RPM counter test - Motor failure message

[susnye]

Hello,

when I perform an RPM counter actuator test, then the RPM counter jumps three times (as I remember to 1000rpm, 2000rpm and 5000rpm). I suppose it's OK.
But after jumping to 2000rpm or to 5000rpm on the dashboard the "Oil pressure low. Go to dealer." message appears.
After the test is done the message disappears.

Why does this happen?

Car info:

Alfa Romeo 156 '02 2.5 V6 24V
Bosch Motronic ME 3.1 EOBD (3.0 V6)
ECU ISO Code: 7C 86 13 80 EA

Thanks in advance!

[susnye]

so...? no idea?