eobdTOOL

A BMW 3 Series sedan, chassis F35, equipped with N20 engine and ZF8HP automatic transmission, running in the MB SD C4instrument on the transmission oil temperature is too high alarm light, and the existence of the engine flame out of the symptoms, the customer into the factory required CGDI Prog Benz maintenance.

    According to the fault code, the maintenance personnel run the test plan ABL program, but did not get any results, only "delete the fault code memory", "in this involves a false fault, the pseudo fault occurs after the vehicle programming" and so on prompt. In other words: According to the CGDI Prog MB diagnostic software test plan description, overheating alarm fault code is false, may appear after programming, please delete the fault code.

As a result, the maintenance personnel to remove the fault code again test, the results found that the transmission overheating alarm still appears. At the same time maintenance personnel can be sure that the information is: the transmission overheating alarm, the Launch X431 V tablet scanner transmission temperature is definitely not high, the vehicle stopped in the factory after 4h on the road, just driving 3min system began to alarm, so maintenance personnel suspected to be procedural issues , Resulting in the transmission oil temperature error alarm, but after the X431 V vehicle re-test the program, the fault still exists.

 

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    First of all, from the fault code to freeze the data point of view, maintenance personnel to judge is not wrong, 0001 group transmission oil temperature 33 ℃, is indeed the transmission in the preheating stage of the oil temperature.

    Second, the data clearly recorded: 0024 group of the transmission temperature of 200 ℃, the temperature alarm threshold or 145 ℃, it must be false alarm, but the Xtool x100 pad temperature is where the 200 ℃?

    In addition, we can see from the data we can see the state of the vehicle: gear 2 block, engine torque 56N · M, throttle opening 0, transmission module EGS chip temperature 31 ℃.

    People feel more strange is: transmission module EGS system sensor supply voltage is 8.9V, is normal, and the system voltage was 11.44V, is the system voltage is a problem? And at this time the engine speed up to 4 096r / min ah!

After the xtool x100 pad tablet key programmer communication was informed that the transmission oil temperature overheating alarm failure, the engine immediately turn off, speed 20km / h or so, although not notice the engine before the turnout, but certainly not to 4 096r / min. Engine stalled This clue is novel! The only way the CGDI MB automatic transmission can knock off the engine is that only the torque converter is stuck, but the probability is very small. Then in turn think: why the transmission of false oil temperature is high, this is not caused by the engine flameout?

http://www.bmw-icom.org/ you could find some BMW info