Volkswagen Passat 1995 Official Factory Repair Manual page 1741

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On Board Diagnostic (OBD II)

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Malfunction Indicator Lamp (MIL)

If malfunctions are recognized and verified by the

engine control module, they will be indicated by

switching on the MIL.

Location of Malfunction Indicator Lamp (MIL).

The MIL can be switched on in the flashing or

permanently on mode. The Diagnostic Trouble Code

(DTC) memory must be checked in every case

Flashing: There is a malfunction that can damage

the Three Way Catalytic Converter (TWC) if

driven in this condition. In this case, the vehicle

must not be driven using wide open throttle, but

with partial throttle only, during which the MIL is

continuously illuminated rather than flashing.

Permanently on: There is a malfunction which will

increase exhaust emissions. Check engine and/or

automatic transmission control modules.

If the MIL does not light up: If there is an engine

running problem, or a customer complaint of one,

perform a functional check of the MIL. Then DTC

memory must be checked because malfunctions

that do not switch on the MIL immediately can

also be stored.

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