[Fwd: Scanner Interpretation]

[steve ravet]

Got a question from a WWW browser.  He's not a list member, so please
reply privately to Royal_Uhlman at fmso.navy.mil (Royal Uhlman)

--steve

Royal Uhlman wrote:
> 
>  Please post this message to the diy_efi archive page. I've referred
>  to the archives numerous times but this is the first time
>  I've written. I have an Auto Xray XP240 scan tool I recently used to
>  analyze driveability problems of an 89 Olds 3.3 (3300. Everything was
>  normal with the exception of two parameters- POWER STEERING PRESSURE
>  HIGH- YES and ENGINE TEMPERATURE LIGHT- ON. The high press.
>  indication exists with switch connected or disconnected. Coolant
>  temperature (via coolant temp switch) indicated 196 F and the idiot
>  light was off. I understand that with the first problem I could have
>  a short to ground causing the ECM to see the steering wheel is being
>  moved (high press.). My question is, can the ECM be shorted
>  internally and generate these obviously erroneous conditions? The
>  problems I was investigating were rough idle (but steady) and slight
>  hesitation off idle. I'm concerned that the problems exist because
>  the ECM is "seeing" that the steering wheel is constantly being
>  turned while the engine is overheated, and it's attempting to
>  compensate with fuel and idle corrections. Any input would be
>  appreciated!
> 
>  Royal
> 
>  P.S. The ECM had been replaced once before, for, among other things,
>  the inability to enter diagnostic mode and a no-start condition.

-- 
Steve Ravet
steve.ravet at arm.com
Advanced Risc Machines, Inc.
www.arm.com