE FUEL GAUGE POINTER FOR FLUCTUATION

Does the indication value fluctuate during driving or just before/after stop?

YES

>> The pointer fluctuation may be caused by fuel level change in the fuel tank.

NO

>> Ask the customer about the situation when the symptom occurs in detail, and perform the trouble

diagnosis.

Fuel Gauge Does Not Move to FULL Position

NKS001BF

1. 

QUESTION 1

Does it take a long time for the pointer to move to FULL position?

YES

>> GO TO 2.

NO

>> GO TO 3.

2. 

QUESTION 2

Was the vehicle fueled with the ignition switch ON?

YES

>> Be sure to fuel the vehicle with the ignition switch OFF. Otherwise it will take a long time to move

to FULL position because of the characteristic of the fuel gauge.

NO

>> GO TO 3.

29 – Ground

: Continuity should not exist.

30 – Ground

SKIB0679E

DI-22

COMBINATION METERS

3. 

QUESTION 3

Is the floor or the vehicle inclined?

YES

>> It may not be filled fully.

NO

>> GO TO 4.

4. 

QUESTION 4

During driving, does the fuel gauge pointer move gradually toward EMPTY position?

YES

>> Check the components. Refer to 

DI-22, "CHECK FUEL LEVEL SENSOR UNIT"

 .

NO

>> The float arm may interfere or bind with any of the components in the fuel tank.

ICC System Display Does Not Illuminate

NKS001BG

1. 

CHECK OPERATION OF ICC SYSTEM DISPLAY

Activate self-diagnosis mode of combination meter. Refer to 

DI-16, "OPERATION PROCEDURE"

 .

Does all of ICC system display illumination?

YES

>> GO TO 2.

NO

>> Replace combination meter.

2. 

CHECK ICC SYSTEM

Perform ICC system trouble diagnosis. Refer to 

ACS-32, "TROUBLE DIAGNOSIS - GENERAL DESCRIP-

TION"

 .

OK or NG

OK

>> Replace combination meter.

NG

>> Repair as need.

Electrical Components Inspection

NKS001BH

CHECK FUEL LEVEL SENSOR UNIT

●

For removal, refer to 

FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

.

●

Check resistance between terminals 5 and 6.

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

Terminal

Float position [mm (in)]

Resistance value [

Ω

]

5

6

Full (3)

*1

Approx. 78 (3.1)

Approx. 6

1/2 (2)

Approx. 200 (7.87)

Approx. 33

Empty (1)

*2

Approx. 341 (13.43)

Approx. 90

SKIA3428E