Volkswagen Passat 1995 Official Factory Repair Manual page 2242

General information for On Board Diagnostic (OBD)
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General information for On
Board Diagnostic (OBD)
Characteristics of On Board Diagnostic
(OBD)
Engine Control Modules (ECM) and
Transmission Control Module (TCM) are
equipped with a DTC memory.
Malfunction recognition
If malfunctions occur at the exhaust relevant
systems or components, they are stored in DTC
memory with a description of the malfunction
type.
The Engine Control Module (ECM) differentiates
between different DTCs after evaluating the
information DTC tables,
The stored malfunctions can be checked with a
standard diagnostic tester
Diagnostic mode 3: Check DTC memory.
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 Page ST-50
Page 1 of 12
Page ST-54 .
Page ST-21 ,
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ST-1
12/6/2004