Engine Control Module: Service and Repair

Engine Control Module (ECM), Replacing

Special tools and equipment
VAG1551 Scan Tool (ST) with VAG1551/3 adapter cable

Removing
- First print out control module identification and thereby previous control module coding as follows:
- Connect VAG1551 (VAG1552) Scan Tool (ST).
- Switch ignition on and press buttons -0- and - 1- to insert "Engine Electronics" address word 01.

The control unit identification and coding are indicated on the display, e.g.:


021906018B MOTRONIC ME7.1 G V06 ->
Coding 00000 WSC 00000


- Print out control module identification by pressing scan tool PRINT button.
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Switch ignition off.
- Remove wiper arms and plenum chamber cover.
- Release harness connector from control module and disconnect.







- Press retaining tab (arrow) to left and remove control module.

Installing
- Place new control module into retaining frame.
- Install control module harness connector and lock.
- Check previous coding and coding of new control module.
- Adapt ECM to immobilizer.
- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
- Adapt new control module to throttle valve control module.
- Activate cruise control system.
- Check idle speed.
- Generate readiness code.