BMW 5251 Service Manual page 404

Fuel Injection
-
If idle speed valve is not buzzing, or if idle decreases when
AIC is turned on, stop engine and disconnect harness con-
nector from idle speed valve.
connector
CAUTION-
Be sure ignition is OFFbefore disconnecting or reconnecting
DME system components.
Checlc resistance of valve across valve terminals.
Idle speed control valve resistance
Terminals
1
and
2
20 i-2Q
Terminals
2
and
3
20 C2Q
Terminals 1 and
3
40 C4Q
The idle speed control valve is mounted under the intake
manifold. Accessing the valve is best accomplished by first
removing the air filter housing and the throttle housing.
<
Disconnect intake air boot from throttle housing. Unbolt throt-
tle body and lay aside. Do not disconnect throttle cable or
electrical harness connectors to throttle body.
NOTE-
For additional worlcing room, unfasten and lift out the com.
plete air filter housing.
-
Working under intake manifold, disconnect electrical harness
connector from idle speed control valve.
Unbolt dipstick tube bracket (A) from intalte manifold.
-
Remove two bolts (B) retaining idle speed control valve to un-
derside of intalte manifold. Remove valve from intalte mani-
fold. Remove hose clamp and disconnect hose.
-
Installation is reverse of removal. Use new gaskets when in-
stalling.