4. Check MAF Sensor Ground Circuit For Open And Short

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 109.

   Refer to Wiring Diagram.

   1. Continuity should exist. 
4. Also check harness for short to ground and short to power.

OK or NG 

OK : GO TO 5.

NG : Repair open circuit or short to ground or short to power in harness or connectors.