Air Flow Meter/Sensor: Testing and Inspection

CIRCUIT DIAGRAM





INSPECTION USING SCAN TOOL





HARNESS INSPECTION PROCEDURE

NOTE: When the vehicle is new [within initial operation of about 500 km (300 miles)], the volume air flow sensor output frequency may be about 10% higher.

TROUBLESHOOTING HINTS
1. If the engine stalls occasionally, crank the engine and shake the volume air flow sensor harness. If the engine stalls, check for the poor contact of the volume air flow sensor connector.
2. If the volume air flow sensor output frequency is other than 0 when the ignition switch is turned on (do not start the engine).
- Check for the faulty volume air flow sensor or engine control module.
3. If the engine can be idle even if the volume air flow sensor output frequency is out of specification, check for the following conditions:
- Disturbed air flow in the volume air flow sensor, disconnected air duct or clogged air cleaner filter.
- Poor combustion in the cylinder, faulty ignition plug, ignition coil, injector or incorrect compression.
- Air leaks in the intake manifold.
- Loose exhaust gas recirculation valve seat.