Infiniti FX35, FX50 (S51). Manual — part 700
P0461 FUEL LEVEL SENSOR
EC-341
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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P0461 FUEL LEVEL SENSOR
Description
INFOID:0000000005236920
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:0000000005236921
DTC DETECTION LOGIC
NOTE:
• If DTC P0461 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P0461 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
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-341, "Component Function Check"
.
Use component function check to check the overall function of the fuel level sensor. During this check, a 1st
trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000005236922
1.
PRECONDITIONING
WARNING:
When performing the following procedure, always observe the handling of the fuel. Refer to
TESTING CONDITION:
Before starting component function check, preparation of draining fuel and refilling fuel is required.
Will CONSULT-III be used?
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.
1.
Prepare a fuel container and a spare hose.
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
EC-342
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P0461 FUEL LEVEL SENSOR
2.
Release fuel pressure from fuel line, refer to
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 0.03 V during step 7 to 10 and 10 to 12.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
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
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
Diagnosis Procedure
INFOID:0000000005236923
1.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
MWI-45, "CONSULT-III Function (METER/M&A)"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Go to
.
2.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
>> INSPECTION END
P0462, P0463 FUEL LEVEL SENSOR
EC-343
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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K
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M
A
EC
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P
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P0462, P0463 FUEL LEVEL SENSOR
Description
INFOID:0000000005236924
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:0000000005236925
DTC DETECTION LOGIC
NOTE:
• If DTC P0462 or P0463 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC
UXXXX.
• If DTC P0462 or P0463 is displayed with DTC P0607, first perform the trouble diagnosis for DTC
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 perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
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
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005236926
1.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
MWI-45, "CONSULT-III Function (METER/M&A)"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Go to
.
2.
CHECK 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.
EC-344
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P0462, P0463 FUEL LEVEL SENSOR
GI-36, "Intermittent Incident"
>> INSPECTION END
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