MAF SENSOR CIRCUIT LOW FREQUENCY
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 received
from sensor under certain conditions using engine speed (RPM),
throttle position, and altitude parameters. When these test conditions
are met, PCM will compare its calculated MAF value to actual value
received from sensor.
You may notice a decrease in power or some sluggishness.
- MAF may be disconnected
- MAF sensor may be damaged
The simplest thing to do is to reset the code and see if it comes back.