[Gmecm] Scan Tool and Olds ECM in '89 Electra Estate

[Joe Vitek]

Actually, with the Olds 307s of this vintage, the E-Qjet is notorious for
developing an intermittent TPS. If this is all original, I would replace that
first. The other post about connectors etc. is valid too. If the ground wire of
the TPS connection becomes intermittent, the output will intermittently go to
rail (5V in this case). I would replace the TPS and check and clean the TPS
connector.

As far as the scantool modes, I am not sure. I have an OTC2000 also, but have
not tried anything you suggest.

I hope the above helps out...

--
joe vitek
(back in Olds lurk mode)

> Hi:
> 
> I have an '89 Electra Estate with Olds 307 V8, eQJet.  Everything is stock.
> 
> What I want to do is drive around with my scan tool plugged in for a few
> days to see if I can catch an intermittent code 21.  Vehicle is usually
> fine, but throwing code 21 "TPS High" every so often while idling at lights.
>   TPS voltage looks to be within specs at idle when checked.  So this is
> truly an intermittent--and for more amusement, the car has been fine all
> summer, but seems to start its little antics as soon as the weather gets
> cool.
> 
> My scan tool (OTC 2000) allows State 6, Field Service, and State 8, ALCL.  I
> understand that I should not run the engine in Field Service for more than 2
> minutes due to risk of overheating the catalytic--A.I.R. divert--per OTC
> manual.
> 
> Can I road test in State 8?  The OTC manual says the vehicle SHOULD NOT be
> driven in this mode due to increased Idle Speed and extra spark advance (on
> fuel injected ... meaning not applicable to this vehicle?).  "State 9 Road
> Test" is not available with this ECM.
> 
> Anybody have input on this?
> 
> Thanks.
> 
> Dante McLean
> dante.mclean at sympatico.ca
> 
> 1989 Electra Estate with about 175,000 orig. kms.