If you suspect the condition may be related to aftermarket accessories, refer to Checking Aftermarket Accessories in Wiring Systems. Any loss of vacuum to the MAP sensor can cause this DTC to set. Infiniti G37 Mass Air Flow Sensors Reviews 1 review 5 of 5 So Far So Good CRS - Mass Air Flow Sensor Haven't had them in long, but so far no problems. A high resistance on the ground circuit of the MAP sensor can cause this DTC to set. This was the reading aaMAF sensor circuit low input Probable cause aa1-Open or short circuit condition aa-Poor electical connection aa3-Vacuum leak aa4-faulty MAF sensor Any help on how to fix this will be appreciated. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude. Could it also cause the check engine light to come on because not enough air is going to the MAF sensor. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. The value shown for the MAP sensor display varies with the altitude. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. When the engine is running the MAP sensor value is continually updated near WOT. The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. Inspect for any vacuum leaks downstream of the MAF sensor. Then start with the cheapest, easiest repair procedures: Inspect for the following conditions: An incorrectly routed harness–Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components: – The secondary ignition wires or coils – Any solenoids – Any relays – Any motors A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. My point being, I was ready to buy a K&N air filter. I work for an automotive company, but I'm not that into my car. The representative continued to explain the company's lengthy product testing process. The simplest thing to do is to reset the code and see if it comes back. Of the 2,500,000 filters K&N sells a year, they encounter less than 200 dealership problems annually.
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