[Fwd: New member needs help]

David A. Cooley n5xmt at bellsouth.net
Thu Nov 19 17:29:01 GMT 1998


This is from what I have seen on the 84-87 Buick Grand Nationals...  Looking
at the cal for the 85 shows a limit for TPS high and TPS low errors...
Several other parameters have to be met to turn the check engine light on
and set the code, but coming out of closed loop may be part of the error
(The computer assumes the sensor is shorted and goes open loop with fixed
fuel/timing etc)

-----Original Message-----
From: J Norris <jwn at sgi.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, November 19, 1998 11:38 AM
Subject: Re: [Fwd: New member needs help]


>Very interesting David.  How do you know this?  This seems to be exactly
what my
>car is doing.  The GM service manual says nothing of a high voltage.  Do
you
>know where you read this?
>
>Jason Norris
>
>David A. Cooley wrote:
>
>> At 10:18 AM 11/14/98 +1100, you wrote:
>> >>
>> >Doesn't ECU read high tps as large throttle opening and richen up
>> >accordingly?
>> >I don't understand
>>
>> It does to a point, but it also has a certain level that it uses to
>> determine if the TPS is shorted or open... Depending on the car, Usually
it
>> goes to about 4.6-4.7V as normal operation... above that it thinks the
>> wiring or the TPS is shorted.
>> Later,
>> DAve
>>
>> ===========================================================
>>            David Cooley N5XMT           Internet: N5XMT at bellsouth.net
>>      Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
>>        I am Pentium of Borg...division is futile...you will be
approximated.
>> ===========================================================
>
>




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