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Removing and installing Lambda probe >
< Checking lambda probe heating
A4 Mk1
Power unit
Motronic Injection and Ignition System (4 cyl.)
Mixture preparation system, electronic inj.,Gas
Checking Lambda control
Testing lambda probe signal wiring and activation
Motronic Injection and Ignition System (4 cyl.)
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.)
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If a fault in the lambda probe has been registered and the lambda probe heating is OK, unplug the lambda probe connector.
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→ 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.
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Switch ignition on.
Specified value: 450 ±50 mV.
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If the specified value is not achieved, connect test box V.A.G 1598/19 to the wiring harness for Motronic control unit -J220.
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→ 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.
Power unit
Motronic Injection and Ignition System (4 cyl.)
Mixture preparation system, electronic inj.,Gas
Checking Lambda control
Testing lambda probe signal wiring and activation
Removing and installing Lambda probe >
< Checking lambda probe heating