Air Flow Meter/Sensor: Testing and Inspection
DIAGNOSTIC CODES: P0101, P0102, P0103Mass Air Flow Sensor (MAFS):
Monitoring Procedure
The range is checked for values outside the limits.
No signal (open circuit) at any time with the ignition on, or a high signal output below a set engine speed, will be registered as a fault. A low signal test will check for an air meter output consistent with other engine parameters. If these tests are not passed then a fault event is recorded and if the count exceeds a given limit then a fault is registered.
While fault counting is in progress a back-up value of airflow will be supplied and when faults are present a default value of airflow, calculated from throttle position, engine speed and inlet air temperature, will be supplied. The strategy will report to the Diagnostic Status Manager (DSM) when all the tests have been performed once; the DSM will then decide whether to store a fault code and illuminate the MIL lamp.