Re: P0748 Solenoid Pressure Regulation - Saab 9-5 Bulletin Board - Saabnet.com
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Re: P0748 Solenoid Pressure Regulation
Posted by TimT [Email] (more from TimT) on Wed, 3 Nov 2021 16:33:30
In Reply to: Re: P0748 Solenoid Pressure Regulation, SWEDECAR [Profile/Gallery]
, Wed, 3 Nov 2021 13:45:24
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Thanks again.
And to make things more interesting, just now everything looked fine until the trans temperature reached 89 degrees F (we had the coldest day of the season) at which point P0748 appeared, solenoid valves SLT, SLU and SLS all went INACTIVE (Limp mode) on Tech 2 and the SLT waveform on oscilloscope went from a low duty cycle PWM to nothing (had started out at about 60% duty cycle on start then went down over the next few minutes.
So starting to sound like a circuit board issue (the TCM would be warming up as well), and a chance is being taking on getting a TCM from a 2004 in a few days and seeing if it can be adapted well enough to get me to work and back. I'll report back on outcome, as well as any other observations. With parts getting hard to find we may end up having to become electrical engineers to keep these cars going.
tim
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