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Re: Further Re: Board computer

"Smith, Kirby A" wrote:

> Paul Nicholson <paul@eisusa.com> wrote to Keith Arthur:
> At 10:08 PM -0500 11/30/99, keith arthur wrote:
> >Hi everyone.
> >I just got my hands on my Mothers-soon to be mine- 1991 90.  I need help
> >with the trip computer.  The average speed, time and miles to empty all
> >work fine. but the instantanious fuel consumption, average fuel
> >consumption both read 200. and the g->  always reads 0.0  what do i need
> >to do get these working again.  If i reset the average fuel consumption
> >it goes to 0.0 but as soon as i drive for any distance it goes 200.
> >thanks in advance
> >keith
> It sounds like it's not getting information on the fuel consumption. My
> guess, and it's only a guess, is that the ECU computes the fuel consumption
> based on the injector commands, and somehow sends this to the trip computer.
> Is the trip computer a separate system? If so, look for the communication
> link between the two and verify the wiring.

I thought it measure manifold vacuum...
Thats totally my guess though too