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Re: Why a computer in cluster (was: Gremlins in Tank)
- Subject: Re: Why a computer in cluster (was: Gremlins in Tank)
- From: SMILLER@xxxxxxxxxxxxxx
- Date: 24 Sep 98 10:25:06 PDT
John, that is interesting, educated speculation, and sounds plausible. So
if fuel gauge circuits need to be so complicated now, for the reasons
you mention, I'm just curious: Do other makes of cars have similar
circuits and problems?
Scott Miller
GGC BMW CCA #44977
>Date: Wed, 23 Sep 1998 21:47:05 +0200 (MEST)
>From: John Firestone <[email protected]>
>Subject: Why a computer in cluster (was: Gremlins in Tank)
>
>Scott Miller writes:
>>
>> New BMW gas gauge: Sender in tank, wires to computer, wires from
>> computer, gauge in dash.
>>
>> Question: Why does the gas gauge need a computer?
>
>Several reasons I expect:
>
> - to detect faults in the fuel sender signal (shorts to ground, to +12,
> intermittent connections, faulty senders and nonsensical readings);
>
> - to pinpoint problems with the fuel gauge via the cluster system test;
>
> - to monitor the fuel senders via the workshop DIS computer;
>
> - to simplify the low fuel warning and make it more repeatable;
>
> - to simplify the OBC and insure its displayed RANGE is consistent
> with the instrument cluster;
>
> - to allow easy, software downloads to the cluster (coding data) that
> adjust for differences among models or changes over different
> model years (e.g. a different tank size).
>
>- -John
>'96 318is
>[email protected]
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