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Test lambda probe signal line and control > < Check lambda probe and lambda control

Octavia Mk1

Check lambda probe heater
Check lambda probe heater
Special tools and workshop equipment required
t  Test box -V.A.G 1598/22-
t  Hand-held multimeter e.g. -V.A.G 1526 A - or multimeter -V.A.G 1715-
t  Measuring tool set -V.A.G 1594 A -
t  Voltage tester, e.g. - V.A.G 1527-
t  Current flow diagram
Test conditions
   
l  Fuse no. 43 o.k.
Checking voltage supply
–  Check the 4-pin plug connection to lambda probe -G39-.
  S97-0319
–  Connect the multimeter for voltage measurement (resistance measurement) to the contacts 1 and 2 of the plug.
   Specified value 2.7 to 3 Ω.
  Note
The measurement must be carried out at room temperature. The resistance increases considerably even if the temperature rises only slightly.
–  Replace the lambda probe if an open circuit is detected.
If there is continuity in the heating element, check the voltage supply of the lambda probe heater as follows:
  S24-0184
–  Connect multimeter with the adapter cables to the contacts 1 and 2 of the plug to the wiring loom.
–  Start engine briefly.
Specified value: approx. battery voltage.
  S24-0248
–  If the specified value is not reached, connect the multimeter between contact 1 of the plug at the wiring loom and the vehicle mass.
–  Start engine.
Specified value: approx. battery voltage.
–  If the nominal value is not reached, test the wiring of contact 1 to fuse for open circuit or short-circuit to earth.
If fuse and wiring are o.k., check fuel pump relay → Chapter.
–  If the wire, fuse or relay are not found to be faulty, measure the resistance between contact 2 of the plug at the wiring loom and the vehicle mass.
Specified value: max. 1 Ω.
  S24-0248

Test lambda probe signal line and control > < Check lambda probe and lambda control