warning AUDI A4 1998 B5 / 1.G AFC Engine Lubrication System Components Workshop Manual

17-7


7 -
Pressure relief valve 11 bar
New
8 -
Oil pick-up New
9 -
Oil pressure switch 1.8 bar Color: BrownChecking page 17
-9
Dynamic oil pressure warning system
function page 17
-11

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17-9

Oil pressure and oil pressure switch,
checking

Operational test and servicing the visible and
audible oil pressure indicator:

Electrical Wiring Diagrams, Troubleshooting
Component Locations binder.

Test requirements

Oil level OK
Oil pressure warning light -K3- comes on
with ignition on
Auto-Check system indication OK, if
applicable.
Engine oil temperature approx. 80 C (176
F) and radiator coolant fan must have
switched on at least once

Checking oil pressure switch

- Disconnect harness connector from oil pressure
switch.
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17-11

Operation of dynamic oil pressure
warning system, checking

Testing oil pressure warning light:
After ignition is switched on (terminal 15 on) with
the engine not running, the oil pressure warning
light flashes (not on models with Auto Check
System).
Warning criteria:

Engine not running; oil pressure switch
closed
Engine coolant temperature greater than 60 C
(140 F), engine speed greater than 1500 RPM
and oil pressure switch open

Engine coolant temperature less than 60 C
(140 F), engine speed greater than 300 RPM
and oil pressure switch open

At an engine speed greater than 5000 rpm, an
active oil warning is not cancelled, irrespective
of the position of the oil pressure switch
If the voltage supply to the control module
(terminal 15) is in order and, when the engine is
running, the oil pressure switch is open for
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longer than 0.5sec. above 1500 RPM, this
event is stored. If this condition occurs three
times during "terminal 15 on," the warning also
becomes or remains active below 1300 RPM.
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