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Engine control unit > < Testing lambda probe ageing upstream of catalytic converter G39

Fabia Mk1

Testing lambda probe G130 and lambda control downstream of catalytic converter
Testing lambda probe -G130- and lambda control downstream of catalytic converter
Special tools and workshop equipment required
t  Handheld multimeter, e.g. -V.A.G 1526 A-
t  Adapter cable set, e.g. -V.A.G 1594 A-
Test conditions
   
l  Fuse 43 must be o.k.
l  Battery voltage at least 11.5 V.
l  The fuel pump relay must be o.k.
l  Coolant temperature at least 80 °C ⇒ read measured value block 004, display block 3 → Chapter.
Test sequence
–  Check display groups 030, 031, 036 and 037 → Chapter.
If the specified values are not reached:
–  Test resistance of heating element between contacts 1 + 2, voltage supply for heater and cables to -Z29-, as necessary.
  Note
At ambient temperature the resistance of the heating element should be approx. 1...5 Ω. The resistance increases considerably even if the temperature rises only slightly.
If the specified resistance and voltage supply and cables to -Z29- are o.k.
  S97-0319
–  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 downstream of catalytic converter -G130 -.
If the specified value is not reached:
–  Test cables to lambda probe -G130- → Current flow diagrams, Electrical fault finding and Fitting locations.
If the cable is not found to be faulty:
–  Replacing engine control unit → Chapter.
  A24-0094

Engine control unit > < Testing lambda probe ageing upstream of catalytic converter G39