- #Can pcmscan turn off my engine light code
- #Can pcmscan turn off my engine light professional
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This engine light is an important part of your vehicle’s on-board diagnostic system. There are countless reasons why the check engine light might pop on.
What Could Cause the Check Engine Light to Turn On?
#Can pcmscan turn off my engine light professional
In order to really know what it is wrong with your car, it’s best to have a professional diagnose the issue. And major problems, such as failed internal engine components, can turn on the light, as well. For example, something as simple as a loose gas cap can trigger the warning. The check engine light can come on for many reasons. The bad news is: The check engine light can mean there’s something horribly wrong with your car. The good news is: The check engine light doesn’t always mean something is horribly wrong with your car.
If you find yourself in this situation, we have both good news and bad news. It’s the check engine light – one of the most dreaded sights known to humankind. It looks like the outline of a car’s engine, and the words “check” or “check engine” might appear next to it. If the PCM finds an emissions-related failure in any powertrain system, it turns on the “check engine” light.You’re driving along, minding your own business, when out of nowhere, a light pops up in your dashboard.
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The PCM also begins running a series of tests on emissions system actuator components to see if they are working. At this point, the PCM turns on actuators like the ignition coils and fuel injectors to start the engine and begin operating in an open-loop mode.Īs soon as the oxygen sensors located in the exhaust system start producing a signal, the PCM switches into the closed-loop mode, which means that it is now adjusting fuel delivery, spark advance, and idle speed to meet various operating conditions. When the cranking speed exceeds approximately 200 rpm, the PCM re-activates the fuel pump to supply fuel to the engine. As the engine is cranked, the PCM receives a signal from the crankshaft position sensor indicating cranking speed. The PCM also activates the in-tank fuel pump for a few seconds during cranking to pressurize the fuel system. In some applications, critical data like barometric pressure or altitude might be stored in an adaptive memory built into the PCM so the engine will immediately start. When the ignition is turned on, the PCM uses ambient temperature, coolant temperature, and barometric pressure sensor inputs to determine the correct air/fuel mixture ratio for starting the engine.
#Can pcmscan turn off my engine light code
As with any computer, the PCM uses a binary code to execute complicated math formulas programmed into its read-only memory. In reality, an automotive computer or powertrain control module (PCM) is an information processor that turns electrical inputs from system sensors into electrical outputs into system actuators.
To many amateur mechanics, an automotive computer is a “black box” that mysteriously controls all of the engine functions. At that point, my jobber referred his customer and his problem to me. He then decides the fuel pump is defective and wants the jobber to warranty the fuel pump. His next step is to remove and inspect the new fuel pump. After replacing the battery, he still can’t get the Jeep to start. In frustration, he turns his commercial-grade battery charger on a high-boost charging setting with no result. So the contractor places the battery on a slow charge and returns at lunch time only to find that the battery is still dead. A few days after the fuel pump replacement, the wife discovered that her Jeep had a dead battery.