Engine Control Module (Ecm); Removing And Installing - BMW 5251 Service Manual

130-40
Fuel Injection
Engine control module (ECM),
removing and installing
The ECM uses stored functions and processing programs to
process the input signals from the sensors. These input sig-
nals are used to calculate the control (output) signals to the
actuators (e.g., ignition coils, injectors).
NOTE-
Consult an authorized BMW dealer before replacing the
ECM.
-
Disconnect negative (-) battery cable. Wait approximately
one minute.
CAUTION-
Prior to disconnecting the batteg read the battery discon-
nection cautions in 001 General Warnings and Cautions.
4
Access engine control module (ECM):
Release interlor ventilation filter cover latch (A) and re-
move cover.
Release plastic loclting tab (B).
Rotate air duct inward (arrow) to unloclt from bulk head
and remove duct.
Release spring lock (C) to remove lower filter housing.
Slide f~lter hous~ng away from inner fender to remove.
-
Remove electrical box (E-box) cover fasteners and remove
cover.
-
If testing ECM or connected components, use breakout box
to allow tests to be made with connector attached to ECM.
This prevents damage to small terminals in connector.
-
-
As an alternative, harness connector housing can be sepa-
rated so that electrical checks can be made from back of con-
nector.
4
If replacing ECM, disconnect control module harness con-
nector (arrow) by releasing fastener and pivoting connector
up and off ECM.