DTC P0101 - MASS AIRFLOW SYSTEM PERFORMANCE Chevrolet Tahoe I

Note. For circuit reference (Схема №8) For connector and terminal identification, see CONNECTOR IDENTIFICATION.

Circuit Description

The Mass Airflow (MAF) sensor measures the amount of air entering the engine during a given time. PCM uses MAF sensor information to monitor EGR flow rates. A large quantity of air entering the engine indicates an acceleration, high load situation or no EGR flow, while a small quantity of air entering the engine indicates deceleration, idle or full EGR operation.

MAF sensor produces a frequency signal. DTC P0101 will be set if the signal from the MAF sensor does not match a predicted value based on engine coolant temperature, throttle angle and engine speed. DTC will also set when the following conditions are present

1. Engine is running.
2. Engine speed is 506-806 RPM.
3. Throttle angle is zero degrees.
4. The listed conditions are met for greater than 3 seconds.
5. The change in MAF sensor is less than a calculated value.