Starter; Starter Troubleshooting - BMW 5251 Service Manual

Battery, Starter, Alternator
-
Installation is reverse of removal, noting the following:
Replace alternator rubber sealing O-ring.
*
Fill and bleed cooling system as described in 170 Radiator
and Cooling System.
Tightening torques
Fan clutch to coolant pump
with BMW special tool 11
5
040 30 Nm
(22
ft-lb)
without BMW special tool
11 5
040 40 Nm
(29
ft-lb)
Terminal 30
(Bc)
wire to alternator (ME) 13 Nm (10 ft-lb)
STARTER
Starter troubleshooting
Typical starter wiring terminal identification is shown. Large
wire at terminal 30 (not shown in photo) is direct battery volt-
age. Smaller wire at terminal 50 operates starter solenoid via
ignition switch.
If starter turns engine slowly when ignition is in start position:
Check battery state of charge.
Inspect starter wires, terminals, and ground connectlons
for good contact. In particular, make sure ground connec-
tions between battery, body and englne are completely
clean and tight.
If no faults are found, starter may be faulty and should be
replaced.
-
If starter fails to operate, check EWS (drive-away protection
system). Try another ignition key. If no faults can be found,
have the EWS system checked using BMW scan tool equip-
ment.
Checkclutch pedal operated starter lock-out switch or gear
position switch (automatic).
NOTE-
*
A factory-installed drive-away protection system, also re-
ferred to as EWS, is used on E39 cars. This system pre-
vents operation of the starter if a specially coded ignition
key is not used.
On cars with automatic transmission, the transmission
gear position switch signals EWS to prevent the engine
from starting in gear positions other than PARK or NEU-
TRAL.
On cars with manual transmissions, a starter immobiliza-
tion switch at the clutch pedal is used to prevent the starter
from operating unless the clutch pedal is pushed fully to
the floor.