How Code P0101 Sets a Trouble?

How Code P0101 Sets a Trouble?

 

2011  D 2.0 CRDI  Engine  Engine Control  P0101 Mass or Volume Air Flow Circuit Range/Performance

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Component Location Study guide and General Description Study Mass Air Flow Sensor (MAFS) is digital sensor. Study Measuring mass of air flow, signal is outputted as frequency(Hz). ECM performs EGR system feed back control with the information of measured mass air flow. Study (The role of MAFS in diesel engine is different from gasoline engine. Fuel injection quantity is decided by MAFS signal in gasoline engine.) Study When the amount of EGR gas(contains no oxygen) flowing into combustion chamber increases, the air passing through MAFS(contains oxygen) decreases. Study Thus, with the output signal change of MAFS accompanied by EGR actuator actuation, ECM determines the amount of recirculated EGR gas quantity. Study Guide Notice Study NOx is produced in the reaction of nitrogen and oxygen. Study If least intake air required for complete combustion flows into combustion chamber by controlling EGR gas(contains no oxygen) Study which is recirculated to combustion chamber, NOx decreases because there is no supplementary oxygen to react with nitrogen. Study Guide and DTC Description P0101 is set 1)Study when Air mass ratio(real/threshold) above 1.5 or below 0.85 is detected for more than 10 sec.. or 2) short to battery or ground in MAFS or IATS signal circuit is detected for more than 0.58 sec. or 3) short to low or high voltage line in IATS signal circuit is detected for more than 0.6 sec. DTC Detecting Condition Item Detecting Condition Possible Cause Study DTC Strategy • Voltage monitoring • MAFS circuit • MAFS component Study Enable Conditions • Engine running Study Threshold Value • Air mass ratio(real/threshold) above 1.5 or below 0.85 - 12 sec. • Short to low or high voltage line in IATS signal circuit - 0.6 sec. • Shrot to battery or ground in MAFS or IATS circuit - 0.58 sec. Study Diagnostic Time • Refer to threshold Value. Study Fail Safe Fuel cut NO • - Study EGR Off YES Study Fuel Limit YES Study Check Lamp OFF