2004 BMW X5 camshaft sensor

TABLE OF CONTENTS
SubjectPage
M62TU Engine . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2
Vanos Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
Engine Cooling System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
IHKA System Auxilary Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DME-ME 7.2 Engine Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
IPO ME 7.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Integral Electronic Throttle System (EML). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Input Signal/Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Camshaft Position Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Hot Film Air Mass Sensor (HFM 5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Integrated Ambient Barometeric Pressure Sensor. . . . . . . . . . . . . . . . . . .21
Radiator Outlet Temperature Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
DSC III Road Speed Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Accelerator Pedal Sensor (PWG). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
EDK Throttle Position Feedback Signal. . . . . . . . . . . . . . . . . . . . . . . . . . 24
MFL Cruise Control Data Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Brake Light Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Can Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Output Control Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .27
E-Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Secondary Air Injection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Auxiliary Fan Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Electric Throttle Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
DM-TL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 31
Leak Diagnosis Test Precondition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

VANOS TRANSMISSION:The primary and secondary timing chain sprockets are inte-
grated with the VANOS transmission. The transmission is a self contained unit.
The controlled adjustment of the
camshaft occurs inside the “transmis-
sion”. Similar in principle to the six
cylinder engine VANOS systems, con-
trolled oil pressure moves the piston
axially.
The helical gear cut of the piston acts
on the helical gears on the inside sur-
face of the transmission and rotates
the camshaft to the specific advanced
or retarded angle position.
Three electrical pin contacts are locat-
ed on the front surface to verify the
default maximum retard position using
an ohmmeter. This is required during
assembly and adjustment. (see service
notes further on).
OIL DISTRIBUTION FLANGES:The oil distribution flanges are bolted to the front surface
of each cylinder head. They provide a mounting location for the VANOS solenoids as well
as the advance-retard oil ports from the solenoids to the intake camshafts.
CAMSHAFTS: Each intake camshaft has
two oil ports separated by three sealing rings
on their forward ends.
The ports direct pressurized oil from the oil
distribution flange to the inner workings of
the VANOS transmission.
Each camshaft has REVERSEthreaded
bores in their centers for the attachment of
the timing chain sprockets on the exhaust
cams and the VANOS transmissions for
each intake camshaft as shown.
CAMSHAFT POSITION IMPULSE WHEELS:The camshaft position impulse wheels pro-
vide camshaft position status to the engine control module via the camshaft position sen-
sors. The asymmetrical placement of the sensor wheel pulse plates provides the engine
control module with cylinder specific position ID in conjunction with crankshaft position.

12
VANOS SOLENOID REPLACEMENT
Refer to TIS repair manual section for com-
plete solenoid replacement procedures.
The solenoids are threaded into the oil distri-
bution flanges through a small opening in the
upper timing case covers.
Special Tool 11 6 420 is required.
VANOS TRANSMISSION RETARD POSI-
TION SET UP TOOLS
Special Tool 11 6 440 is used to rotate the
transmission to the full retard position when
checking the piston position with an ohmme-
ter.
This tool engages the inner hub of the trans-
mission provides an easy method of twisting
it to the left for the ohmmeter test.
Refer to SI Bulletin 04 12 98 for additional
special tool information.
DIAGNOSIS
The VANOS is fully compatible with the diagnostic software providing specific fault codes
and test modules. Additionally, diagnostic requests section provides status of the PWM of
the VANOS solenoids and camshaft position feedback via the camshaft position sensors.
The Service Functions section of the DIS/MoDiC also provides a VANOS system test.
11 6 440
11 6 420

15
DME-ME 7.2 ENGINE MANAGEMENT SYSTEM
The “ME” designation identifies the system as “M” = Motronic, “E” = EML.
• Manufactured by Bosch to BMW specifica-
tions
• 134 pin SKE (standard shell construction) con-
trol module located in E box
• Diagnostic communication protocol-KWP2000
• Uses break-out box set (P/N 90 88 6 121 300)
• Integral EML throttle control system
- monitors an interior installed PWG
- actuates an electric throttle valve (EDK)
• Integral Cruise control functionality
- monitors cruise control requests
- monitors brake pedal and clutch switches
- carries out throttle control directly via EDK
• Carries out DSC III torque reduction requests.
• VANOS control
• Integrated altitude sensor
• Integrated temp sensor for monitoring E box
temperatures
• Control of E-box fan
• One touch engine start control
• Oxygen Sensor heating
• Engine overrev & Max speed limitation
• Active Hall sensor for camshaft position monitoring
• Single speed secondary air injection system
• Electrically heated coolant system thermostat
• Longlife spark plugs
• IHKA Auxiliary Fan control
•DM-TL (Diagnostic Module - Tank Leak Diagnosis System)
ME 7.2 LOCATION IN E-BOX
1
(9 pins)2
(24 pins)3
(52 pins)4
(40 pins)5
(9 pins)

19
INPUT SIGNALS/COMPONENTS
CAMSHAFT POSITION SENSORS
Located on the upper timing case covers, the camshaft position sensors monitor the posi-
tion of the camshafts to establish start of ignition firing order, set up sequential fuel injection
triggering and for accurate camshaft advance-retard (VANOS) timing feedback.
Each intake camshaft’s advance-retard angles are adjusted simultaneously yet indepen-
dently. For this reason ME 7.2 requires a camshaft position sensor on each cy linder bank
for accurate feedback to monitor the VANOS controlled camshaft positioning.
The sensors are provided with operating power from the ECM main relay. The sensors pro-
duce a unique asymmetrical square-wave signal representative of the impulse wheel shape.
The sensors are new in the fact that they are “active” hall effect sensors. Active hall sen-
sors provide:
• low signal when a tooth of the camshaft impulse wheel is located in front of the sensor
• high signal when an air gap is present.
The active hall sensors supply a signal representative of camshaft position even before the
engine is running. The ME 7.2 determines an approximate location of the camshafts posi-
tions prior to engine start up optimizing cold start injection (reduced emissions.)
UNIQUE SIGNAL
AS SEEN IN
MEASUREMENT
SYSTEM
OSCILLOSCOPE