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

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OBD II, Control Module Functions




Control Module Features
- Data transfer between Control Module and VAG 1551/ VAG 1552 Scan Tools is processed in the "Rapid data trans mode
- DTC memory is equipped with a non-volatile memory

Control Module Identification
VAG 1551 Scan Tool, connecting and ECM selecting. See 'Testing and Inspection, Procedures, Address word 01.' Testing and Inspection

Control Module Functions
- The ECM is equipped with a variety of Functions.
- Some Functions require the ignition ONLY to be switched ON, other Functions require the engine to be running.
- The table below details which requirements apply to the individual Functions.


Functions: