Infiniti M45 (Y34). Manual - part 426

 

  Index      Infiniti     Infiniti M45 (Y34) - service repair manual 2004 year

 

Search            copyright infringement  

 

 

 

 

 

 

 



 

 

Content   ..  424  425  426  427   ..

 

 

Infiniti M45 (Y34). Manual - part 426

 

 

DTC P0461 FUEL LEVEL SENSOR

EC-393

C

D

E

F

G

H

I

J

K

L

M

A

EC

 WITH GST

NOTE:
Start from step 8, if it is possible to confirm that the fuel cannot be drained by 30   (7-7/8 US gal, 6-5/8
Imp gal) in advance.
1.

Prepare a fuel container and a spare hose.

2.

Release fuel pressure from fuel line, refer to 

EC-46, "FUEL PRESSURE RELEASE"

 .

3.

Remove the fuel feed hose on the fuel level sensor unit.

4.

Connect a spare fuel hose where the fuel feed hose was removed.

5.

Turn ignition switch OFF.

6.

Set voltmeters probe between ECM terminal 119 (fuel level sen-
sor signal) and ground.

7.

Turn ignition switch ON.

8.

Check voltage between ECM terminal 119 and ground and note
it.

9.

Drain fuel by 30   (7-7/8 US gal, 6-5/8 Imp gal) from the fuel
tank using proper equipment.

10. Fill fuel into the fuel tank for 30   (7-7/8 US gal, 6-5/8 Imp gal).

11. Confirm that the voltage between ECM terminal 119 and ground

changes more than 0.03V during step 8 - 10.
If NG, check component of fuel level sensor, refer to 

DI-19,

"CHECK FUEL LEVEL SENSOR UNIT"

 .

PBIB1149E

EC-394

DTC P0462, P0463 FUEL LEVEL SENSOR

DTC P0462, P0463 FUEL LEVEL SENSOR

PFP:25060

Component Description

ABS002LJ

The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal to
the ECM.
It consists of two parts, one is mechanical float and the other is vari-
able resistor. Fuel level sensor output voltage changes depending on
the movement of the fuel mechanical float.

On Board Diagnosis Logic

ABS002LK

ECM receives two signals from the fuel level sensor circuit.
One is fuel level sensor power supply circuit, and the other is fuel level sensor ground circuit.
This diagnosis indicates the former, to detect open or short circuit malfunction.

DTC Confirmation Procedure

ABS002LL

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at ignition
switch ON.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Wait at least 5 seconds.

4.

If 1st trip DTC is detected, go to 

EC-396, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure WITH CONSULT-II above.

PBIB1241E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0462
0462

Fuel level sensor circuit 
low input

An excessively low voltage from the sensor is 
sent to ECM.

Harness or connectors
(The sensor circuit is open or shorted)

Fuel level sensor

P0463
0463

Fuel level sensor circuit 
high input

An excessively high voltage from the sensor is 
sent to ECM.

SEF195Y

DTC P0462, P0463 FUEL LEVEL SENSOR

EC-395

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

ABS002LM

TBWA0294E

EC-396

DTC P0462, P0463 FUEL LEVEL SENSOR

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

ABS002LN

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

CHECK FUEL LEVEL SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.

2.

Turn ignition switch ON.

3.

Check voltage between “fuel level sensor unit and fuel pump”
terminal 5 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

119

R/L

Fuel level sensor

[Ignition switch: ON]

Approximately 0 - 4.8V
Output voltage varies with fuel 
level.

107

B

Fuel level sensor ground

[Engine is running]

Idle speed

Approximately 0V

PBIB1118E

PBIB1127E

Voltage: Battery voltage

PBIB0134E

 

 

 

 

 

 

 

Content   ..  424  425  426  427   ..