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Check lambda probe and lambda control upstream of catalytic converter (engines with identification characters AQV, ATZ, AQW, AZF > < Lambda control

Fabia Mk1

Check lambda probe and lambda control (engines with identification characters ARV, AME, AZE)
Check lambda probe and lambda control (engines with identification characters ARV, AME, AZE)
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552 -
t  Diagnostic cable -V.A.G 1551/3, 3A, 3B oder 3C-
t  Hand multimeter (e.g. -V.A.G 1526 A-)
t  Adapter cable set (e.g. -V.A.G 1594 A-)
Test conditions
l  Fuel pump relay o.k., test → Chapter
   
l  Fuse no. 9 o.k.
l  Coolant temperature minimum 80 °C
l  No leaks in exhaust system between catalytic converter and cylinder head
Check for proper operation
–  Check display groups 030, 031, 032 and 033 → Chapter or generate readiness code → Chapter.
If the specified value is not reached:
–  Conduct a test drive in order to eliminate any residues on the lambda probe and repeat the test.
If the specification is also not shown in the display field after a test drive:
Testing heater
–  Disconnect the 4-pin plug connector from the lambda probe -G39-.
  S01-0094
–  Perform an electrical continuity test (resistance measurement) using the handheld multimeter between contacts 1 and 2 of the connector.
  Note
At ambient temperature (approx. 20 °C) the heating element resistance is of approx. 1 to 5 Ω. The resistance increases considerably even if the temperature rises only slightly.
–  If there is an open circuit, replace the lambda probe -G39-.
If the heating element has continuity, test voltage supply for lambda probe heater -Z19- → Current Flow Diagrams, Fault Finding and Fitting Locations.
Test basic voltage
  S24-0385
–  Disconnect the 4-pin plug connector from the lambda probe.
–  Connect handheld multimeter for voltage measurement to contacts 3 + 4.
–  Switch on ignition.
Specified value: 0.40 to 0.50 V
–  Switch off ignition.
If the specified value is not reached:
–  Test cable of lambda probe before catalytic converter → Current Flow Diagrams, Fault Finding and Fitting Locations.
If the specified value is reached:
–  Replace lambda probe → 1.0/37; 1.4/44; 1.4/50 Engine - Mechanical Components; Rep. Gr.26.
  S24-0384

Check lambda probe and lambda control upstream of catalytic converter (engines with identification characters AQV, ATZ, AQW, AZF > < Lambda control