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 MAF sensor output drops to less than 1135 Hz for at least 3 seconds.

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.