Code P0101, Mass Air Flow (MAF): Notes

Mass Air Flow (MAF) sensor measures flow of air which passes through it in a given time. Control module 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.

With Code P0101 set, control module will use a default value for airflow based on throttle position, IAC motor position and engine speed. Control module will illuminate Malfunction Indicator Light (MIL).

1. This step checks to see if control module 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 MAF signal circuit, or poor connection.
3. Verifies both ignition feed voltage and a good ground circuit are available.