DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR RANGE/PERFORMANCE
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DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR RANGE/PERFORMANCE
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Detect the tank pressure sensor output property
abnormality.
Judge NG when there is no pressure variation,
which should exist in the tank, considering the engine status.
(1)
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Connector
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(A)
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Output
voltage
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(C)
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To fuel
tank
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(2)
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Terminal
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(B)
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Input voltage
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(D)
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To atmospheric pressure switching solenoid
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Secondary
Parameters
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Enable
Conditions
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After
starting the engine
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60 second or more
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Fuel
level
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≥ 9.0litres (2.4 US gal, 2.0 Imp gal)
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Fuel
temperature
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< 35°C (95°F)
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Battery
voltage
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≥ 10.9 V
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Atmospheric
pressure
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> 75.1
kPa (563 mmHg, 22.2 inHg)
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•
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Perform the diagnosis continuously in 60 seconds
or more after starting the engine.
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•
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Be sure to check the fuel level and
fuel temperature.
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Abnormality Judgment
Judge NG when the malfunction criteria below
is completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Number
of times when the difference between the Max. fuel level and the
Min., fuel level every 60 seconds is 2litres(0.53 US gal, 0.44Imp
gal) or more (with enable condition completed)
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≥ 16
times
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Max. − Min.
tank pressure (with enable condition completed)
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< 0.05
kPa (0.375 mmHg, 0.02 inHg)
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Max. − Min.
fuel temperature (with enable condition completed)
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≥ 7°C
(12.6°F)
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If the fuel level (Max. − Min.)
in every 60 seconds is less than 2litres, extend 60 seconds
more and make judgment with the Max. and Min. fuel level in 120
seconds.
If the difference did not appear though the
time extended, extend the time (180, 240, 300 seconds) and continue
the judgment.
Diagnosis counter will count up when the
difference of fuel level (Max. − Min.) is more than 2litres.
Time Needed for Diagnosis:
1
minute × 16 times or more
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
two continuous drive cycles.
Normality Judgment
Judge OK when the malfunction criteria below
is completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Max. − Min.
tank pressure
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≥ 0.05
kPa (0.375 mmHg, 0.02 inHg)
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•
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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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Purge control solenoid valve control: Purge
fixation mode is prohibited.
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
