mass air flow sensor problems chevy impala

Use a scan tool to monitor real-time sensor values from the MAF sensor, O2 sensors, etc.

A low minimum air rate through the sensor bore may cause this DTC to setĪt idle or during deceleration.

Loss of vacuum to the MAP sensor can trigger this DTC.

If the air intake system has a mesh in it, make sure that is also clean (VWs mainly).

Carefully clean the MAF using MAF cleaner spray is generally a good DIY friendly diagnostic/repair step.

Visually *closely* inspect the MAF sensor wires or film to see if you can see contamination such as dirt, dust, oil, etc.

Visually inspect for any obvious air leaks in the air intake system.

Visually inspect all MAF sensor wiring and connectors to make sure they are intact, not frayed, broken, routed too close to ignition wires/coils, relays, motors, etc.

Possible diagnostic and repair steps include: You may have misfire codes or O2 sensor codes, so it's important to take a 'big picture' look at how the systems work together and effect each other when doing a diagnosis. Note that other codes may be present if you have a P0101.

Clogged catalytic converter on some models (GMC/Chevrolet mainly).

MAF sensor electrical harness or wiring problem (open, shorted, frayed, poor connection, etc.).

Dirty or contaminated mass air flow sensor.

Potential causes for this trouble code may include:

Engine hard start or stalling after it starts.

Malfunction indicator lamp (MIL) illumination (a.k.a.

P0104 Mass or Volume Air Flow 'A' Circuit Intermittent.

Or Volume Air Flow 'A' Circuit High Input

P0100 Mass or Volume Air Flow 'A' Circuit Malfunction.

Note: Some MAF sensors also incorporate an air temperature sensor, which is another value used by the PCM for optimal engine operation.Ĭlosely related MAF circuit trouble codes include: Is not within a predetermined expected range of the calculated MAF value.

The PCM detects that the actual MAF sensor frequency signal

The powertrain control module (PCM) uses that reading along with other sensor parameters to ensure proper fuel delivery at any given time for optimum power and fuel efficiency.īasically this P0101 diagnostic trouble code (DTC) means that there is a problem with the Mass Air Flow (MAF)

Mass air flow sensor problems chevy impala