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1. #2003 CHEVY SILVERADO MASS AIR FLOW SENSOR PROBLEMS HOW TO#
2. #2003 CHEVY SILVERADO MASS AIR FLOW SENSOR PROBLEMS CODE#

There are two wires that are needed to power your Mass Air Flow Sensor on this GM 5.7 liter engine.Īs you can see, Pin 4 and Pin 3 are the two power and ground wires that you will need to test first. If your ignition is not turned to the “ON” position, do this now, but make sure your engine is not running. There are two wires that you’ll need to check for power to see if your MAF is indeed turning on with the key set to the “ON” position. Testing the Mass Air Flow Sensor for Power With this white locking tab pulled out and free, you can now unplug your MAF and inspect the connector.īefore we begin testing your mass air flow sensor, let’s take some time to look at the wires and what they are for your connector. Once you have pulled out the white tab, you should hear a slight click as the internal locking clip comes free. Once you have located your mass air flow sensor, pull the white locking tab up and out of the connector. Your GM PCM will use this value along with other vital engine sensor outputs to orchestrate your engine spark and fuel delivery. The mass airflow sensor reads the incoming air charge, along with other values such as air intake temperature, barometer, and others to accurately feed the PCM the data that it needs. To begin testing your MAF, you will need a multimeter and to locate the sensor itself, which should be located next to your air box. Your 5.7 liter GM mass air flow sensor ( MAF ) is connected by way of a five pin weatherproof engine plug that connects the MAF to the Powertrain Control Module (PCM).

#2003 CHEVY SILVERADO MASS AIR FLOW SENSOR PROBLEMS HOW TO#

How To Test Your MAF ( GM 5.7 Liter – LM7 Engine ) I’ll be showing you how to Test Your MAF in your 5.7 liter GEN III GM engine, and giving you a step by step guide on what to look for when troubleshooting your MAF for the Silverado P0171 OBDII DTC Trouble Code.

#2003 CHEVY SILVERADO MASS AIR FLOW SENSOR PROBLEMS CODE#

Today I’ll be showing you how to test, diagnose and troubleshoot the Silverado P0171 OBDII Trouble Code. There’s a number of reasons that this can be happening in your Silverado.

This error can cause driveability issues because the PCM sees the engine running without enough fuel, and cannot compensate correctly. When your Silverado P0171 trouble code is triggered, your Chevy Malfunction Indicator Lamp (MIL) will turn on. To begin fixing Silverado P0171 issues, we will start with the mass air flow sensor. The P0171 GM OBDII DTC Trouble Code relates to the Powertrain Control Module (PCM) seeing too much air from the upstream oxygen sensor.

Not to worry, because today I’ll be showing you how to clear your Silverado check engine light and fix your P0171 trouble code. Problem is, you aren’t sure how to fix Silverado P0171 problems in your Chevy truck. Using an OBDII scan tool, you have been able to identify an existing Silverado P0171 trouble code. Your Silverado isn’t running right, and to make things worse the check engine light is brightly lit up on your Chevy instrument cluster.