We have all had our check engine light come on and think the worst. Well just because the light came on doesn’t mean there is a monumental disaster around the corner. In fact, most of the time, it is something small such as a faulty o2 sensor or your gas cap is on incorrectly. There are two different ways your check engine light warns you. First is a steady light; this indicates not an emergency, but still important enough to make an appointment. Second is flashing, this usually means there is a severe problem. If this happens, stop your vehicle immediately to avoid further damage. Don’t stress, you can find out exactly what is going on by using an (On Board Diagnostics) OBD2 Scanner, or you can go to your local auto repair shop. An Auto Scanner Diagnostic Tool can help you retrieve the error codes that trigger your check engine light. These codes are defined specifically and are either (generic) universal or manufacture specific and there are five digits. I will explain them briefly below. There are a handful of problems that are the usual suspects of the dreaded Check Engine Light. The first being your gas cap. If it is not properly attached it can cause your check engine light to illuminate. The second culprit is your O2 sensor. If the sensor is malfunctioning or broken, it can effect your emissions and reduce gas mileage. Third would be your Mass Air Flow sensor. This Professional Automotive Diagnostic Tool is responsible for supplying the right amount of air to your engine allowing for proper fuel distribution. Spark Plugs are also a common factor when your check engine lite is on. Your spark plugs ignite the compressed gas within your engine, when there is spark plug failure damage to the catalytic converter can happen. Additionally it can affect your engines overall performance and fuel economy. Your check engine light can alert you to more problems than I have discussed here. So if you are experiencing check engine light problems check get the codes from an OBD II Scanner Tool or visit your local auto repair shop to diagnose your vehicle’s trouble codes.
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Purpose: DIY – DME/ECU Read Write and Tuning 2016MY F82 M using KTAG KTM100 master clone ecu tuning tool. Disclaimer: Credit to su_root on bimmer forum provided the document for educational purposes. We are not responsible for any direct or indirect damage that may occur to your property as a result of the information provided here. Parts arrived this morning. Below are pictures of what was included in the box. Software setup: After making the changes above to my PC I powered up the adapter and plugged in the USB cable. Windows warned me of the unsigned driver and continued the install. Bringing up ECU Programming Tool KTM100 I see all is recognized correctly. You can also see below that the DME is supported and a plugin is available to communicate with that DME and calculate the correct checksum. Ready to start! On Sunday I was able to get the car on the dyno and grab some factory numbers. Phase 1 – Reading the DME: Here she is. Bosch MEVD172G DME. Below are a few pictures of the outside of the unit. I cleaned up a bit of sand around the unit to make sure nothing gets in while I attempt to open it up. After about 30 minutes with a small blade going around the edges of the unit I was able to open the casing up. Luckily the components are not close to the edge of the case so as you’re going around it with a blade you don’t have to worry too much. But as always be careful not to jam the blade too deep; you may accidentally damage some of the surface mounted components. Wired up the unit to the KTM100 clone using the PDF attachment I posted earlier. Reading procedure is as follows: 1. Connect wires from the provided harnesses to the DME pins as shown in the Bosch PDF including BOOT pin. Phase 2 – Tuning: You have two options: 1. Acquire and LEARN tuning software like WinOLS, ECM TITANIUM or similar, and spend time and resources on custom dyno tuning the car. 2. Take your dumped files and send them off to a tuner for tuning service. Most US tuners will flat out turn your business away. I wont call them out here but I would encourage you to contact them and listen to their response first hand. I installed the DME back into the car yesterday afternoon. It was pretty nerve wrecking to sit in the car and push the ‘Start’ button. I was very confident I followed all the right steps but there’s always that sense of uncertainty in the back of your mind. What if i damaged something? At that moment I didn’t care if the remaps actually yielded any results; I was just hoping the car would crank back up. I held my breath, pushed ‘Start’ and the car sprung back to life. It was such a sense of accomplishment. |
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