Siemens Ms 41.1 Ecm Pin Assignments - BMW 5251 Service Manual

Fuel
Injection
I
-
As an alternative, harness connector housing can be sepa-
rated so that electrical checlts can be made from backof con-
nector.
4
If replacing ECM, disconnect control module harness con-
nector (arrow) by releasing fastener and pivoting connector
up and off ECM.
CAUTION-
Be sure ignition is OFF before disconnecting or reconnecting
DME system components.
-
Remove ECM from retaining brackets and lift off holder.
-
Installation is reverse of removal.
-
Before attempting to start engine, use BMW service tester
DISplus, MoDiC, GTI or equivalent:
-
Code replacement ECM with application information (i.e.
engine code, transmission type, etc.).
Align ECM to EWS (electronic immobilizer).
Siemens MS 41.1 ECM pin assignments
ECM pin assignments are given in Table b. For engine man-
agement system schematics, see ELE Electrical Wiring Di-
agrams.
CAUTION-
a
Always wait at least one minute after turning off the ignition
before removing the connector from the ECM. If the con-
nector is removed before this time, residual power in the
system relay may damage the ECM.
Always connect or disconnect the control module con-
nector and meter probes with the ignition off
When malting checks at the ECM itself, a breakout box
should be used to allow tests to be made with the connector
attached to the ECM. This also prevents damage to the small
terminals in the connector. As an alternative, the harness
connector housing can be separated so that electrical checlts
can be made from the back of the connector.
Table b. Siemens MS
41.1
ECM pin assignments
Pin
1
2
3
4
Signal
output
output
output
qround
Componenfffunction
Ignition coil control, cyl.
2
Ignition coil control, cyl.
4
ignition coil control, cyl.
6
Ground
Notes
Primary signal, ignition coil
2
Primary signal, ignition coil
4
Primary signal, ignition coil
6
Ground