Volkswagen Passat 1995 Official Factory Repair Manual page 1608

On Board Diagnostic (OBD)
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On Board Diagnostic (OBD)
Function
The Motronic Engine Control Module (ECM)
(J220) for the fuel injection and ignition
system is equipped with a Diagnostic Trouble
Code (DTC) memory.
If malfunctions occur in the sensors and
components being monitored, they will be
stored in the DTC memory together with an
indication of the type of malfunction.
The stored codes can be displayed by
initiating the DTC display
DTC memory must be erased once the
malfunction has been eliminated
30 .
A malfunction relating to the function of the
Oxygen sensor control system can only be
interrogated after a test drive of at least 10
minutes duration.
Malfunctions which can be attributed to a
temporary open circuit in the wiring or a loose
terminal, will also be stored. These
malfunctions will be displayed as sporadic
"SP" and are automatically cancelled if they
are not repeated after 50 engine starts.
Note:
Only for vehicles with Malfunction Indicator
Lamp (MIL):
The MIL lamp in the instrument cluster should
light up when the ignition is switched on and
go out when the engine has started.
If malfunctions occur in the sensors and/or
components and the monitoring conditions
are satisfied, the MIL lamp will also light up
with the engine running.
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