Volume Air Flow Circuit Malfunction

FAULT ID
P0100

TITLE
Volume Air Flow Circuit Malfunction

BACKGROUND
- While the engine is running, the volume air flow sensor outputs a pulse signal which corresponds to the volume of air flow.
- The engine control module checks whether the frequency of this signal output by the volume air flow sensor while the engine is running is at or above the specified value.

RANGE OF CHECK
Engine speed is 500 RPM's or more.

SET CONDITIONS
Sensor output frequency is 3 Hz or less for 4 seconds.

EFFECT
Limp-in
- Uses the throttle position sensor signal and engine speed signal (crankshaft position sensor signal) for basic injector drive time and basic ignition timing from the pre-set mapping.
- Fixes the IAC motor in the appointed position so idle air control is not performed.

PROBABLE CAUSES
- Volume air flow sensor failed.
- Open or shorted volume airflow sensor circuit, or loose connector.
- Engine control module failed.