89 200q oil pressure warning flashing on display

[Bernard Littau]

Hi Lino,

I have no BTDT on the oil pressure system, however...

It sounds like the oil pressure sender is out of spec.  Why don't you
disconnect it so it appears to the auto-check system as having infinite
resistance, and see what happens when you do you test.

You can also use some resistors across the connector to fake any reading you
wish.  You might try sending a known good signal, and a known bad signal,
and see what happens during your tests.

Best,

Bernard Littau
Woodinville, WA
'88 5ktq

> I'm in the process of debugging an oil pressure warning light that won't
> give up.
[snip]
> But what bothers, me and I'm hoping somebody can explain, is why does the
> oil pressure warning display goes off when I test it with the engine off,
> ignition on and pushing the test button?  The display starts going through
> its cycle and then gets stuck flashing the oil can.  What does that mean?
> The owners manual never mentions what to do if this happens during this
> operation.
> I suspect that there is more to this than just the pressure
> switch. Would a
> bad relay cause this?  Any BTDT?