Skoda Octavia Workshop Manual page 32

01
Display Readout on V.A.G
block 1552
3 less than 4 ∠°
greater than 10 ∠°
4 less than 22 %
or
greater than 41 %
------------ ------------
Self-Diagnosis
Possible cause of fault
♦ Throttle valve potentiometer in throttle
valve control unit faulty or incorrectly set
♦ Unmetered air between intake manifold
and air mass meter
♦ Basic setting not performed
♦ Throttle valve potentiometer in throttle
valve control unit faulty or incorrectly set
♦ Throttle cable incorrectly set
♦ Throttle valve sticking
♦ Air conditioning on
♦ Electrical components on
♦ Lambda control at limit of lean or rich
mixture
♦ AC compressor running although AC off
♦ Unmetered air downstream of throttle valve
♦ Vacuum hoses detached
♦ Fuel pressure regulator
Rectifying fault
- Test throttle valve control unit
⇒ page 24-17
- Rectify cause of unmetered air
- Carry out basic setting ⇒ page 24-10
- Test throttle valve control unit
⇒ page 24-17
- Adjust throttle cable and check
⇒ Engine, Mechanical Components; Repair
Group 20
- Switch off air conditioning
- Switch off consumers
- Test lambda control ⇒ page 24-12
- Test AC compressor switch ⇒ page 01-12,
Final control diagnosis
- Rectify cause of unmetered air
- Inspect attachment of vacuum hoses
- Test fuel pressure regulator and holding
pressure ⇒ page 24-44
OCTAVIA
Edition 11.98
S00.5109.51.20