BMW E60 M57 diesel: injectors and correction values
What does fault code 4B10 mean on the E60 M57?
Code 4B10 indicates that the correction value of one of the injectors is too large. Symptoms are a rough idle and loud running when cold. The glow plugs and glow plug controller should be checked before servicing the injectors, as a glow plug fault can exist without its own fault code.
How are the injector correction values monitored?
The correction values are read with a diagnostic tool at idle and at about 2500 rpm. At higher revs no correction is made any more. A single deviating injector stands out from the others with a larger value.
How is injector leak-off measured?
The correction values do not show leak-off. It is seen by connecting to each injector's return line a piece of 8 mm clear hose about half a metre long, with a short 3.2 mm rubber hose between as an adapter. The hoses are fixed pointing upwards, the engine is cranked and you watch which injector leaks.