Sentra L4-1.8L (QG18DE) SULEV (2003)
3. Check voltage between ECM terminal 51 (Mass air flow sensor signal) and ground.
4. If the voltage is out of specification, proceed the following.
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Turn ignition switch "OFF".
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Disconnect mass air flow sensor harness connector and reconnect it again.
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Perform steps 2 and 3 again.
5. If NG, remove mass air flow sensor from air duct. Check hot film for damage or dust.
6. If NG, clean or replace mass air flow sensor.