Sonata GL V6-3.0L (1997)
Air Flow Meter/Sensor: Testing and Inspection
CIRCUIT DIAGRAM
TROUBLESHOOTING HINTS
1. If the engine stalls occasionally, crank the engine and shake the VAF Sensor harness. If the engine stalls, check for poor contact of VAF Sensor
connector.
2. If the VAF Sensor output frequency is other than 0 when the ignition switch is turned on (do not start the engine), check for faulty VAF Sensor or
ECM.
3. If the engine can be idle even if the VAF Sensor output frequency is out of specification, check for the following conditions:
-
Disturbed air flow in the VAF Sensor. Disconnected air duct, clogged air cleaner filter.
-
Poor combustion in the cylinder. Faulty ignition plug, ignition coil, injector,. incorrect compression.
-
Air leaks in the intake manifold.
-
Loose EGR valve seat.
Using GST
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.
