Skoda OCTAVIA 2004 Workshop Manual page 127

OCTAVIA
Read measured value block
900 rpm 272 mg/H
Final control diagnosis
EGR valve -N18
Edition 03.98
S00.5111.52.20
Fuel Formation / Fuel Injection
3
→
268 mg/H 54 %
→
♦ Fault in fault memory
K - Check the readout in display block 3 (actual
air mass).
Specification: should agree with specified air
mass in display block 2
(tolerance ± 20 mg/H)
If the actual air mass is more than 20 mg/H lower
than the specified air mass, the following faults
are possible:
♦ Unmetered air in intake area
♦ Excessive exhaust gas recirculation
If the actual air mass is more than 20 mg/H
higher than the specified air mass, the follow-
ing faults are possible:
♦ Engine has been idling for 3 minutes
♦ Insufficient or no exhaust gas recirculation
If the actual air mass is a constant 425 mg/H,
the following faults are possible:
♦ Open circuit in wiring to air mass meter
♦ Implausible air mass detected
If the specifications are not achieved:
- Start final control diagnosis and operate the
EGR valve page 01-18.
K Readout in display:
The valve should click.
If the valve does not click:
- Test EGR valve (N18)
If the valve clicks:
- Check the vacuum hoses
If the vacuum hoses are o.k.:
- Test mechanical exhaust gas recirculation
valve:
1.9-ltr./66 kW Engine, Mechanical Compo-
nents; Repair Group 26; Exhaust gas
recirculation system
page 23-34.
page 23-37.
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