Code P0101, Mass Air Flow (MAF) Sensor Circuit: Notes

Mass Airflow (MAF) sensor measures flow of air which passes through it in a given time. PCM uses this information to monitor operating condition of engine for fuel delivery calculations. A large quantity of air movement indicates acceleration, while a small quantity indicates deceleration or idle. MAF sensor produces a frequency signal, which cannot be easily measured. Diagnose sensor using procedures on this chart.

Code P0101 will set when the following conditions are present.

• Engine is running.
• No MAF signal for over 4 seconds.
  NOTE: Test numbers refer to numbers on diagnostic chart.

1. Checks to see if PCM recognizes a problem.
2. Voltage reading at sensor harness terminal "A" of less than 4 volts or greater than 6 volts indicates a fault in Mass Airflow (MAF) sensor circuit, or poor connection.
3. Verifies both ignition feed voltage and a good ground circuit are available.