2000 BMW 525i instrument cluster

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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
Engine coolant temperature
(ECT) sensor,
testing and replacing
4 The ECT sensor is located below cylinder 6 intake port at the
rear of the engine (1).
The ECT sensor is a dual temperature sensor. One circuit
provides coolant temperature information 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
forthe engine temperature by monitoring an
appliedvoltage
(5vdc) to the sensor.Thevoltage drop across
the sensor varies as the coolant temperature (sensor resis-
tance) changes.
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 the MIL is illuminated when
OED II fault crite-
ria are exceeded. The ECM assumes a substitute value
(80" C 11 76'F) to maintain engine operation. The ignition tim-
ing is set to a
conservativelsafe basic setting.
- Remove intake manifold to access ECT sensor on the M52
TU and the M54 engines. See 113 Cylinder Head Removal
and Installation.
- Check ECT sensor resistance using a multimeter at sensor
terminals.
WARNING -
Due to rislc of personal injury, be sure the engine is cold be-
fore removing ECT sensor connector.
ECT sensor resistance @ 20°C (68°F)
CAUTIOI\C
Be sure ignition is OFFbefore disconnecting or reconnecting
DME svstem components.
2.2 - 2.7 k
4 Disconnect ECT sensor harness connector (arrow). Un-
screw ECT sensor from cylinder head.

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Fuel Injection
Table c. Siemens MS 42.0 and MS 43.0 ECM pin assignments (continued)
Pin
42
43
44
45
46
47
48
49 50
51
52 Componentlfunction
Signal, evaporative emissions valve
Signal, throttle
valve drive
Signal, throttle valve drive
Signal, engine coolant thermostat
Signal, close idle speed control valve
Signal, open idle speed control valve
Signal, shield
ltnock sensor
Signal, resonance valve
intake system
Not used
Not used
Signal, secondary air injection pump valve
Signal
Input
Input
Input
Input
input
Input
Ground
Input
Input
Notes
Evaporative emissions valve
Throttle valve
Throttle valve Engine coolant thermostat (map controlled)
idle speed control valve
Idle speed control valve
Shield,
knock sensor
Resonance valve intake system
Secondary air injection valve
Connector
X60004 40-pin Notes
instrument cluster control unit
Instrument cluster control module
Secondary air injection pump relay
Electric (auxiliary) fan motor
Pedal position sensor (PWG) (MS 43.0)
Pedal position sensor (PWG) (MS 43.0)
Pedal position sensor (PWG) (MS 43.0)
Fuel pump relay
1
Instrument cluster control module
ComponenVfunction
Signal, battery charge indicator lamp
Feedback signal, engine start
Signal, secondary air injection pump
Signal, electric cooling fan
Not used
Not used
Pedal position sensor (PWG) (MS 43.0)
Signal, pedal position sensor (PWG) (MS 43.0)
Pedal position sensor (PWG) (MS 43.0)
Signal,
fuel pump relay 1
Signal, oil pressure switch
Pin
1
2 3
4
5
6
7
8
9
10
11 Signal
Input
Input
input
input
Input
Input

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Fuel Injection
M5.2 system features
The Bosch M5.2 system used on 1997 540i models uses an
88-pin control unit. The
M5.2 system has the following func-
tions and capabilities:
Fully sequential cylinder-individual fuel injection.
Integrated adaptive knock control.
Oxygen sensor fuel mixture control.
0 Self-diagnosis and emergency operation characteristics.
CAN-Bus link.
0 OED II functions (misfire detection, catalytic converter
monitoring, oxygen sensor monitor, and fuel tank ventila-
tion system).
Electronic vehicle immobilization via EWS.
One-touch starter function.
Control of characteristic map thermostat.
M5.2.1 system features
The Bosch M5.2.1 system is used on 1998 540i models. The
M5.2.1 control module utilizes the SKE (standard shell con-
struction housing) with 5 connectors and a combined total of
134 pins.
The M5.2.1 systefn has
tile following functions or capabilities:
Separate power supply relay for ignition coils. Leak diagnosis pump (LDP) control and feedback
rnonitor-
ing for evaporative system leak testing.
Fuel evaporative system providing ORVR (on-board refuel-
ing vapor recovery) compliancy.
Batterylalternator charge logic (idle speed varied with the
battery state of charge).
CAN-Bus communications with the instrument cluster
EWS
Ill "rolling code" ISN interface.
More sensitive ignition
knock sensors.
Pulse width modulated (P-W-M) Heating and
AIC (IHKA)
status signal.
Running loss (312-way) solenoid valve.

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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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-. -
Fuel Injection
I 68 1 / Not used
Table
d. Bosch
M5.2 ECM pin assignments
I I I
69 1 input I AIC system standby signal (> 10 V) 1 Heating and AIC control module
Pin
57
58
59
60
61
62
63
64
65 66
67
Type
input
input
input
input
I 70
72
73
74
Componentlfunction
Not used
Not used
Heated thermostat (characteristic map, cooling)
Programming voltage input (voltage
value)
Signal input Evaporative emission valve
Not used
Fuel pump relay (ground)
Not used
Not used
Not used
Not used
75
76
77
78
79
80
Note
Characteristic map, cooling
Data
llnlc connector
Evaporative emission valve
Fuel pump relay
71 1 ground I Control module ground I Ground splice
input
input
81
input input
input
input
output Not used
I
Knock sensor signal
Not used
Not used
Coolant temperature
82 1 I Not used
83
I I
Knock sensor
Dual temperature
swltch
Not used
Heated oxygen sensor signal (voltage
0.1-1.0 V)
Heated oxygen sensor
signal (voltage 0.1-1.0 V)
Crankshaft position sensor signal (speed and
position, AC voltage)
Right rear wheel speed signal
TD signal (engine speed)
85
I I I
Heated oxygen sensor II behind catalytic converter
Heated oxygen sensor
I behind catalytic converter
Cranitshaft positionlrpm sensor
ABSIASC control module
TD signal splice
84 1 / Not used 1
output
88
86
1 input-output 1 CAN-Bus high I Transmission conlrol module (AGS)
input-output
Injection signal
input-output Integrated instrument cluster control
module (IKE)
CAN-Bus low Transmission control module (AGS)
Data
linlc TxD Data link connector

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-
Fuel Injection
Table e. Bosch 5.2.1 ECM pin assignments
Pin
I~iqnal 1 Description 1 Note
I I I
46 llnput ICrankshaft position sensor Icrankshaft positionlrpm sensor
38
39
40
41
42
43
44
45 Ground Input
Output
Output
Output
Output
Ground
47
48
49
50
51
Not used
I Not used
52
Shield, knock sensor
Oil level
- thermal
Injection signal
injection signal
Idle speed control - opening winding
Idle speed control - closing winding
Not used
Ground
Ground
-- Ground Input
Ground
Ground Not used Knock sensor
Oil level sensor
Cylinder
4 fuel injector
valve
Cylinder
1 fuel injector valve
Idle speed control valve
Idle speed control valve
Shield, crankshaft sensor
5
6
7
12 Not used
Ground
Intake air temperature sensor
Connector
X60004
8
9 10
11
14 1 1 Not used I
Shield, knock sensor
Shield, sensor
I
Shield, sensor 3
Shield, itnock sensor
Input
- Knoclc sensor
Knock sensor
Knock sensor
Knock sensor
Instrument cluster
Output
2 llnput l~erminal 30 voltage supply /Megrated instrument cluster control module (IKE)
Alt. charge indicator signal, terminal 61 1
Not used
Start signal terminal
50
Not used
15
16
17
18
Output
Ignition switch
Not used
Not used
Activation of relay for fuel pump
Not used
19
Fuel pump relay
Output Not used
I I I 20 loutput ICARB signal /Data link connector
Not
used
Not used
Engine speed signal output (TD)
Not used
Light module
21
Cruise control module (Tempomat)
22 llnput I Right rear wheel speed signal /ABS/ASC or ABSIDSC control module
Oulput
Washer
fluid level,
brake fluid level