Infiniti FX35 / FX45. Manual - part 411

DTC P0462, P0463 FUEL LEVEL SENSOR

EC-405

< SERVICE INFORMATION >

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DTC P0462, P0463 FUEL LEVEL SENSOR

Component Description

INFOID:0000000001326236

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 “unified meter and A/C amp.”. The “unified meter and A/C amp.”
sends the fuel level sensor signal to the ECM through CAN commu-
nication line.
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

INFOID:0000000001326237

NOTE:
• If DTC P0462 or P0463 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for

DTC U1000, U1001. Refer to 

EC-146

.

• If DTC P0462 or P0463 is displayed with DTC U1010, first perform the trouble diagnosis for DTC

U1010. Refer to 

EC-148

.

This diagnosis indicates the former, to detect open or short circuit malfunction.

DTC Confirmation Procedure

INFOID:0000000001326238

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.
1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-405, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326239

1.

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

DI-27, "CONSULT-III Function (METER/M&A)"

.

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

DI-19, "Fuel Level Sensor Signal Inspection"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-139

.

>> INSPECTION END

PBIB1569E

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

(CAN communication line is open or 
shorted)

• Harness or connectors

(Fuel level sensor circuit is open or short-
ed)

• Unified meter and A/C amp.
• Fuel level sensor

P0463
0463

Fuel level sensor circuit 
high input

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

EC-406

< SERVICE INFORMATION >

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DTC P0462, P0463 FUEL LEVEL SENSOR

Removal and Installation

INFOID:0000000001326240

FUEL LEVEL SENSOR

Refer to 

FL-4

.

DTC P0500 VSS

EC-407

< SERVICE INFORMATION >

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DTC P0500 VSS

Description

INFOID:0000000001326241

NOTE:
• If DTC P0500 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to 

EC-146

.

• If DTC P0500 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer

to 

EC-148

.

The vehicle speed signal is sent to the “unified meter and A/C amp.” from the “ABS actuator and electric unit
(control unit)” by CAN communication line. The “unified meter and A/C amp.” then sends a signal to the ECM
by CAN communication line.

On Board Diagnosis Logic

INFOID:0000000001326242

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode.

DTC Confirmation Procedure

INFOID:0000000001326243

CAUTION:

Always drive vehicle at a safe speed.
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:
Steps 1 and 2 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.

 WITH CONSULT-III

1.

Start engine (TCS switch or VDC switch OFF).

2.

Read “VHCL SPEED SE” in “DATA MONITOR” mode with CONSULT-III. The vehicle speed on CON-
SULT-III should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.
If NG, go to 

EC-408, "Diagnosis Procedure"

.

If OK, go to following step.

3.

Select “DATA MONITOR” mode with CONSULT-III.

4.

Warm engine up to normal operating temperature.

5.

Maintain the following conditions for at least 60 consecutive seconds.

6.

Check 1st trip DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0500
0500

Vehicle speed sensor 
(VSS)

The almost 0 km/h (0 MPH) signal from 
vehicle speed sensor is sent to ECM even 
when vehicle is being driven.

• Harness or connectors

(CAN communication line is open or shorted)

• Harness or connectors

(Vehicle speed signal circuit is open or shorted)

• Wheel sensor
• Unified meter and A/C amp.
• ABS actuator and electric unit (control unit) 

Detected items

Engine operating condition in fail-safe mode

Vehicle speed sensor

When the fail-safe system for vehicle speed sensor is activated, the cooling fan operates (High) while 
engine is running.

ENG SPEED

1,700 - 6,000 rpm

COOLAN TEMP/S

More than 70

°

C (158

°

F)

B/FUEL SCHDL

5.0 - 31.8 msec

Selector lever

Except P or N position

PW/ST SIGNAL

OFF

EC-408

< SERVICE INFORMATION >

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DTC P0500 VSS

7.

If 1st trip DTC is detected, go to 

EC-408, "Diagnosis Procedure"

.

Overall Function Check

INFOID:0000000001326244

Use this procedure to check the overall function of the vehicle speed sensor circuit. During this check, a 1st
trip DTC might not be confirmed.

 WITH GST

1.

Lift up drive wheels.

2.

Start engine.

3.

Read vehicle speed sensor signal in Service $01 with GST.
The vehicle speed sensor on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with
suitable gear position.

4.

If NG, go to 

EC-408, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326245

1.

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Refer to 

BRC-13

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace.

2.

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

DI-5

.

>> INSPECTION END