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Test of ageing of lambda probe upstream of catalytic converter G39 > < Test conditions

Octavia Mk1

Test sequence
Test sequence
Check the function of the lambda probe -G130 - and of the lambda control downstream of the catalytic converter using the function “Read measured value block, display groups 030, 036 and 041” → Chapter 01-6.
If the specified values are not reached:
–  Switch off ignition.
–  Disconnect the 4-pin plug connector from the lambda probe -G130 -.
   
–  Use handheld multimeter to measure the resistance between contacts 1 and 2 of the plug.
  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 interruption, replace the lambda probe after catalyst -G130-.
–  Check the supply voltage or lines to the lambda probe heating downstream of the catalytic converter -Z19- according to the current diagram.
If the resistance and the supply voltage are OK:
  N24-0955
–  Connect the hand-held multimeter for voltage measurement to contacts 3 + 4 of the plug -2-.
–  Start engine and measure supply voltage.
t  Specified value: 0.40...0.50 V
–  Switch off ignition.
If the specified value is reached:
–  Replace the lambda probe downstream of the catalytic converter -G130- → 1.6 l/75 kW Engine, Mechanical Components; Rep. Gr.26.
If the specified value is not reached:
–  Test wiring and plug connections according to current flow diagram.
If no fault was found:
–  Replace engine control unit → Chapter 24-6.
  S24-0463

Test of ageing of lambda probe upstream of catalytic converter G39 > < Test conditions