Faulty mass air flow maf sensor low frequency

The PCM calculates the air flow (grams per second) based on this signal. The MAF sensor requires a greater amount of current in order to maintain the hot wires at a constant temperature as the air flow increases. Does the scan tool indicate that this diagnostic failed this ignition? A bad mass air flow sensor may not always set a computer code. If the sensor is giving an erroneous reading, as long as it is within its allowable range, no computer code will be set.

Symptoms of a bad Mass Airflow Sensor Mass Air Flow Sensors

If anything is leaking, you will be able to tell immediately by the way the oxygen sensor responds to the carb cleaner being sucked into the engine, even if you cant hear the engine rpms change. Special operating conditions that need to be met before the PCM will run this diagnostic, where applicable, are listed in Conditions for Setting the. Symptoms of a bad MAF sensor is an engine that is hard to start or stalls immediately after starting. It consists of a hot film that is supplied with electric current from the Engine Control Module ( ECM ).

Symptoms - Engine Light ON (or Service Engine Soon Warning Light) - Engine stall - Engine running rough - Excessive fuel consumption - Excessive smoke. CHEVROLET Technical Service Bulletins for P0103 code. This is due to unmetered air entering the engine. OBDII Code List » P0103 CHEVROLET Possible causes Tech notes When is the code detected? The temperature of the hot film is controlled by the.

DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency

This diagnostic tests for too low an airflow rate. With the same live data feed, monitor your oxygen sensor data. The MAF sensor requires a greater amount of current in order to maintain the hot wires at a constant temperature as the air flow increases. ECM detects the air flow by means of this current change. Start the engine and operate the vehicle within the conditions required for this diagnostic to run, and as close to the conditions recorded in Freeze Frame/Failure Records as possible. The PCM monitors the MAF sensor frequency. In many cases a mass airflow sensor may be blamed for your problem when it is doing its job just fine. You will notice that your engine may be running with a rich fuel trim as the oxygen sensors will be giving the PCM feedback that the current program is too lean. However, scanning your computer codes is a good place to start. 3 Turn the ignition ON, engine OFF, review Freeze Frame and/or. P0103 CHEVROLET Description The Mass Air Flow (MAF) sensor measures the amount of air ingested by the engine. The more air, the greater the heat loss.

The P0103 code is set when the Powertrain Control Module (PCM) detects that the Mass Air Flow (MAF) sensor frequency is above a predetermined value. 3 Turn the ignition ON, engine OFF, review Freeze Frame and/or. It consists of a hot film that is supplied with electric current from the Engine Control Module ( ECM ). T OBD Codes Comments Powered by Disqus.