P0101 Mass or Volume Air Flow A Circuit Range/Performance > General Information
General Description
Intake Air Temperature Sensor(IATS) is hot film sensor and senses mass air flow.
ECM performs EGR system feed back control with the information of measured mass air flow. (The role of MAFS in diesel engine is different from gasoline engine. Fuel injection quantity is decided by MAFS signal in gasoline engine.)
When EGR gas(contains no oxygen) flowing into combustion chamber increases, the air passing through MAFS(contains oxygen) decreases. Thus, with the output signal change of MAFS accompanied by EGR actuator actuation, ECM determines the amount of recirculated EGR gas quantity.
NOx is produced from the reaction of nitrogen and oxygen.
If least intake air required for complete combustion flows into combustion chamber by controlling EGR gas(contains no oxygen) which is recirculated to combustion chamber, NOx decreases because there is no supplementary oxygen to react with nitrogen.
DTC Description
P0101 is set when MAFS output value(mg/stroke) at nomal condition is too abnormal. This code is due to 1)excessive leakage of intake system such as unplugged inter-cooler hose or 2)excessive boosting at turbo-charger or 3)the failure of MAFS component.
Item
Detecting Condition
● Output value of MAFS(mg/stroke)is below the minimum value recoded at ECM
● Output value of MAFS(mg/stroke)is above the maximum value recoded at ECM
Possible Cause
● Leakage of intake system
● Excessive boosting of turbo charger
● MAFS component

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