BMW 3 (E46). Manual — part 64
positions.
The Double VANOS system allows full
variability of camshaft timing up to the
limits of the system. When the ECM
detects that the camshafts are in
optimum position, the solenoids are
modulated at approximately 100 - 220
Hz to maintain oil pressure on both
sides of the actuator pistons to
maintain timing.
In models with DME MS 43.0 (model
year 2001), the engine control module
(ECM) detects camshaft position before
the engine starts, thereby adjusting
camshaft timing immediately upon
start-up
Note:
BMW does not provide diagnostic
information or specifications for
the Double VANOS system.
VANOS system troubleshooting
and diagnostics is best
accomplished using a scan tool.
Diagnostic Trouble Codes (DTCs)
pertaining to the VANOS system
are listed in
Table a
. See also
OBD On Board Diagnostics
at
the back of this manual.
Elevated oil temperatures can
cause VANOS to deactivate. Oil
that is too thick (high viscosity)
may cause a DTC to be set in the
ECM. If VANOS is deactivated
(limp-home mode), there will be a
noticeable loss of power.
Table a. VANOS fault codes
BMW
code
P-code
Fault
description
Table a. VANOS fault codes
BMW
code
P-code
Fault
description
19
P1529
VANOS
solenoid valve
activation,
exhaust
21
P1525
VANOS
solenoid valve
activation,
intake
103
P1519
VANOS faulty
reference value
intake
104
P1520
VANOS faulty
reference value
exhaust
105
P1522
VANOS stuck
(Bank 1) intake
106
P1523
VANOS stuck
(Bank 2)
exhaust
Double VANOS components
VANOS control unit
1
-
Bolt M6
2
-
Exhaust
camshaft
position sensor
3
-
Sealing ring
4
-
Camshaft end
sealing plug
tighten to 50
Nm (37 ft-lb)
5
-
Camshaft seal
cap
6
-
VANOS
hydraulic piston
set screw
CAUTION:
left hand
thread
tighten to 10
Nm (89 in-lb)
7
-
Nut M7
tighten to 14
Nm (10 ft-lb)
8
-
Engine lifting
hook
9
-
Stud M7
10
-
Nut M6
tighten to 10
Nm (89 in-lb)
11
-
Gasket
12
-
Cylinder head
13
-
Sealing ring
14
-
Intake camshaft
sensor
15
-
Bolt M6
16
-
VANOS control
unit
17
-
Copper sealing
ring
18
-
VANOS oil feed
line
19
-
Banjo bolt
tighten to 32
Nm (24 ft-lb)
VANOS control unit, removing
Note:
If the Double VANOS control unit is
being replaced, camshaft timing must be
checked as described later in this group.
This procedure requires multiple special
tools. Be sure to read the procedures
through before beginning the repair.
-
Working inside trunk, disconnect
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