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Infiniti G35 (V35) Sedan. Manual - part 544

EC-322

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0456 EVAP CONTROL SYSTEM

Wipe clean valve housing.

Check valve opening pressure and vacuum.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 2.

REPLACE FUEL FILLER CAP

Replace fuel filler cap.

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may
come on.

>> INSPECTION END

SEF445Y

Pressure:

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm

, 2.22 -

2.90 psi)

Vacuum:

−

6.0 to

−

3.3 kPa (

−

0.061 to

−

0.034 kg/cm

−

0.87 to

−

0.48 psi)

SEF943S

P0460 FUEL LEVEL SENSOR

EC-323

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0460 FUEL LEVEL SENSOR

Description

INFOID:0000000000956694

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 communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.

DTC Logic

INFOID:0000000000956695

DTC DETECTION LOGIC

NOTE:
• If DTC P0460 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to

EC-137, "DTC Logic"

• If DTC P0460 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer

EC-138, "DTC Logic"

When the vehicle is parked, naturally the fuel level in the fuel tank is stable. It means that output signal of the
fuel level sensor does not change. If ECM senses sloshing signal from the sensor, fuel level sensor malfunc-
tion is detected.

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

Start engine and wait maximum of 2 consecutive minutes.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

EC-323, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956696

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

Refer to

MWI-37, "CONSULT-III Function (METER/M&A)"

Is the inspection result normal?

YES

>> GO TO 2.

>> Go to

MWI-53, "Diagnosis Procedure"

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "Intermittent Incident"

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0460

Fuel level sensor circuit
noise

Even though the vehicle is parked, a signal be-
ing varied is sent from the fuel level sensor to
ECM.

• Harness or connectors

(The CAN communication line is open or
shorted)

• Harness or connectors

(The sensor circuit is open or shorted)

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

EC-324

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0461 FUEL LEVEL SENSOR

P0461 FUEL LEVEL SENSOR

Description

INFOID:0000000000956697

DTC Logic

INFOID:0000000000956698

DTC DETECTION LOGIC

NOTE:
• If DTC P0461 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to

EC-137, "DTC Logic"

• If DTC P0461 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer

EC-138, "DTC Logic"

Driving long distances naturally affect fuel gauge level.
This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has
been driven.

DTC CONFIRMATION PROCEDURE

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-324, "Component Function Check"

Use component function check to check the overall function of the fuel level sensor function. During this
check, a 1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-325, "Diagnosis Procedure"

Component Function Check

INFOID:0000000000956699

PRECONDITIONING

WARNING:

When performing following procedure, be sure to observe the handling of the fuel. Refer to

FL-10,

"Removal and Installation"

TESTING CONDITION:
Before starting component function check, preparation of draining fuel and refilling fuel is required.

Do you have CONSULT-III?

YES

>> GO TO 2.

>> GO TO 3.

PERFORM COMPONENT FUNCTION CHECK

With CONSULT-III

NOTE:
Start from step 10, 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.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0461

Fuel level sensor circuit
range/performance

The output signal of the fuel level sensor does
not change within the specified range even
though the vehicle has been driven a long dis-
tance.

• Harness or connectors

(The CAN communication line is open or
shorted)

• Harness or connectors

(The sensor circuit is open or shorted)

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

P0461 FUEL LEVEL SENSOR

EC-325

< COMPONENT DIAGNOSIS >

[VQ35HR]

Prepare a fuel container and a spare hose.

Release fuel pressure from fuel line, refer to

EC-543, "Inspection"

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

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

Turn ignition switch OFF and wait at least 10 seconds then turn ON.

Select “FUEL LEVEL SE” in “DATA MONITOR” mode with CONSULT-III.

Check “FUEL LEVEL SE” output voltage and note it.

Select “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-III.

Touch “ON” and drain fuel approximately 30 (7-7/8 US gal, 6-5/8 Imp gal) and stop it.

10. Check “FUEL LEVEL SE” output voltage and note it.
11. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal).
12. Check “FUEL LEVEL SE” output voltage and note it.
13. Confirm whether the voltage changes more than 0.03V during step 7 to 10 and 10 to 12.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-325, "Diagnosis Procedure"

PERFORM COMPONENT FUNCTION CHECK

Without CONSULT-III

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.

Release fuel pressure from fuel line. Refer to

EC-543, "Inspection"

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