Air Flow Meter/Sensor: Testing and Inspection

CIRCUIT DIAGRAM

ECM Connector:

TROUBLESHOOTING PROCEDURES





USING SCAN TOOL





USING VOLTMETER





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

HARNESS INSPECTION PROCEDURES

















TROUBLESHOOTING HINTS
1. If the engine stalls occasionally, crank the engine and shake the Mass Air Flow (MAF) sensor harness. If the engine stalls, check the poor contact of the MAF sensor connector.
2. If the MAF sensor output voltage is other than 0 when the ignition switch is turned on (do not start the engine). Check for the faulty MAF sensor or Engine Control Module (ECM).
3. If the engine will idle even if the MAF sensor output voltage is out of specification check for the following conditions;
- Disturbed air flow in the MAF sensor Disconnected air duct, clogged air cleaner filter.
- Poor combustion in the cylinder.
- Faulty ignition plug, ignition coil, injector, incorrect comparison.
- Air leaks in the intake manifold.