Volkswagen Passat 1995 Official Factory Repair Manual page 1248

Motronic fuel injection and ignition system
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General Notes on Fuel Injection
Servicing ignition Page 28-1
Note:
Engine Control Module (ECM) is equipped with
On Board Diagnostic (OBD). Always check
DTC memory first, before performing repairs or
troubleshooting. Vacuum hoses and
connections should also be checked (false air).
For the electric components to work properly, a
voltage of at least 11.5 V is required.
Do not use any silicone sealant. Traces of
silicone components which are sucked into the
engine are not burned there, and they damage
the oxygen sensor.
The battery must only be disconnected and
connected with the ignition switched off, since
the Engine Control Module (ECM) can be
damaged.
Fuel hoses at engine must be secured with
spring-type clamps. The use of clamping collars
or screw clamps is not permitted.
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6/12/2004