2001 BMW 525i Front

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I Fuel Injection
Table b. Siemens MS 41.1 ECM pin assignments (continued)
Pin
l~iqnal I Componentlfunction 1 Notes I - I I
5 loutput I Fuel injector control, cyl. 2 I Pulsed ground (pulse width in ms), cyl. 2 I I I
6 loutput /Fuel injector control, cyi. 1 I Pulsed ground (pulse width in ms), cyl. 1
I I I
14 linput I Intake air temp. sensor (IAT) I Intake air temperature signal
- 7
8
9
10
11
12
13
ground
input
output
input
input
15
16
17 18
19
20
21
22
I - I I
35 loutput /Secondary air injection ISecondary air inj. pump relay control
25
26
27
28
29
30
31
32
33
36
/output I Engine speed output IEngine speed signal
Mass air flow sensor
Mass air flow sensor
instrument cluster
Engine coolant
temp.
(ECT) sensor
Not used
Throttle position sensor (TPS)
Not used
input
input
input
input
output
output
out~ut
37 1 - /Not used I
Mass air flow sensor signal
Mass air flow sensor signal
Fuel consumption signal
ECT signal
Throttle position signal
ground
input
output
ground
output
output
output
ground
output
Traction control (rear engine speed signal) Automatic climate control
Not used Electronic immobilizer control (EWS)
Auto. climate control
(AIC on input)
instrument
cluster
Camshaft actuator control (VANOS)
Fuel iniector control, cvl.
3
AES/ASC module
Automatic climate control instrument cluster (CARE signal)
Camshaft actuator (VANOS), switched ground
Pulsed ground (pulse width in
ms), cyl. 3
Oxygen sensor heater (no. 1 in front of catalytic
converter)
Power supply (terminal
30)
Idle speed control valve
Ground
Ignition coil control, cyl.
1
Ignition coil control, cyl. 3
Ignition coil control, cyl. 5
Ground Fuel injector control, cyl.
5
Oxygen sensor heater ground
Battery voltage
(E+) at all times
Pulsed ground-open signal (See pin
53)
Ground
Primary signal, ignition coil
1
Primary signal, ignition coil 3
Primary signal, ignition coil 5
Ground
Pulsed ground (pulse width in ms), cyl
5

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Fuel lniection 1
Table b. Siemens MS 41.1 ECM pin assignments (continued)
Pin
lSiqnal 1 Componentlfunction / Notes I - I I
40 1 ground /Crankshaft position sensor /crankshaft position sensor control I - I I
41 1 ground /Camshaft position sensor (CMP) /shielding for CMP sensor I - I I
42 1 ground I~hrottie position sensor (TPS) /TPS ground
43
44
45
46
47
48
49
50
51 ground
output
output
output
outout
I I I
input
52 53
54
55
56 57
58
59
60
61
62
63
64
65
66 Camshaft position sensor (CMP)
Throttle position sensor (TPS)
Throttle position sensor (traction control)
Instrument cluster
Not used
Crankshaft position sensor (Hall effect)
I~ot used
I I I
Fuel pump relay control Camshaft
positionlrpm sensor control
Voltage
supply to TPS (5 vdc)
ABSIASC module
Instrument cluster, fuel reserve signal
Crankshaft position sensor control
Power supply (terminal 15)
Not used
Not used
output input
ground
ground
output
input
output
inputloutput
ground
output
input
input
input
I I
Battery voltage with key on or engine running
Oxygen sensor signal ground
67
Idle speed control valve
Power supply
Oxygen sensor heater (no. 2 in front catalytic
converter)
Ignition circuit
Knock sensor
(cyl. 1-3)
Knock sensor (cyl. 1-3)
Knock sensor
(cyl4-6)
Data linic connector (TxD)
Oxygen sensor heater (no. 2 behind catalytic
converter)
Secondary air injection
Knock sensor (cyl. 4-6)
Camshaft
positionlrpm sensor
Camshaft
positionlrpm sensor
Not used
Pulse ground with engine at normal temperature with
varying engine load
68 Pulsed ground-close signal (see
pin 26)
Battery voltage from main relay (terminal 87)
Oxygen sensor heater ground
Ignition circuit monitoring signal
Knock sensor
Knock sensor signal
Knock sensor
Diagnostic
TxD (transmit) signal to pin 18 in data link
connector
Oxygen sensor heater ground
Secondary air injection control
valve
Knocic sensor signal
Camshaft positionlrpm sensor control
Camshaft
positionlrpm sensor control
ground Oxygen sensor
(no.
1 in front of catalytic
converter)
output Evaporative purge
valve control

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. .
Fuel Injection
Check resistance of valve across valve terminals
Idle speed control valve coil resistance
Terminals
1 and 2 20 i2.0.
Terminals 2 and 3 20 i2.0.
Terminals 1 and 3 40 i4.0.
CAUTIOIG
Be sure ignition is OFFbefore disconnecting or reconnecting
DME system components.
- To remove valve, remove cable bracket mounting bolt and
idle speed control valve mounting bracket bolts from front of
throttle housing and remove idle speed control valve with at-
tached bracket.
NOTE-
When installing idle speed control valve, remove intake boot
sealing ring from valve and install into intake air boot. Then
install valve info sealing
ring.
Evaporative emissions control diagrams
MS 42.0 (LDP) ,-a"-
Evaporative emissions control,
(MS 42.0, MS 43.0)
E39 models with MS 42.0 or MS 43.0 engine are equipped
with a fuel system evaporative pressure leak diagnosis sys-
tem. The main component of this system is the leak diagnosis
pump (LDP or DM-TL). The function of either system is to
pressurize the fuel tank and the evaporative emission system
for the purpose of detecting leaks.

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.-
/Fuel Injection
I ' I - I
9 /ln~ut l~oltaqe supply I Fuse carrier, engine electronics
Table
c. Siemens MS 42.0 and MS 43.0 ECM pin assignments (continued) I ' I . I
Connector X60002 24-pin
1 linput IHeater, precatalyst oxygen sensor 1 I Heated oxygen sensor 1 in front of cat. conv.
I I I
18 llnout IHeater, post-catalyst oxygen sensor 2 ]Heated oxygen sensor 2 behind cat. conv.
Notes
Ground connector
Ground connector
B+ terminal
Fuse carrier, engine electronics
Pin
5
6
7
8
I I I
4 loutput l~hrottle valve supply (MS
42.0) I~hrottle valve (MS 42)
Signal
Ground
Ground Input
lnout
19
20 21
22
23
24
Connector
1
2
3
I I I
5 1 lnput ISignal, intake camshaft position sensor /camshaft position sensor 1
Componentlfunction
Ground
Ground
Terminal 30
Voltaae
SUDP~V
input
Ground
Ground
Ground
Input
Ground
X60003 52-pin
Input
Input
~ -
Heater, post-catalyst oxygen sensor 2
Ground, precatalyst oxygen sensor
1
Ground, precatalyst oxygen sensor 2
Ground, post catalyst oxygen sensor
1
ECM (DME main) relay signal activation
Ground, post catalyst oxygen sensor 2
Signal, mass air
flow sensor
Signal, exhaust camshaft sensor
Not used Heated
oxygen sensor 2 behind cat.
conv.
Heated oxygen sensor 1 in front of cat. conv.
Heated oxygen sensor 2 in front of cat. conv.
Heated oxygen sensor
1 behind cat. conv.
ECM
Heated oxygen sensor 2 behind cat. conv.
Hot film mass air flow sensor
Camshaft position sensor

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Fuel Injection
- If voltage is present as described above, check wiring be-
tween ECM and valve. If no wiring faults are found, check
ECM signal to valve.
- When replacing idle speed control valve, clean and inspect
all sealing areas.
. Inspect sealing ring in throttle body and replace if neces-
sary.
Throttle position sensor (TPS),
testing and replacing
The throttle position sensor (arrow) is mounted on the side
of the primary throttle housing and is directly connected to
the throttle valve shaft. The ECM sends a voltage signal to
the potentiometer-type sensor and monitors the voltage that
comes back. Resistance decreases (voltage increases) as
the throttle opens.
NOTE-
Do not confuse the TPS on the primary throttle housing with
the throttle switch on the
ASC secondary throttle housing.
4 Check throttle position sensor function by disconnecting har-
ness connector and checking across terminals. If any faults
are found, replace throttle position sensor.
Engine coolant temperature (ECT) sensor,
testing and replacing
Throttle position sensor (M62 engine)
The ECT sensor is located on the front of the engine in the
coolanVthermostat flange.The ECTsensor is a dual tempera-
ture sensor. One circuit provides coolant temperature infor-
mation to the ECM while the other circuit provides coolant
temperature information to the instrument cluster.
The ECM determines the correct ignition timing and
airlfuel
mixture required for the engine by monitoring an applied volt-
age
(5 vdc) to the sensor. The voltage drop across the sensor
Test
value
5 vdc (approx.)
4.0 kR(approx.)
Continuously variable
from
1.0 to 4.0 kR
without interruption
Test
conditions
Harness connector
disconnected, ignition on
Harness connector
disconnected,
ignition on
Throttle plate rotated from idle to
full throttle position Test Terminal
Term.
1 at
harness
connector and ground
Term.
1 and term. 3 at
sensor
Term.
1 and term. 2 at
sensor

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130-60
/Fuel lniection
Tabled. Bosch M5.2 ECM pin assignments
Note
Pin
21
20 I output / Crankshaft position sensor (speed and position) I Crankshaft positionlrpm sensor
23
I - I I 29 1 output I Idle speed control - opening winding I Idle speed control valve (cycled ground)
Type
22
1 output I Cvl. 6 ignition signal (primary signal) I Cyl. 6 ignition coil (RZV adapter)
output
25
26
27
28
Component/function
24 1 outout I Cvl. 7 iqnition siqnal (primary signal) I Cyl. 7 ignition coil (RZV adapter)
output
4 outbut I' I - I Cyl. 3
fuel injection valve I Cyl. 3 fuel injection valve (cycled ground)
Camshaft position
sensor (cylinder reference)
output input
output
oround
30
31
32
ground Hall effect camshaft position sensor
Cyl. 3 ignition signal (primary signal)
output
I
Cyl. 3 ignition coil (RZV adapter)
. - . .. . .
Cyl. 2 ignition signal (primary signal)
Terminal 30
Engine control module relay
Ground for electronics and sensor shield
output
output
outout
Remaining output stages ground
(not iclnition and fuel iniection valves) Cyl.
2 ignition coil (RZV adapter)
Fuse carrier, engine electronics
Engine control module relay
Ground splice ,
Cyl. 2 fuel injection valve
Oxygen sensor heater signal
Cyl. 5
fuel injection valve
Cvl. 8 fuel iniection valve
AIC comuressor relav sianal
Heated oxygen sensor I in front of catalytic converter,
Heated oxygen sensor
iI in front of catalytic converter
Cyl.
5 fuel injection valve (cycled ground)
Cvl. 8 fuel iniection valve (cycled ground)
. -
Not used Ground point
Cyl.
2 fuel injection valve (cycled ground)
Heatinq and AIC control module (ground - compressor OFF)
38 Not used
40 39
1 I Not used
I'
I . I
I' I -. I
46 1 ground I Heated oxygen sensor signal (voltage 0.1-1.0 V) I Oxygen sensors
41
1 inuut I Knock
sensor signal I Knock sensor
input
I
I I
Instrument cluster
I' I I 55 1 ground I Ignition ground I Ground point
Knock sensor signal
43
1 I Not used I
Fuel reserve signal
42
Throttle position sensor
47
48
49
50
51
52
53
54
Knoclc sensor
input
45
1 outout I Hot film mass air flow sensor signal (0-5 V) I Hot film mass air flow sensor
Throttle position sensor signal
(0.4-4.2 V) 44
input
output
output
output
output
output
inout
I - I
Not used
Not used
Cyl. 1 ignition signal (primary signal)
Cyl. 5 ignition signal (primary signal)
Cyl. 4 ignition signal (primary signal)
Cyl. 8 ignition signal (primary signal)
Throttle position sensor
(c 5 V voltage supply)
Terminal 87
f> 10 V)
ignition switch
56
Cyl. 1 ignition coil (RZV adapter)
Cyi. 5 ignition coil (RZV adapter)
Cyi.
4ignition coil (RZV adapter)
Cyl. 8 ignition coil (RZV adapter)
Throttle position sensor
Fuse
F1
input Terminal 15 (> 10 V)

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130-62
Fuel Injection
Bosch M5.2.1
ECM pin assignments
(M62 from 911 997 to 911 998)
Table e. Bosch 5.2.1 ECM pin assignments
i I I
5 1 I Not used
I
I I
Note
I I I
7 lln~ut l~erminal 30 voltage supply I Fuse
F4
Description
Pin
Ground point right-hand drive
Ground connector
X6460
I I I
Signal
Connector
X60001
Ground 4 1
2
3 Ground
Ground point right-hand drive
Ground connector
X6460 6
8
9 1
2
3
4
5
Not used
Not used
Not used
-
6
7
8
9
10 11
12
Ground
Input
Connector
X60002
Output Input Input Output
Input Output
Grniind
. -
13
14
15
Ground
- .- -
Output
Ground
Ground
Ground
Ground
16
17
18
19
20
21 22
23
.
Terminal 87
Not used
Oxygen sensor heater
slgnal
Not used
CAN-Bus low
CAN-BUS high
Ground
Output Input
ln~ut
Fuse F1
Heater oxygen sensor II behind cataiytic converter
Back up light switch
Transmission control module (AGS)
Transmission control module
(AGS)
Ground connector X6480
Not used
Oxygen sensor heater signal
Oxygen sensor heater ground
Oxygen sensor heater ground
Oxygen sensor heater ground
Oxygen sensor heater ground
Not used
Input
Input
Output
Output
Output Heater oxygen sensor
I behind catalytic converter
Heater oxygen sensor
II behind catalytic converter
Heater oxygen sensor
1 in front of catalytic converter
Heater oxygen sensor
II in front of catalytic converter
Heater oxygen sensor I behind catalytic converter
Oxygen sensor heater ground
Oxygen sensor heater ground
Oxvqen sensor heater ground Heater oxygen sensor
iI in front
of catalytic converter
Heater oxygen sensor
II behind catalytic converter
Heater oxygen sensor
1 in front of catalytic converter . -
Oxygen sensor heater ground
Oxygen sensor heater ground
Signal, running losses
Oxygen sensor iieater ground
Not used
Not used
Not used
Terminal
85 control
Heater oxygen sensor II in front of catalytic converter
Heater oxygen sensor
I behind catalytic converter
Fuel changeover
(312 way valve) circuit
Heater oxygen sensor 1 in front of catalytic converter
Engine control module relay

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Fuel Injection I
Engine coolant temperature (ECT) sensor,
testing
The ECT sensor is located on the front of the engine in the
coolant~thermostat flange. The ECT sensor is a dual temper-
ature sensor. One circuit provides coolant temperature infor-
mation to the ECM while the other circuit provides coolant
temperature information to the instrument cluster.
The ECM determines the correct ignition timing and
airlfuel
mixture required for the engine by monitoring an applied volt-
age
(5 vdc) to the sensor. Thevoltage drop across the sensor
varies as the coolant temperature (sensor resistance) chang-
es.
NOTE-
The ECT sensor is an NTC (negative temperature coeffi-
cient) type sensor. In other words, as the temperature rises,
resistance through the sensor decreases.
If the ETC sensor input is faulty or non-plausible, the MIL is il-
luminated when OBD
II fault criteria are exceeded. The ECM
assumes a substitute value
(80" C/ 176°F) to maintain engine
operation. The ignition timing is set to a
conse~ativelsafe ba-
sic setting.
Disconnect harness from
ECTsensor (A) at coolant flange at
front of engine.
- Check ECT sensor resistance using a multimeter at sensor
terminals
3 and 4. Peel back protective boot (B) to ID termi-
nal numbers on connector housing.
I ECT sensor resistance @ 20" C (68°F) I 2.2 - 2.7 lkCi
Engine coolant temperature (ECT) sensor,
replacing
I WARNING-
/ Due to risk ofpersonal injury, be sure the engine is cold be- I
I fore replacin~~~~sensor. -
-
I
- Disconnect ECT sensor harness.
- Unscrew ECT sensor from cylinder head and install new sen-
sor.
Use new copper sealing washers when installing sensor.
Replace any lost coolant.
Tightening torque
ECT sensor to coolant flange 13 Nm (10 it-lb)