2002 BMW 745i ESP

Downloaded from www.Manualslib.com manuals search engine The ECM takes on the following functions:
• Activation/deactivation of the alternator.
• Informing the alternator regulator of the nominal voltage value to be set.
• Controlling the alternator's response to load.
• Diagnosing the data line between the alternator and the ECM.
• Storing alternator fault codes.
• Activating the charge indicator lamp in the instrument cluster.
The connection with the ECM makes it possible to equalize the alternator load torque for
nearly all operating conditions. This supports the engine idling speed control and the bat-
tery load balance. In addition, the ECM receives information from the Power Module about
the battery's calculated temperature and charge status. This means that alternator output
can be adapted precisely to the temperature and load status of the battery which increas-
es the battery service life.
The charge indicator display strategy has not changed in comparison with the alternators
currently in use. Regulating the alternator output is particularly important when activating
Valvetronic operating motors.
A temperature protection function is implemented in the voltage regulator. If the alternator
overheats, the alternator voltage is reduced until an appropriate temperature has been
reached.
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• Electrical faults such as exciter diode defects or over/under voltage caused by regula-
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• Connection defects between the ECM and the alternator.
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18
N62 Engine

Downloaded from www.Manualslib.com manuals search engine 29
N62 Engine
Bi-VANOS (Variable Camshaft Adjustment)
The N62 features compact infinitely variable vane-type VANOS for the intake and exhaust
camshafts. The VANOS unit is easy to remove and install. The VANOS unit is designed as
an integral component of the chain drive and is secured to the respective camshaft with a
central bolt. The camshaft adjustment rate is 60º (as compared with the crankshaft).
The VANOS unit gear teeth are visibly different to match the new toothed chain. The
VANOS unit for the cylinders 1-4 exhaust shaft has mounting provisions for the vacuum
pump drive. A spring plate is fitted between the VANOS unit and the vacuum pump drive
to reduce wear (3). The V VA
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tion positions.
The VANOS units are supplied with oil via ports in the camshafts. The oil ports are located
on the left and right of the thrust bearing. Depending on the individual VANOS adjustment
direction, the VANOS is supplied with oil via either the rear oil ports (1 & 2) or the front oil
ports (3 & 4). The oil moves through the camshaft to the VANOS units.
VANOS Units
1. VANOS Unit Exhaust Side
2. VANOS Central Bolt
3. Spring Plate
4. VANOS Unit Intake Side
5. Toothed Chain Gear Teeth
VANOS Oil Ports
1&2. Rear Oil Duct with Four Holes
3&4. Front Oil Duct with Four Holes
5. Front Oil Duct Outlets
6&7. Hook Sealing Washer.43-02-39

Downloaded from www.Manualslib.com manuals search engine 42
N62 Engine
Map-controlled Thermostat
The map-controlled thermostat allows the engine to be cooled relevant to operating con-
ditions. This reduces fuel consumption by approximately 1-6%. The electrical connections,
the design and the map-controlled thermostat response have been enhanced. The map-
controlled thermostat function is the same as previous engines (M62).
Cooling Module
The cooling module contains the following main cooling system components:
• Cooling radiator
• Air conditioning condenser
• Transmission oil/water heat exchanger
• Hydraulic fluid radiator
• Engine oil radiator
• Main electric fan
• Fan shroud for viscous coupling fan
All the components (with the exception of the transmission oil radiator) can be removed for
repairs without disassembling any other coolant circuit. All connections have been fitted
with the quick-release coupling which are used in current models.
Maped-Controlled Thermostat
1. Radiator Return Flow To Thermostat
2. Connection for Thermostat Heating Element
3. Temperature Sensor
4. Radiator in-flow (hot coolant from engine)