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

130-1 8
1
Fuel
injection
Secondary air injection
1. Secondary air pump (in right
front wheel housing)
2. Secondary air vacuum vent
valve solenoid (on intake mani-
fold)
3. Secondary air check valve
4.
Intake manifold
5.
Exhaust manifolds
6. Diverter valve (at exhaust mani-
fold)
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.
Prior to disconnecting the battely, read the battery discon-
nection cautions in 001 General Warnings and Cautions.
Access engine control module (ECM):
Release interior ventilation filter cover latch (A) and re-
move cover.
Release plastic locking tab (B).
Rotate air duct inward (arrow) to unloclc from bulk head
and remove duct.
Release spring lock (C) to remove lower filter housing.
Slide filter housing 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 the
ECM. This prevents damage to small terminals in connector.