P0100

TROUBLESHOOTING PROCEDURE





CIRCUIT DIAGRAM





INSPECTION USING SCAN TOOL








HARNESS INSPECTION PROCEDURE

TROUBLESHOOTING HINTS
1. If the engine stalls occasionally, crank the engine and shake the VAF Sensor harness. If the engine stalls, check for the poor contact of the 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 the faulty VAF Sensor of 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.