P0101 (U5/Low Emissions)
DTC P0101 - MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCEOUTLINE OF DIAGNOSIS
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.
COMPONENT DESCRIPTION
ENABLE CONDITION
GENERAL DRIVING CYCLE
Perform the diagnosis continuously after idling.
DIAGNOSTIC METHOD
- Abnormality Judgment
Judge NG when the continuous time of completing the malfunction criteria becomes more than the time needed for diagnosis.
- Normality Judgment
Judge OK the when the malfunction criteria are completed.
DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
FAIL SAFE
- Air flow meter: Engine load is normally calculated by manifold pressure and engine speed; however, calculated only by manifold pressure.
- EVAP conc. learning (fuel): Not allowed to learn.
- Knock compensation:
- At normal: learned ignition timing value = knock F/B timing value + whole learning timing value + partial learning timing
- At trouble: learned ignition timing value = -3 °CA (retard 3 °CA)
- knock F/B timing value = 0 °CA
- Whole learning is not allowed.
- Partial learning is not allowed.
- 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.)
ECM OPERATING AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)