What should I do if my MAF sensor is bad?
A bad MAF sensor will tend to have positive fuel trims at load. This is why I recommend testing fuel trims at a steady cruise when testing a MAF. Fuel trims may also be negative at idle with a bad or dirty MAF. Here is the data from our subject vehicle.
Can a fuel trim correction cause a MAF problem?
Large fuel trim corrections—either positive or negative—are often the only initial pointer to MAF sensor problems. Again, any and all air leaks downstream of the MAF sensor must be repaired first. Since accurate fuel trim corrections depend on correct O 2 sensor outputs, you must verify the functionality of these sensors first.
What is the diagnostic code for fuel trim malfunction?
Cost of diagnosing the P0170 code. P0170 is a diagnostic trouble code (DTC) for “Fuel Trim Malfunction (Bank 1)”.
Is the fuel control system centered on MAF or map?
Fuel control systems for most modern gasoline engines are centered either on MAF or MAP (manifold absolute pressure).
A bad MAF sensor will tend to have positive fuel trims at load. This is why I recommend testing fuel trims at a steady cruise when testing a MAF. Fuel trims may also be negative at idle with a bad or dirty MAF. Here is the data from our subject vehicle.
Large fuel trim corrections—either positive or negative—are often the only initial pointer to MAF sensor problems. Again, any and all air leaks downstream of the MAF sensor must be repaired first. Since accurate fuel trim corrections depend on correct O 2 sensor outputs, you must verify the functionality of these sensors first.
What does MAF mean on a car scan?
MAF is what the Mass Air Flow sensor is telling the engine computer. It’s a measurement of how much air is going into the engine. Are you reading in volts or grams per second or hertz? Oxygen sensor bank 1 sensor 1 is the input from that specific sensor.
Is the air temperature sensor part of the MAF sensor?
Depending on what vehicle you have, the intake air temperature sensor may actually be part of the MAF sensor. This is a common . . . but not universal . . . practice The “live data” scan tools can really help out with a difficult problem.