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Posted on Jan 02, 2017
Why my Check Engine light comes on?
The engine computer or PCM/ECM
All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.
Posted on Oct 06, 2009
SOURCE: brake switch fuse keeps blowing
I Have the same problem with my 97 ford keeps blown fuse 15 amp,when I step on the brake pedal,to shift out of park it blows the fuse.can someone help me out what to look for.I replaced the switch on brake pedal that wasn't it.
Posted on Nov 07, 2009
SOURCE: my jeep wrangler 2008 has
Welcome to the world of modern technology, where the vehicle manufacturers are having a race to see who can do the best job of keeping a vehicle owner from diagnosing something as simple as a light circuit! In an attempt to FORCE them into the dealership repair shops. Please check out this web site: Right To Repair
Okay - Here's how the manufacturer has succeeded in deterring any DIY attempt to repair your park lamp circuits:
The light switch does not actually switch the lights on or off. The light switch is actually a small computer that sends a digital signal to the Body Control Module (BCM) to tell it that you are "requesting" that the lights be turned on.
The BCM (if it decides to comply) then sends a digital signal to the Totally Integrated Power Module (TIPM) This is the thing under the hood that most people would call a "fuse box", however, it also contains a small computer. Fuses M17 and M18 in the TIPM are what provide power (protect the circuits) for your park lamps (both are 15 Amp fuses). I am assuming that these are the fuses that you checked. Please note that these fuses are "switched". They only have power when the power is turned on by the TIPM, and this only happens when the BCM tells the TIPM to do so.
If you are checking the fuses with the ignition switch in the RUN position and the headlamp switch in the PARK or HEADLAMP position and there is no power at these fuses, you will have to use a scanner that can read the data from the BCM to find out why.
If your headlamps are working, I would say that he problem is not a data communications problem between the headlamp switch and the BCM or between the BCM and the TIPM. It will most likely end with replacement of the TIPM, but then, the data really needs to be checked before replacing ANYTHING.
Posted on May 25, 2011
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