Idle Speed/Throttle Actuator - Electronic: Service and Repair

13 41 500 - Replacing idle speed control valve (M52TU/M54)





Necessary preliminary tasks:
- Switch off ignition.
- Disconnect battery ground wire.
- Observe instructions for disconnecting and connecting battery Instructions for Disconnecting and Connecting Battery.





M52TU only:
Remove intake filter housing.
Pull Bowden cable upwards out of holder (1) and suspend from throttle.





Loosen hose clamps (1).
Detach air intake hose section from throttle assembly and idle actuator.





Installation:
To facilitate installation, fit air-mass flow sensor with intake hose (1). Coat intake hose (1) with antiseize agent.





M54 E46/E53 only:
Remove complete intake hose (between intake filter housing and throttle assembly).
M54 E60/E61/E65/E66 only:
Remove intake hose Service and Repair.





M52TU and M54:
Unfasten following plug connections:
(1) - Resonance flap
(2) - Idle speed control valve





Installation location:
Idle actuator (2) is fitted below intake air manifold, directly above throttle (1).





Release screw (1) on cable duct mounting.
Release screws (2) on holder of idle actuator (3).
Remove idle actuator with holder from intake air manifold.





Detach idle actuator (2) from rubber retainer (4).
Always replace gasket (1) from idle actuator (2) to intake air manifold. However, during reinstallation, do not fit gasket on idle actuator but install first in intake air manifold.





Installation:
Replace seal (1).
Coat gasket (1) on inside with antiseize agent.





Note:
Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Then clear fault memory.