![]() Many times a fault in a different component or part can make a sensor look bad. Just remember that even if your computer points to a possible bad sensor, make sure to test the sensor before replacing it. And many other emission related sensors the computer rely on can fail as well, causing a CEL to come on. ![]() Usually, a bad MAF sensor will trigger the Check Engine Light (CEL). If a sensor fails to send the correct signal, the computer may deliver too little fuel, creating a lean fuel condition. ![]() The engine computer uses this and other sensors to compute the amount of fuel to inject into the engine according to operating conditions. Take for example a bad mass air flow (MAF) sensor. Engine Sensor ProblemsĪn engine sensor malfunction can also lead to backfires. Photo courtesy of Gill Sensors on Wikimedia III. When all else is eliminated that leaves you with a faulty ECM.Check your MAF sensor for dirt and operation. If that's not the case, it will require further testing for shorts, poor connections or open circuits. ![]() If disconnecting the sensor brings the voltage up to 5-volts, this officially condemns the Throttle Position Sensor. If the low voltage problem which set the code 22 is a hard failure and still present, you will see a reading below. 5-volts at idle to about 5-volts at WOT (wide-open throttle). When observing normal TPS voltage on a Scan Tool, the readings will vary from about. You could just cross your fingers and buy a Throttle Position Sensor, or you could have a qualified technician hook up a Scan Tool and diagnose the problem accurately in a couple of minutes. They consist of a 5-volt reference, a ground and a signal circuit all wired from the TPS directly to the ECM (Electronic Control Module). It's usually not that easy, but the Throttle Position Sensor circuits on your Chevy truck are very basic. ![]() It would make things really simple if a quick part swap cured every computer-related problem. The sensor itself may or may not be the fix. ![]()
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