ignition AUDI A4 1997 B5 / 1.G AEB ATW Engines Lubrication System Components Workshop Manual

17-22

Oil pressure and oil pressure switch,
checking


Function of dynamic oil pressure warning
system

Warning lamp, checking
With engine switched off and ignition on (terminal
15 on), oil pressure warning lamp will be lit (not
for vehicles with Auto Check system).

Warning criteria

Engine switched off and oil pressure switch
closed.
Coolant temperature less than 60 C (140
F), engine speed higher than 300 RPM and
oil pressure switch open.

Coolant temperature greater than 60 C
(140 F).

At engine speeds greater than 5000 RPM,
an active oil warning won't be erased
independent of oil pressure switch setting.
A Diagnostic Trouble Code (DTC) is
recognized when oil pressure switch is open
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Special tools and equipment

VAG1342 oil pressure tester
VAG1527B voltage tester
VAG1594A measuring appliance adapter

Test conditions
Oil level OK
Oil pressure warning light -K3- must light up
when ignition is switched on.
For vehicles with Auto Check system, "i.O"
indicator must be lit (call up symbol)
Engine oil temperature approximately 80 C
(176 F)
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