P0101

DTC P0101 - MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE

OUTLINE 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 then 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
- Airflow meter: Engine load is normally calculated by manifold pressure and engine speed; however, calculated only by manifold pressure. EVAP cone. learning (fuel): Not allowed to learn.
- Knock compensation:
- Knock compensation final timing advance and retard value = knock compensation + whole learning compensation value + partial learning compensation value.
- At normal: knock compensation = 0 °CA is fixed.
- At trouble: knock compensation NOT EQUAL TO 0 °CA is fixed. (Retard max. 12 °CA at knock.)
- Not allowed to update the whole learning compensation factor.
- Not allowed to calculate the partial learning zone compensation value.

- ISC control: Make the open loop compensation to be the given value (1 g/s). Stop calculating the throttle sensor temperature compensation. (Hold the previous value.)
- Purge control: Not allowed to purge.

ECM OPERATING AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)