DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE
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DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT
RANGE/PERFORMANCE
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Detect the malfunction of air flow sensor
output property. Judge Low side NG when the air flow voltage indicates
low value in spite of the driving condition that the air flow voltage
might be high; otherwise, judge High side NG when the air flow voltage
indicates high value in spite of the driving condition that the
air flow voltage might be low. Judge air flow sensor property NG
when the Low side or High side becomes NG.
(1)
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Air flow
sensor
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(3)
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Voltage
(V)
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(A)
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Air
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(2)
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Intake
air temperature sensor
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(4)
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Intake
air volume (kg/s)
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Secondary
Parameters
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Enable
Conditions
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Engine
coolant temperature
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≥ 70°C
(158°F)
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Perform the diagnosis continuously after
idling.
Abnormality Judgment
Judge NG when the continuous time of completing
the malfunction criteria below becomes more than the time needed
for diagnosis.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Low
side NG
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Output
voltage
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< 1.2
V
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Engine
speed
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≥ 2000
rpm
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Throttle
angle
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≥ 13°
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Intake
manifold pressure
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≥ 53.3
kPa (400 mmHg, 15.7 inHg)
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High
side NG
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Output
voltage
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≥ 2.66
V
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Engine
speed
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600 ←→ 900
rpm
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Throttle
angle
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< 2.44°
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Intake
manifold pressure
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< 40.0
kPa (360 mmHg, 11.8 inHg)
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Fuel
system diagnosis at normal
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2.66
V
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Fuel system
diagnosis when malfunctioning
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1.45 V
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Time Needed for Diagnosis:
Low side
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3 seconds
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High side
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10 seconds
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Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous driving cycles.
Normality Judgment
Judge OK the 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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Low
side NG
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Output
voltage
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≥ 1.2
V
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Engine
speed
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≥ 2000
rpm
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Throttle
angle
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≥ 13°
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Intake
manifold pressure
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≥ 53.3
kPa (400 mmHg, 15.7 inHg)
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High
side NG
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Output
voltage
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< 2.66
V
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Engine
speed
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600 ←→ 900
rpm
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Throttle
angle
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< 2.44°
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Intake
manifold pressure
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< 40.0
kPa (300 mmHg, 11.8 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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•
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Air flow meter: Engine load is normally calculated
by manifold pressure and engine speed; however, calculated only
by manifold pressure.
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•
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EVAP conc. learning (fuel): Not allowed
to learn.
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-
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At
normal: learned ignition timing value = knock F/B
timing value + whole learning timing value + partial learning
timing
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-
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At trouble: learned ignition timing
value = −3°CA (retard 3°CA)
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Knock F/B timing value = 0°CA
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Whole learning is not allowed.
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Partial learning is not allowed.
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ISC control: Make the open loop compensation
to be the given value (1 g (0.04 oz)/s). Stop calculating
the throttle sensor temperature compensation. (Hold the previous
value.)
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ECM OPERATING
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
