Quote:
Originally Posted by speeddemon
Weirdest thing happened yesterday. I pull over to the side of the road (actually to check on a stray dog that looked like he had a broken leg), and I turn the key off. I get out of the car and it sounds like its still running....and it is! I take the key totally out of the ignition and it is STILL RUNNING. The digitial odometer and MPH go blank and I can still drive the car without the key in the igninition. I start driving and the engine light comes on.. I plug in my scanner and it says "lost communication with vehicle dynamics". I erased the code and then it felt like the throttle as a "dead spot" when pulling out - similar to when I first flashed OFT and car was learning. I thought maybe plugging it it messed with my tune so I reflashed to Stage 2 UEL. Maybe it needs to relearn.... Anyone else have anything like this happen?
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Hard to work out what going on but
1. Tune is written to ecu flash memory and is not erased or altered if battery flattened or ecu reset or anything else. Then only way to alter or erase a "tune" is to flash in a new one.
2. You will get error codes sometimes if you plug/unplug devices including the OFT, Bluetooth adapters etc. into the cars OBD port (or the cable falls out or is loose or your obd port is worn). This is because the obd port is on the CAN buss which most of the cars control units including the ECU VSC Imobiliser and other units communicate on. Plugging/unplugging devices into the obd port while car is on can momentarily interrupt these communications causing weird stuff to happen and errors codes to be logged and sometimes cause ECU to go into limp home mode.
3. If you reflash or reset ecu with battery removal, or clear error codes with obd scanner this will effectively reset ecu and clear learned parameters such as knock correction table, learned fueling info, throttle and cam position sensor calibration ect, this may make the car feel sluggish or "different" for a few drive cycles. It does not however effect the "tune" stored in the flash memory, just erases the learned parameters in the RAM area of the ecu or other control modules.