Circuit Description
Mass Airflow (MAF) sensor measures amount of air entering engine during a given time. PCM uses MAF sensor information for fuel delivery calculations. MAF sensor readings during acceleration are much higher than those during deceleration or idle.
PCM calculates what MAF sensor reading should be when received from sensor under certain conditions using engine speed (RPM), throttle position, and barometric pressure parameters. When certain test conditions are met, PCM will compare its calculated MAF value to actual value received from sensor. If difference is too great, DTC P0101 will set.
For duplication of DTC, ensure:
- Other DTCs are not set.
- Engine is running with EGR duty cycle and pintle position is at less than 50 percent.
- System voltage is 9-18 volts.
- Throttle angle is less than 50 percent.
- MAP and TP sensor values are steady.