Skoda OCTAVIA 2004 Workshop Manual page 25

OCTAV1A
Readout on V.A.G 1552
Fault number
old new
16500
Coolant tempera-
ture sender -G62
Implausible sig-
nal
16955
Brake light switch
-F
Implausible sig-
nal
17811
Exhaust gas
recirculation sys-
tem
Control devia-
tion
Edition 01.04
S00.5111.56.20
Possible cause of fault
-
♦ Sender for coolant tem-
perature -G62 supplies
implausible signal caused
by loose contact or corro-
sion due to humidity in the
connector
♦ Signal input in engine
control unit defective
(control unit defective
♦ Coolant regulator defec-
tive (thermostat)
-
♦ Brake light defective
♦ Line interruption or short-
circuit to positive or earth
between brake light switch
and engine control unit
-
♦ Exhaust gas recirculation
valve -N18- defective
♦ Exhaust gas recirculation
potentiometer -G212- de-
fective
Self-Diagnosis
Possible effects
♦ Cold-start difficulties at
very low temperatures
♦ Poor driveability during
warm-up
♦ Increase in fuel consump-
tion
♦ Increased emission levels
♦ Brake light does not light
up
♦ Engine speed fluctuations
during braking
♦ Exhaust gas recirculation
system not operational
♦ Mixture adaptation not op-
erational
Rectifying fault
- Reading measured value
block, display group 007
⇒ page 01-51
- Check -G62 ⇒ page 23-43
- Replacing engine control
unit ⇒ page 23-20
- Check coolant regulator
⇒ 1.9 l/66 kW (TDI) Engine,
Mechanical Components;
Repair Group 19
- Check brake light switch
and brake pedal switch
⇒ page 23-44
- Check exhaust gas
recirculation solenoid
valve ⇒ page 01-18,
Actuator diagnosis
- Check exhaust gas
recirculation valve
⇒1.9 l/66 kW (TDI) En-
gine, Mechanical Compo-
nents; Repair Group 26
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