What does the p0103 mass air flow code mean?
P0103 Mass Air Flow High Frequency. Lean and/or Rich code (s). Fuel Trim code (s). A tremendous lack of power upon acceleration. Black smoke coming from the tail-pipe. Vehicle may idle rough and stall.
What is the rich code on the GM MAF sensor?
P0102 Mass Air Flow Low Frequency. P0103 Mass Air Flow High Frequency. Lean and/or Rich code (s). Fuel Trim code (s). A tremendous lack of power upon acceleration. Black smoke coming from the tail-pipe. Vehicle may idle rough and stall.
How does MAP sensor work on GM 4.3L?
Ground the black multimeter test lead directly on the battery negative terminal. Turn the key on but don’t start the engine. This will enable the manifold absolute pressure (MAP) sensor to get power in the form of 5 Volts and Ground from the PCM (Powertrain Control Module= Fuel Injection Computer).
Can a bad MAF sensor leave a GMC Sierra running rough?
A bad mass airflow sensor can leave your GMC Sierra’s engine running rough, or even inoperable. A MAF sensor measures the density of the air entering the intake manifold.
What does the MAF sensor on a GMC Sierra do?
A MAF sensor measures the density of the air entering the intake manifold. It passes this information onto your Sierra’s ECU. The ECU uses this information along with other sensor data to control the amount of fuel that enters the combustion chamber. If you do determine that you need a new mass airflow sensor, they aren’t too expensive.
How is a MAP sensor connected to the intake manifold?
Some MAP sensors are connected to the intake manifold by a hose. Check that the MAP sensor hose is connected and intact. Also, check that the port is free of carbon deposits or other debris, which could block the hose and lead to poor MAP sensor readings. Sensor.
What happens when the MAF sensor goes bad?
If the MAF sensor has gone bad, it’ll trigger the check engine light and provide an OBDII trouble code. This is great because it helps you narrow down the problem. The two most common trouble codes in relation to the MAF sensor are: There are other codes related to the mass air flow sensor as well, but these are the most common ones.
What does the p0171 stand for on a car?
The P0171 refers to a possible lack of fuel pressure, a leak in the intake air system, or a possible vacuum leak. The P0102 also leans towards a leak in the intake air system.