P0103

CIRCUIT DESCRIPTION
The Mass Air Flow (MAF) sensor measures the amount of air entering the engine during a given time. The VCM uses the Mass Air Flow information for fuel delivery calculations. A large quantity of air entering the engine indicates an acceleration or high load situation, while a small quantity of air indicates deceleration or idle.

The MAF sensor produces a frequency signal which a scan tool can monitor. The frequency varies within a range of around 5 to 7 g/s at idle to near 125 g/s at maximum engine load. This DTC sets if the signal from the MAF sensor is above the possible range of a normally operating MAF sensor. This DTC is a type A DTC.

CONDITIONS FOR SETTING THE DTC
Power Up Test
^ The engine is off.
^ The ignition is ON for 0.7 seconds.
^ The MAF is at least 300 g/s.

High Frequency Test
^ The engine is running.
^ Engine Run Time is at least 2 seconds.
^ System voltage is at least 10 volts.
^ Throttle Position is less than 89.8%.
^ The MAF sensor is at least 300 g/s.
^ Above conditions present for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The VCM illuminates the Malfunction Indicator Lamp (MIL) the first time the fault is detected.
^ The VCM calculates an airflow value based on Idle Air Control (IAC) valve position, throttle position, engine speed and barometric pressure.
^ The VCM stores conditions which were present when the DTC set as the Freeze Frame and the Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The VCM turns the MIL off on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
^ A history DTC clears after 40 consecutive warm-up cycles have occurred without a fault.
^ Using the scan tool Clear Info function or disconnecting the VCM battery feed clears the DTC.