DTC P0181 FUEL TEMPERATURE SENSOR “A” CIRCUIT RANGE/PERFORMANCE
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DTC P0181 FUEL TEMPERATURE SENSOR “A” CIRCUIT
RANGE/PERFORMANCE
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Detect the malfunction of fuel temperature
sensor output property. Perform the diagnosis in two methods; namely,
drift diagnosis and stuck diagnosis. Judge NG when either of them
results in NG, and judge OK when both of them result in OK.
Drift Diagnosis
Normally fuel temperature is lower than engine
coolant temperature. When the fuel temperature becomes higher than
the engine coolant temperature, the range is considered to be shifted,
and make an NG judgment.
(A)
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Resistance
(Ω)
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(B)
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Fuel temperature °C
(°F)
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Secondary
Parameters
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Enable
Conditions
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None
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Always perform the diagnosis continuously.
Abnormality Judgment
Judge NG when the continuous time of completing
the malfunction criteria below becomes more than 120 seconds.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Fuel
level
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≥ 9.0 litres (2.38
US gal, 1.98 Imp gal)
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After
engine starting
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20
seconds or more
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Engine
coolant temperature − engine coolant temperature at engine
starting
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> 10°C
(18°F)
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Fuel
temperature − engine coolant temperature
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≥ 10°C
(18°F)
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Battery
voltage
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> 10.9
V
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Time Needed for Diagnosis:
120
seconds
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous driving cycles.
Normality Judgment
Judge OK 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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Fuel
level
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≥ 9.0 litres (2.38
US gal, 1.98 Imp gal)
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After
engine starting
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20
seconds or more
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Engine
coolant temperature − engine coolant temperature at engine
starting
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> 10°C
(18°F)
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Fuel
temperature − engine coolant temperature
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< 10°C
(18°F)
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Engine
coolant temperature
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< 75°C
(167°F)
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Battery
voltage
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> 10.9
V
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Stuck Diagnosis
If the fuel temperature which might rise
along with the engine idling (the cumulative amount of intake air
after engine starting is large) does not increase, the engine is
considered to be stuck and make an NG judgment.
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Secondary
Parameters
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Enable
Conditions
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After
engine starting
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20
seconds or more
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Battery
voltage
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> 10.9
V
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Perform the diagnosis continuously in 20
seconds or more after starting the engine.
Abnormality Judgment
Judge 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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Accumulated
amount of intake air
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≥ 551
kg (1215 lb)
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Fuel temperature
difference between Max. and Min.
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< 2°C
(3.6°F)
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Time Needed for Diagnosis:
To
be determined.
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous driving cycles.
Normality Judgment
Judge OK 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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Accumulated
amount of intake air
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≥ 551
kg (1215 lb)
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Fuel temperature
difference between Max. and Min.
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< 2°C
(3.6°F)
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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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None
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ECM OPERATING
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
