Skoda Octavia Workshop Manual page 15

OCTAVIA
Readout on V.A.G 1552
00530
Throttle valve positioner/
potentiometer -G88 1)
Open/short circuit to
positive
Short circuit to earth
00532
Supply voltage
Signal too large
00537
Lambda control
Control limit exceeded
1)
The throttle valve positioner/potentiometer (G88) is part of the throttle valve control unit (J338).
Edition 11.98
S00.5109.51.20
Self-Diagnosis
Possible cause of fault
♦ Open circuit in wiring or
short circuit to positive
♦ G88 faulty
♦ Cable has short circuit to
earth
♦ G88 faulty
♦ Battery voltage greater
than 16.3 V
♦ Lambda probe heater
faulty
♦ Leak in exhaust system
between cylinder head and
catalytic converter
♦ Ignition misfiring
Possible effects
♦ Cold start problems
♦ Idling speed not within
tolerance
♦ Cold idling problems
♦ Irregular idling
♦ No idling speed adaptation
♦ No lambda control
♦ Poor drivability
♦ Poor idling
♦ Emission levels not o.k.
Rectifying faults
- Test G88
⇒ page 24-17, Testing
throttle valve control unit
- Test generator
⇒ Current Flow Diagrams,
Fault Finding Programmes
and Fitting Locations
- Test lambda probe heater
for open circuit in wiring
⇒ page 24-13
- Inspect exhaust system for
leaks
- Testing ignition system
⇒ page 28-1
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