Question about 2006 Audi A3
Check gas cap first that its secure and sealing correctly if good trouble light can be 1 of about 100 different codes have car scanned most auto stores such as auto zone/advanced auto do this service for free the trouble code will give u your area or component problem so u can repair the problem
Posted on Jun 01, 2010
There are literally hundreds of possibilities as to why a check engine light(CEL)
comes on. The system would have to be scanned to retrieve whatever fail
codes there are. Then, we would use a manual (that is literally 3
inches thick)that contains flow charts with pinpoint tests, using a
voltmeter, to hand diagnose, and find out what is wrong. This process
can take a few minutes, it may take a couple of hours, depending on what
is actually wrong.
Now here is the "why" of a CEL: What is actually turning on the CEL is the Powertrain Control Module(PCM), commonly known as the engine control computer. Inside of a PCM there are actually two separate systems. One is control, the other system is diagnostics. PCM diagnostics acts as "big brother," constantly looking over the shoulder of the control side of the PCM. Diagnostics is constantly monitering systems to see if the expected voltages and values are present. For example: If the PCM diagnostics knows that it has been so many minutes since the engine was first started, then the engine temperature should be around 195 degrees. In our senerio, if the engine is still 160 degrees, it sees a problem, and sets the CEL. The technician has to use pinpoint diagnostics to see if we have a stuck thermostat, if the Engine Coolant Temp(ECT) sensor if sending a false signal, if the wiring between the ECT and the PCM is bad, or if the PCM is faulty and interpreting the signal recieved from the ECT incorrectly. But the PCM is not capable of monitering everything all at once, so it basically goes down a checklist, over and over again, as you are driving down the road. Sometimes a problem can come and go intermittantly, at the right times so as to avoid detection by the PCM. That is why sometimes a CEL dosen't always come on everytime there is a problem. Sometimes you can unplug a sensor even while the car is running, and it takes a while for the CEL to come on, just because the PCM diagnostics hasen't gotten back around to looking at that area yet.
Our senerio only talked about one area that a PCM moniters. There are dozens of sub-systems that the PCM looks at, and dozens of possible failures within each of those sub-systems, that could cause a CEL.
Posted on Jun 01, 2010
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Posted on Jan 02, 2017
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