BMW 5251 Service Manual page 70

100-4
I
Engine-General
The M62 90" V8 engine uses four valves per cylinder, double
overhead camshafts and light alloy cylinder head and cylin-
der bloclc engine construction.
On 1997 and 1998 540i models, Bosch engine management
systems are utilized. Table a lists engine management sys-
tem applications.
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For the 1999 model year, the M62 TU VANOS engine was in-
troduced to the 540i models. This engine is primarily a carry-
over from the earlier M62 engine, but contains many unique
identifying components and technology:
Variable camshaft timing (VANOS) for the intake valves.
Bosch ME 7.2 engine management system with electronic
throttle control. There is no accelerator cable connecting
the throttle pedal to the throttle housing in these cars.
Compact water-cooled generator (alternator).
E39 vehicles are equipped with sophisticated self-diagnostic
engine management systems. These systems monitor and
store diagnostic fault information. If the malfunction indicator
lamp (MIL) illuminates, the first diagnostic test should be to
connect a dedicated scan tool for BMW automobiles and in-
terrogate the fault memory.
If the malfunction indicator light (MIL) comes on orflashes, it
indicates that an emissions-related fault has occurred and
that fault information is stored in memory within the ECM.
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The MIL in E39 cars displays one of these warning graphics
in the instrument cluster.
The diagnostic capabilities of these systems have the poten-
tial to save hours of diagnostic time and prevent incorrect
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placement. See OBD On-Board Diagnostics.