Self-Diagnosis - Skoda Octavia Workshop Manual

OCTAVIA
Edition 03.97
S00.5116.51.20
Self-Diagnosis/Electrical Test

Self-diagnosis

Function of self-diagnosis
The control of the automatic gearbox is per-
formed electronically/hydraulically.
The term „self-diagnosis“ relates to this electri-
cal/electronic control.
Control unit -J217- with driving situation
shifts (fuzzy logic)
The determination of the gearbox shift point in
line with the driving situation and resistance is
carried out automatically.
Advantages:
l Gearshifts are conducted to achieve good
fuel economy
l Maximum engine power is always available
l Individual adaptation of shift points to all driv-
ing situations
l Shift points can be altered as desired
Variation of shift points on uphill or down-
hill sections
When driving on uphill or downhill sections, the
gearshifts are selected automatically by addi-
tional shift maps as a function of accelerator
pedal position and vehicle speed.
l Shift map for driving on extreme uphill sec-
tions is matched to engine power
l Shift map for driving on extreme downhill sec-
tions is matched to the braking effect of the
engine
Functions of the gearbox control unit
The automatic gearbox control unit -J217- re-
ceives information from components which af-
fect the gearshifts and passes on this informa-
tion to the solenoid valves with which the con-
trol valves in the control valve housing are op-
erated.
To enable the cause of a failure of an electrical/
electronic component or an open circuit in the
wiring to be determined as rapidly as possible,
the control unit is equipped with a fault memory.
Faults are detected by electrical signals and
stored in the fault memory.
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