How to Know the Defective Airflow?

How to know the Defective Airflow?

 

How to Know the Defective Airflow?

Model: Hyundai I30

Year of Model: 2011

2011  D 2.0 CRDI  Engine  Engine Control

Fuel: Diesel

Displacement: 2000cc

P0101 Mass or Volume Air Flow Circuit Range/Performance

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Study Guide and Component Location Study Guide and General Description Study Mass Air Flow Sensor (MAFS) is digital sensor. Measuring mass of air flow, signal is outputted as frequency(Hz). Study 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. Study 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. Thus,with the output signal change of MAFS accompanied by EGR actuator actuation, ECM determines the amount of recirculated EGR gas quantity. 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) 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) 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. Study Guide and 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. Fail Safe Fuel cut NO • - EGR Off YES Fuel Limit YES Check Lamp OFF Specification Intake air quantity (Kg/h) Output frequency ( KHz ) Deviation [ % ] 20°C 80°C 8 1.97 ± 3 10 2.01 2.01 ± 2 40 2.50 2.50 ± 2 105 3.20 3.20 ± 2 220 4.30 ± 2 480 7.80 7.80 ± 2 560 9.50 ± 3 Study , Study , Study , Study , Study , Study , Study , Study , Study , Study , Study