287 HO 03 M272 (FAH) 08-05-04 - Bill's Den: Home

O2 Sensor

Networking

17 – Fuel rail
158 – Catalytic converter
B2/5 – Hot film mass airflow sensor
B11/4 – Coolant temperature sensor
B70 – Crankshaft hall sensor
B37 – Accelerator pedal sensor
G3/3 – Left upstream O2 sensor
G3/5 – Left downstream O2 sensor
G3/4 – Right upstream O2 sensor
G3/6 – Right downstream O2 sensor
N3/10 – ME 9.7
Y62 – Fuel injectors

51

Ignitio

• Individual coil on plug
• Driver located inside coil not in M
• Each coil controlled separately
• Diagnostic information sent bac
• Bi-directional communication wi

on Coil

ME 9.7

ck to ME
ith ME

Pin 1 – batt
Pin 2 – ground
Pin 3 – ground
Pin 4 – control/diagnosis

52

Ignition N

A16/1 – Right knock sensor
A16/2 – Left knock sensor
B6/4 – Left intake camshaft hall sensor
B6/5 – Right intake camshaft hall sensor
B6/6 – Left exhaust camshaft hall sensor
B6/7 – Right exhaust camshaft hall sensor
B2/5 – Hot film mass airflow sensor
B11/4 – Coolant temperature sensor
B70 – Crankshaft hall sensor

Networking

B37 – Accelerator pedal sensor
M16/6 – Throttle valve actuator
N3/10 – ME 9.7
N47-5 – ESP and BAS control unit
T1/1 through T1/6 – ignition coil for cylinders 1 to 6
Y3/8n4 - Fully integrated transmission
control (VGS) control unit
X11/4 – Data link connector

53

Hot Film Mass

• Frequency signal from Mass Airflow
to ME

• Integrated Intake air temperature
sensor used

Airflow Sensor

54

Temperature m
Thermo
Contr

management
ostat
rol

55

Temperature

• Coolant Temperature is regulated
via Me 9.7

• 3 plate thermostat

• Regulates temperature from 185°F
to 221°F (85°C to 105°C)

• Heating element in thermostat energiz
to heat thermostat

• 4 operating modes dependent on engi
temperature and load

Management

zed
ine

56

Temperature

1 – To radiator A – Stationary cool
2 – From engine B – Circuit for engi
3 – To engine C – Active after 20

temp. above 8
D – Position for ma

Management

lant (cold start)
ine and heat exchanger
08°F (98°C), after start or ambient
82°F (28°C)
ax radiator operation

57

Temperature

Management

58

Fuel ta
Fuel pump

ank
p control

59

Fuel

• Magnesium cover helps protect tank
• Two layer steel tank with 18.4

gallon capacity
• In tank fuel supply system operates

with 3.8 bar pressure
• Fuel filter with pressure regulator
• Returnless fuel system

Tank

60

Fuel Net

A Electrical line
B Fuel pipe
C Purge line

12 Intake manifold 75 Fuel ta
17 Fuel rail 76 Vent v
17/1 Fuel pressure USA
reservoir 77 Activa
45 Fuel filler neck, canister
with ORVR B4/3 Fue
51 Pressure gauge sensor
connection M3 Fuel p
55/2 Fuel filter (with inte
55/2a Fuel pressure (FP))
regulator 3.8 bar

tworking

ank N10/2kA Fuel pump
valve, except relay
N3/10 ME-SFI
ated charcoal control unit
Y58/1 Purge control
el tank pressure valve
Y58/4 Activated
pump assembly charcoal filter shutoff
egral fuel pump valve
Y62 Fuel injection
valves 61

Fuel Pum

• Fuel pump controlled via fuel pump
relay (N10/2kA)

• Fuel pump Relay located in rear
SAM (N10/2)

• Fuel pump relay energized via ME
• Fuel pump runs ~ 1 second after

ignition on

mp Control

N10/2 – Rear SAM
N10/2kA – Fuel pump relay

62

Fuel Supply C

P
Fuel
Filter

Return
Splash bowl

Fuel supply to eng

Circuit In Tank

Pressure Regulator (3.8 bar)
Supply

Fuel
Pump

gine

63

Access Point To Fu

uel Filter and Pump

Tank
Pressure
Sensor

Connector
For pump
And level
sensor

64

Fuel Pressur

AB

re Regulator

Filter

Pressure
regulator
C

A-from pump
B-return to

splash bowl
C-filtered fuel

to engine

65

Fuel Leve

Release tangs

el Sensor

s for removal

66

Splash

h Bowl

pump

Swivel
2 retainers
to remove
pump

67

Fuel P

Pump

68

N3/10 – ME 9.7
A1 – Instrument cluster
N10/2 – Rear SAM

B4 – Fuel level sensor
75 – Fuel tank

69

Speed Sensitive

e Power Steering

70

Speed Sensitive

• Gives the customer firmer feel
more assist for parking maneu

• ME 9.7 now controls functions
Steering system

• The valve port is adjusted for s
current driving condition and is
signals:
– Engine speed
– Vehicle speed (Via CAN)
– Steering angle (Via CAN)
– Steering angle speed (Via C

e Power Steering

in steering at higher speeds and
uvers at slower speeds

of the Speed Sensitive Power
steering support required for the
s dependent on the following input

CAN)

71

Speed Sensitive

• The pressure regulator valve c
rigidly connected to the power

• It is actuated according to a pe
of 10 to 90% and regulates the
steering pump at between 2 an

• The pressure regulator valve is
during engine start

• In the case of faults on the inpu
regulator valve, actuation is int
maximum support is available f

e Power Steering

controls the valve port and is
steering pump

erformance map with a duty cycle
e amount delivered to the power
nd 9 liters/minute

s opened wide for ignition ON and

ut signals or on the pressure
terrupted immediately and the
from the power steering pump

72

Speed Sensitive
Netwo

B70 Crankshaft Hall sensor
N3/10 ME-SFI control unit
N47-5 ESP and BAS contro
N80 Steering column modu
Y10/1 Power steering pump

e Power Steering
orking

r 73

ol unit
ule
p pressure regulator valve



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