Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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New System Description

New System Description

Fig. 1:





The MS45.1 system is a further enhancement of the MS45 system currently used on M54 engines and manages the following functions: See Fig. 1

The basic engine management inputs, processes and outputs are not included here because they have not changed, refer to previous model series systems using Siemans MS 42 XXX controls.

Also, refer to (E85) Z4 for additional detailed information on the MS45 Engine Management System.MS45 With M54 Engine

The following section is based on new controls / functions for MS45.1 system.
Engine Management