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Trip computer problem



Hi !

I have a problem with the trip computer (1991 200TQ 20V).
It canno't show the fuel consumption or the MPG at all.
It only shows 2000km, when the tank is full and flashes L,
when the tank is almost empty.  After reset, it shows
the average speed almost right. It also shows the
boost pressure correct. I've checked the wirings from
ECU to trip computer (one wire for fuel consumption(pin 32)
and another for engine speed(pin 6) ). I have also
replaced the trip computer circuit board. Please,
help me with my problem.

Regards

S.Räsänen