Infiniti EX35. Manual - part 645

 

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Infiniti EX35. Manual - part 645

 

 

EC-322

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0461 FUEL LEVEL SENSOR

P0461 FUEL LEVEL SENSOR

Description

INFOID:0000000003133466

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:0000000003133467

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-136, "DTC Logic"

.

• If DTC P0461 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-338, "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

1.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-322, "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

NO

>> Go to 

EC-323, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000003133468

1.

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.

NO

>> GO TO 3.

2.

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-323

< COMPONENT DIAGNOSIS >

[VQ35HR]

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1.

Prepare a fuel container and a spare hose.

2.

Release fuel pressure from fuel line, refer to 

EC-538, "Inspection"

.

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 and wait at least 10 seconds then turn ON.

6.

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

7.

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

8.

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

9.

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

NO

>> Go to 

EC-323, "Diagnosis Procedure"

.

3.

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.

2.

Release fuel pressure from fuel line. Refer to 

EC-538, "Inspection"

.

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 ON.

6.

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

7.

Confirm that the fuel gauge indication varies.

8.

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

9.

Confirm that the fuel gauge indication varies.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-323, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003133469

1.

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

Refer to 

MWI-40, "CONSULT-III Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

MWI-57, "Diagnosis Procedure"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

EC-324

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0462, P0463 FUEL LEVEL SENSOR

P0462, P0463 FUEL LEVEL SENSOR

Description

INFOID:0000000003133470

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:0000000003133471

DTC DETECTION LOGIC

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-136, "DTC Logic"

.

• If DTC P0462 or P0463 is displayed with DTC P0607, first perform the trouble diagnosis for DTC

P0607.Refer to 

EC-338, "DTC Logic"

.

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

DTC CONFIRMATION PROCEDURE

1.

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at ignition
switch ON.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-324, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003133472

1.

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

Refer to 

MWI-40, "CONSULT-III Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

MWI-57, "Diagnosis Procedure"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0462

Fuel level sensor circuit 
low input

An excessively low voltage from the sensor is 
sent 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

P0463

Fuel level sensor circuit 
high input

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

P0462, P0463 FUEL LEVEL SENSOR

EC-325

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

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EC

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>> INSPECTION END

 

 

 

 

 

 

 

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