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. Inspect for any vacuum leaks downstream of the MAF sensor.Ī wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. Then start with the cheapest, easiest repair procedures:Īn 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:Ī low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Possible SolutionsThe simplest thing to do is to reset the code and see if it comes back. SymptomsYou will likely not notice any serious drivability problems, although there may be symptoms. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds. What does that mean?Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. Technical DescriptionMass Air Flow (MAF) Circuit Range/Performance Problem To lookup your particular code, visit our OBD Trouble Codes section. For example,a P0171 code means P0171 - System Too Lean (Bank 1).
Third Digit - Sub-SystemThe third digit denotes the type of sub-system that pertains to the codeįourth and Fifth DigitsThese digits, along with the others, are variable, and relate to a particular problem. Second Digit - Code TypeThe second digit identifies whether the code is a generic code (same on all OBD-II equpped vehicles), or a manufacturer specific code.Ġ = Generic (this is the digit zero - not the letter "O") Here is a breakdown of what each digit of the code means:įirst Character - SystemThe first character identifies identifies the system related to the trouble code.
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