Circuit Description

This test determines if Mass Airflow (MAF) sensor circuit failed, by monitoring the MAF signal. MAF sensor is a high-frequency device that measures the rate of airflow through the throttle body. MAF sensor outputs a series of pulses that varies in frequency with airflow. PCM uses this signal for fuel control.

DTC will set if PCM detects a signal circuit frequency higher than the possible range of a normally operating MAF sensor.

For duplication of DTC, ensure:

• No TP senor, MAP sensor or system voltage DTCs are set.
• Engine speed greater than 400 RPM.
• System voltage greater than 10.5 volts.
• MAF sensor signal is greater than 11,000 Hz for 3 seconds.