After the car was repaired, the fault recurred again, which is a problem we often encounter in maintenance; When dealing with such problems, we should jump out of the fault phenomenon and analyze the root cause of the fault. This issue of small rail will bring you such a fault case and diagnosis case.
As for the trouble of engine starting, our diagnosis direction is as follows:
case analysis of diagnosis
How is the voltage fluctuation of T15 harness generated?
Can you see the voltage change from T15 data stream?
In case of failure of rail pressure control unit, such as rail pressure sensor failure, a safe alternative value is given according to the characteristics of oil pump in order to ensure “slope home”.