DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT
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DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT
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Detect the malfunction of unstable output
from fuel level sensor caused by noise.
Judge NG when the max. value and cumulative
value of output voltage variation of fuel level sensor is larger than
the threshold value.
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Secondary
Parameters
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Enable
Conditions
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Engine
speed
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≥ 500
rpm
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After
engine starting
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1
second or more
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Ignition
switch
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ON
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Battery
voltage
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> 10.9
V
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Idle
switch
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ON
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Fuel
level
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9 ←→ 51 litres (2.4 ←→ 13.4
US gal, 1.98 ←→ 11.2 Imp gal)
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Vehicle
speed = 0 km/h (0 MPH)
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10 seconds
or more
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|
•
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Perform the diagnosis continuously in idling
condition.
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•
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Pay attention to the fuel level.
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Calculate the Max. value (delflmax) and cumulative
value (sumfl) of output voltage variation of fuel level sensor during
4,369 milliseconds. Judge it normal when both max. and cumulative
values are not over the threshold value. Otherwise, when either
of them is over the threshold value, count the diagnosis counter
up. And judge NG if the counter indicated 6 counts.
Abnormality Judgment
Judge NG when the malfunction criteria below
are completed.
Judgment
Value
|
Malfunction
Criteria
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Threshold
Value
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Integrated
times of the condition reaching follows,
DELFLMAX ≥ 0.2 V or SUMFL ≥ 5 V
where,
DELFLMAX is Max. deviation of sensor output during 4,369 milliseconds.
SUMFL is integrated value of sensor output deviation during
4,369 milliseconds.
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≥ 6
times
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Do not count the diagnosis counter up when
the following conditions are completed during 4,369 milliseconds.
Max − Min
of tank pressure during 4,369 milliseconds
|
≥ 0.05
kPa (0.375 mmHg, 0.02 inHg)
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Max − Min
of battery voltage during 4,369 milliseconds
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≥ 0.4
V
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Time Needed for Diagnosis:
4,369
milliseconds × 6 times
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous driving cycles.
Normality Judgment
Judge OK and clear the NG when the malfunction
criteria below are completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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DELFLMAX
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< 0.2
V
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SUMFL
Where, DELFLMAX is Max. deviation of sensor output during
4,369 milliseconds. SUMFL is integrated value of sensor output deviation
during 4,369 milliseconds.
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< 5
V
|
|
•
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When the OK idling cycle was completed 40 times
in a row
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|
•
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When “Clear Memory” was
performed
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MALFUNCTION
INDICATOR LIGHT CLEAR CONDITION
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•
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When the OK driving cycle was completed 3 times
in a row
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•
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When “Clear Memory” was
performed
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None
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
