Diagnostic Trouble Codes Detecting Condition and Trouble Area

DTC DETECTING CONDITION AND TROUBLE AREA

DTC detecting condition	Trouble area
ECM calculates estimated mass airflow (MAF) from MAP and engine speed to monitor the MAF sensor. If the monitored MAF signal is less or more than the estimated MAF rate for 7 sec. continuously. Measured MAF; Intake air flow measured by MAF sensor. Calculated MAF; Intake air flow calculated by ECM using manifold absolute pressure, barometric pressure and engine speed. (2 driving cycle detection logic)	Air intake system (clog or leakage) High resistance in the sensor circuit MAF and IAT sensor MAP sensor ECM

DTC detecting condition

Trouble area

ECM calculates estimated mass airflow (MAF) from MAP and engine speed to monitor the MAF sensor. If the monitored MAF signal is less or more than the estimated MAF rate for 7 sec. continuously.
Measured MAF; Intake air flow measured by MAF sensor.
Calculated MAF; Intake air flow calculated by ECM using manifold absolute pressure, barometric pressure and engine speed. (2 driving cycle detection logic)

Air intake system (clog or leakage)
High resistance in the sensor circuit
MAF and IAT sensor
MAP sensor
ECM