Remember that there was a Launch X431 V 8 inch diagnosis maintenance communication, for the new Excelle, if reported the fault code, you can through online programming, Launch ECM upgrade to solve this problem. Is the old Excelle also have this fault? With this question, try to program the car, then let the customer try a few days to see.
The results of a week after the customer once again to say that failure has not been resolved. Launch X431 V full system diagnostic found that the last fault code, which further verify the last speculation: the problem is out of the pressure in this component.
So what exactly is the sensor itself or the ECM or its related lines? With this question, try to exchange with the normal vehicle ECM, with caution, after ECM, the way the ECM plug and check it again, open the plug on the back of the cover, suddenly found that there are a lot of water vapor, thinking that the problem Here, there is water vapor that will definitely cause the associated signal to fail.
Which know after dealing with Launch X431 V Bluetooth water vapor after the test, just a road failure appeared. Step down the throttle normal acceleration, suddenly feel the car does not go, and the engine has to turn off the feeling, the speed fluctuated, the more the throttle, the vehicle more and more, and Launch X431 V diagnostic accompanied by a towering vehicle, which lasted about 5 Second, the fault disappears and the vehicle returns to normal.
Fortunately, early preparation, we use Launch X431 Full system to capture the failure of the intake pressure sensor value, then deliberately lost throttle and found that the intake manifold pressure even reached 94kPa, which is clearly not (normal 30kPa), the value of the corresponding engine workers The situation should be when the X431 close to full open time. There is also this time on the 1st oxygen sensor is not right, its signal is 900mv fixed, short-term fuel adjustment is not, for -25%, the two data show that the mixture was too thick. Since the line has been processed, ECM also changed, and only suspected intake pressure sensor.
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Try to exchange Launch X431 V wifi with the normal vehicle intake pressure sensor, so that customers try, the results of the other car did not appear a few days the same failure. At this point, it can be sure that the fault point in the intake pressure sensor, as shown, it intermittent poor work, to provide false signal ECM, resulting in fuel supply and engine conditions do not meet, resulting in acceleration failure symptoms.
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