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Removing and installing Lambda probe > < Checking lambda probe heating

A4 Mk1

Motronic Injection and Ignition System (4 cyl.)>06.96
Checking lambda control
Testing lambda probe signal wiring and activation
  • ‒ Interrogate fault memory =>Page 01-8 (The lambda probe signal is monitored by the self-diagnosis function.)
  • ‒ If a fault in the lambda probe has been registered and the lambda probe heating is OK, unplug the lambda probe connector.
 
A24-0013
  • ‒ → Test voltage by connecting hand held multimeter V.A.G 1526 (measuring range 2 V) between contacts 3 and 4 of connector on wiring harness.
  • ‒ Switch ignition on.
    Specified value: 450 ±50 mV.
  • ‒ If the specified value is not achieved, connect test box V.A.G 1598/19 to the wiring harness for Motronic control unit -J220.
 
24-1193
  • ‒ → Test the following wiring connections for open circuit or short to positive or ground and repair as necessary:

Connector on wiring harness, contact

Test box V.A.G 1598/19 or -J220

3

A10

4

A11
  • ‒ If the wiring is OK, replace the Motronic control unit -J220.

Removing and installing Lambda probe > < Checking lambda probe heating