Skoda OCTAVIA 2004 Workshop Manual page 156

23
Read measured value block
0 km/h 0 0 0
Read measured value block
0 km/h 0 0 0
Read measured value block
0 km/h 0 1 1
Read measured value block
0 km/h 0 0 0
------------ 23-44 ------------
Fuel Formation / Fuel Injection
6
K Readout in display:
→
000000 0
6
K
→
000000 0
6
K
→
000000 0
6
K
→
000000 0
Testing brake light switch and
brake pedal switch
In view of the fact that the fuel injection system
operates with an accelerator pedal sender
(potentiometer), which could develop a fault, the
engine is governed for safety reasons when the
brakes are applied. The control unit requires the
brake light switch signal and, in addition, the
brake pedal switch signal for this purpose. What
this means, therefore, is that, if the brake is op-
erated when the accelerator pedal is constantly
depressed, the engine is immediately governed
down to idling speed. If the switch positions are
not clearly detected, this can result in uninten-
tional governing of the engine speed.
Special tools, testers and aids required
♦ Vehicle system tester V.A.G 1552 with cable
V.A.G 1551/3
Procedure
- Read measured value block, display group
006, engine idling
- Check readout in display block 2.
Specification: 0 0 0
- Slowly depress brake.
Specification: 0 1 1
Both readouts should jump from 0 to 1.
♦ Middle readout = brake pedal switch
♦ Right-hand readout = brake light switch
- Slowly release brake pedal into rest position.
Specification: 0 0 0
Both readouts should switch back again from
1 to 0.
If one of the readouts or both does not switch
from 0 to 1:
- Test the switches or the cable connections
to the switches.
Current Flow Diagrams, Electrical Fault
Finding and Fitting Locations binder
OCTAVIA
page 01-33.
Edition 03.98
S00.5111.52.20