Nissan 22680-7B000 Mass Air Flow

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If in a testing of the sensor an individual discovers that the sensor is in good condition and its functioning is not causing a specific driveability problem, the wiring harness and the connectors situated between the sensor and the PCM should also be checked for open or short circuits. If no problems are identified, take the car to a dealer service department or an authorized auto repair shop. The Mass Airflow (MAF) sensor is fitted in the air intake duct Take for instance, the hot-wire sensing elements that is used to determine the molecular mass of air inflow into the engine. As air is over the hot wire it cools and this change in temperature is converted into an analog voltage signal to the PCM the PCM in turn calculates pulse width of the fuel injector needed for right air to fuel mixture. There are numerous problems that are associated with a bad MAF sensor ranging from surging, stalling, rough idle and other driveability complaints and the Electronic Engine Control system is known to be able to sense different problems with the MAF sensor and set a range of trouble codes. To verify power to the MAF sensor remove the connector of the sensor and place the positive probe of the voltmeter to the B+ terminal of the harness connector then the negative probe to the connector GND terminal, while the ignition should be on without turning the engine on the voltmeter, should read over 10 volts. When reconnecting the electrical connector, backprobe the MAF SIG and GND terminal with the voltmeter while starting the engine, expecting to see the reading to be between 1.0 and 1.7 volts at idle as the RPM increases the reading should go to between 1.7 and 3.0 volts. The customers should turn off the engine, unplug the MAF harness connector, and by using an ohmmeter, touch one probe to the MAF SIG terminal and the other probe to the GND terminal; if the circuit is open, it means that the hot-wire element is damaged. If voltage is correct, look at the wiring harness for opens or damaged part of it. If drivability issues remain and all test results are normal, the sensor should be taken to a professional workshop as voltage signal abnormalities cannot be detected with a voltmeter. For replacement, the plastic MAF sensor body and the metal air duct must be replaced simultaneously, since the two are bend together and it is not possible to replace them individually. Unplug the electrical connector of the MAF sensor, unbolt the clamp that anchors the sensor to the intake air duct, and then remove the four nuts connecting the sensor to the air cleaner housing before installing a new one with its electrical connector.

The Mass Airflow (MAF) sensor is located on the throttle body for four-cylinder models and in the air intake duct for V6 models, and it measures the molecular mass of incoming air by use of a hot-wire sensing element. This sensor detects air that passes over this wire, which then cools and changes into a voltage that is relayed to the Powertrain Control Module (PCM). The PCM uses this information to calculate the required fuel injector pulse width for producing a desired air/fuel ratio. Problems like surging, stalling, rough idling etc may be caused by MAF failure and it could lead to certain trouble codes being set in EEC system. Before checking MAF sensor operation, check power and ground circuits. Plug out MAF sensor electrical connector. With ignition turned ON (engine not running), connect positive voltmeter lead to B+ wire terminal of harness connector while connecting negative lead to suitable engine ground point. If not, assess EGGS relay and related circuits. Also recommended is checking the ground circuit for continuity between connector and PCM. On 3.5L V6 models, with ignition ON and using positive voltmeter lead connected to reference wire terminal and negative lead connected to suitable engine ground point should produce around 5.0 volts-if there is no reference voltage present then suspect possible wiring harness fault or need PCM diagnosis. Reconnect electrical connector to MAF sensor; backprobe MAF sensor signal wire terminal with suitable probe while connecting positive voltmeter lead to probe and negative lead to suitable engine ground point; with ignition key ON voltmeter should read less than 1.0 volt (for 2002-2003 3.5L models approximately 1 volt). When starting an engine at idle, expect a range from about 1.0 upwards of 1.8 volts, which will increase as engine rpm goes higher from 1.6 to 3.0 volts. Unfortunately, simulating driving conditions in your driveway is impossible; however, one must see the voltmeter's needle rising as the engine speed goes up and if this does not happen you need to either replace or check on other parts of the MAF sensor system such as wiring harness integrity. In case they are okay, it would be advisable to consult dealer's service department or any qualified repairer for a possible PCM diagnosis. Noteworthy is that even with normal voltage readings, some signal faults may not show up when using a voltmeter; nevertheless, a dealer service department or qualified repairer should perform a sensor test and these problems are undetectable with voltmeter yet still give rise to driveability issues. With four-cylinder models, the air filter housing has to be removed followed by unplugging the MAF sensor electrical connector then removing retaining screws that secure the MAF sensor to the throttle body allowing for replacement of sensor. Contrarily, for V6 models note that plastic MAF sensor body and air duct are an integrated assembly which cannot be taken apart as separating them will be impossible without damaging any of the components therefore never try to do this as it will destroy either part. Unplug electrical connector from MAF sensor; remove clamp securing sensor to intake air duct and extract four fasteners that hold sensor onto air filter housing so as to allow new unit installation and connection process flow smoothly.

The Mass Airflow (MAF) sensor is a crucial component that measures the molecular mass of incoming air. In four-cylinder models, it's usually situated on the throttle body, while in V6 models, it's found in the air intake duct.