Testing Lambda Probe -G130- And Lambda Control Downstream Of Catalytic Converter - Skoda Octavia 1997 Workshop Manual

24
Testing lambda probe -G130- and lamb-
da control downstream of catalytic con-
verter
Only engines with engine identification charac-
ters AQY, AZH, AZJ
Special tools, test and measuring equipment and
auxiliary items required
Handheld multimeter, e.g. -V.A.G 1526 A oder B-
Measuring tool set, e.g. -V.A.G 1594 A, B oder C-
Test conditions
•
Fuse 43 must be o.k.
•
Battery voltage at least 11.5 V.
•
The fuel pump relay must be OK.
•
Coolant temperature at least 80°C
block 004, display field 3
Test sequence
–
Check display groups 030, 031, 036, 037 and 041
Chapter 01-6.
If the specified values are not reached:
–
Test resistance of heating element between the con-
tacts 1 + 2, voltage supply for heater and cables to
-Z29- Current Flow Diagrams, Electrical Fault Find-
ing and Fitting Locations.
Note
At ambient temperature the resistance of the heating ele-
ment should be approx. 1...5 . The resistance increases
considerably even if the temperature rises only slightly.
If the specified resistance is reached and voltage supply
and cables to -Z29- are o.k.
–
Use handheld multimeter to measure voltage between
the contacts 3 and 4 of connector at the wiring loom.
–
Start engine.
Specified value: 0.40...0.50 V
–
Switch off ignition.
If the specified value is reached:
–
Replace lambda probe after catalyst -G130-.
If the specified value is not reached:
–
Test cables to lambda probe -G130-
Diagrams, Electrical Fault Finding and Fitting Loca-
tions.
If the cable is not found to be faulty:
24-3 4
page
OCTAVIA 1997
measured value
Chapter 01-5.
Current Flow
Check for proper operation
2,0 l/85 kW Engine, Fuel Injection and Ignition System
1 3
2 4
24 31
25 32
26 33
27 34
28 35
29 36
30 37
8
12 16 20
5 9
13 17 21
6
10 14 18 22
7
15 19 23
11
38
39
40
41
42
43
44
S97-0319
4 1
M24-0013
Edition 01.04
S00.5128.53.20