BMW 535i cold start difficult maintenance car

A driving range of about 90,000 km, the model F10, equipped with N55 engine, the 2013 BMW 535i sedan. Users reflect: the car cold start difficult, vehicle cardiagtool driving DSC, engine and clutch temperature at the same time alarm, manual shift mode can not be used.

Inspection and Analysis: Maintenance personnel testing the engine control unit and found the fault code 1 C3101 - Engine oil pressure sensor signal is not credible, before the start of the oil pressure is too high; 218404 - start the transformer / starter control circuit failure; 160001-crankshaft position carkeydeals sensor Signal missing; 120408 - Pressurization disabled; 4209A4 - Transmission fluid temperature sensor identifies overheating and possible damage to cooling lines.

Fault code and more, and it seems very complicated, in line with the principle of shallow, decided to begin with the crankshaft position sensor check. Moreover, many fault codes are likely to be associated with crankshaft crankshaft sensor failure. In order to save time decided to use analog fault diagnosis. Find a normal model of the same car, the crankshaft position  sensor disconnected, and then start and found the vvdi key tool v2.3.9 fault phenomenon and fault code exactly the same as the faulty car, which initially identified the problem is the crankshaft position sensor.

In order to further confirm the fault, the cold crank started measuring the signal waveform of the crankshaft position sensor and found that the signal was very weak. However, the signal of the normal car was not only strong but also stable. At this point can be very sure that the crankshaft position sensor problem.

Troubleshooting: After replacing the crankshaft position sensor test, the phenomenon disappears completely.

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