Checking Oil Pressure Warning Device (Buzzer)
How the device should work
Test Sequence From 8/81 ->
a) Engine not running – switch ignition on
—– LED must flash for about 3 seconds, buzzer should not sound
b) Engine running
Pull wire (0.5 blue/black) off oil pressure switch and increase engine speed to about 2000 rpm
—– LED must flash and buzzer sound
Test Sequence Model year 83
a) Engine not running – switch ignition on
—– LED must flash, buzzer* must not sound
b) Engine Running - Speed below 2000 rpm
Pull wire (0.5 yellow) off 0.3 bar oil pressure switch and earth it on vehicle
—–LED must flash, buzzer* must not sound
c) Engine Running – Speed above 2000 rpm
Pull wire (0.5 blue/black) off 1.8 bar oil pressure switch (but do NOT earth)
—–LED must flash, buzzer* must sound
* – On some vehicles (first ones produced) the control unit is so designed that in the lower speed range – oil pressure still below 0.3 bar – the buzzer sounds.
Test Sequence from 8/83->
a) Engine not running – switch ignition on
—– LED must flash, buzzer must not sound
b) Engine Running - Speed below 2000 rpm
Pull wire (0.5 blue/black) off 0.3 bar oil pressure switch and earth it on vehicle
—–LED must flash, buzzer must not sound
c) Engine Running – Speed above 2000 rpm
Pull wire (0.5 yellow) off 1.8 bar oil pressure switch (but do NOT earth)
—–LED must flash, buzzer must sound
* – On some vehicles (first ones produced) the control unit is so designed that in the lower speed range – oil pressure still below 0.3 bar – the buzzer sounds.