Volkswagen Passat 1995 Official Factory Repair Manual page 1519

General information for On Board Diagnostic (OBD)
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW...
Procedure for Engine Control Module (ECM)
- Disengage connector from control module and
then disconnect it.
- Connect test box (V.A.G1598/18A) at control
module wiring harness.
When harness connector is disconnected from the
Engine Control Module (ECM) or the battery is
disconnected, all adaptation values in the control
module are erased. DTC memory content will
remain intact however. If the engine is started after
this, rough, uneven idle can result. In this case, the
readiness code must be generated again
ST-52 .
Page 12 of 13
ST-12
Page
6/12/2004