Testing Lambda Control - Skoda Octavia Workshop Manual

OCTAVIA
Read measured value block 9
1 2
Edition 03.98
S00.5107.52.20
Fuel Formation / Fuel Injection
K Readout in display:
→
3 4
(1...4 = display blocks)
- Note the engine speed shown in display block
1.
- Note the lambda probe voltage shown in dis-
play block 3 and the range within which it
varies.
- Spray the parts of the intake system system-
atically with engine leak detection spray.
If there is no change to the engine speed or to
the lambda probe voltage:
- Press the → key.
- Press keys 0 and 6 for the function „End
output“ and confirm the entry with the key Q.
If the engine speed drops or if there is a change
to the lambda probe voltage:
- Press the → key.
- Press keys 0 and 6 for the function „End
output“ and confirm the entry with the key Q.
- Inspect the sprayed part of the intake sys-
tem for leaks and rectify the fault.
Testing
The lambda probe compares the oxygen con-
tent of the air with the residual oxygen in the
exhaust gas and supplies a voltage signal to
the engine control unit.
The voltage signal „rich mixture“ (low level of
residual oxygen) is at approx. 0.7...1.0 V (re-
lated to reference earth).
The voltage signal „lean mixture“ (large level of
residual oxygen) is at approx. 0.0...0.3 V (re-
lated to reference earth).
A voltage jump from 0.7...1.0 V to 0.0...0.3 V
and vice versa takes place at the transition from
„rich mixture“ to „lean mixture“ and vice versa.
control
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