Nissan 22680-AM600 Mass Air Flow Meter Sensor Assembly

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There is a Mass Airflow (MAF) sensor situated in the air intake duct that measures the molecular mass of incoming air using a hot-wire sensing element. It then turns the voltage signal into a temperature caused by passing air over the wire. Driveability problems like surging, stalling, and rough idle may be linked with a faulty MAF sensor. First check on MAF sensor operations by checking power and ground circuits. To check for continuity to ground on black terminal disconnect electrical connector. In this case, connect your voltmeter to appropriate wire terminal. When using older models make sure you check for continuity to ground on black wire terminal as well. Put back the electric connector after back probing through white wire terminal. The meter should indicate less than 0.5 volt (1993 and 1994) or less than 1.0 volt (1995 and later). Start the engine and check the voltage, which should be 1.0 to 1.7 volts at idle and increase as the engine rpm increases. If these readings show up correctly then there is nothing wrong with your MAF sensor conductance hence it is working properly; otherwise replace it. The wiring harness has to be checked for open circuits or damage to see if they are still good so that qualified repair shop can diagnose he PCM in case they are working fine or not. Disconnect the electrical connector before removing clamp and fasteners holding down the sensor fastener so as to replace Mass Airflow Sensor.