STS Scott Posted April 23, 2005 Report Share Posted April 23, 2005 Based on the tuitorial "93-95 OBD I Diagnostic Codes from Tony Haukap" in the FAQ section, I know the STS can tell me what grade of fuel it is running. Can our DTS do the same, and how would I go about retrieving the info? I ask because my Dad filled his car up at work, and someone told him it was premium grade, and we just wanted to check. Thanks! " ...'took my Cobra down t' the track, hitched to the back o' my Cadillac..." - Jan & Dean, 'hey little cobra' Scott Link to comment Share on other sites More sharing options...
Vince P Posted April 23, 2005 Report Share Posted April 23, 2005 STS Scott Here is the process: 1. Get into the diagnostic mode------------Press OFF and WARMER at the same time 2. The the system go through the diagnostics 3. The system will end on PCM-------------Press the FAN UP ARROW 4. The first area is data----------------------Press the UP ARROW 5. Keep pressing the UP ARROW until you get ot ---PD-42 6. Read the Octane---It will read O or 87 or 90 or 93. You can figure how to get out of the diagnostic mode. Vince P Link to comment Share on other sites More sharing options...
CaddyChris Posted April 24, 2005 Report Share Posted April 24, 2005 Guru, I hear what you are saying, I can understand why it would take a longer time to update the tables and even why they are probably not that precise all the time. I thought this was interesting and when I went out to my car on friday I went into the diagnostics and scrolled to PD 42. I was delighted to see that it said "87" haha which is the type of gas i've always put into the sts. Anyhow, I thought it was pretty neat. Chris Christopher Petro 94 sts 67 coupe de Ville Link to comment Share on other sites More sharing options...
STYES Posted April 25, 2005 Report Share Posted April 25, 2005 The octane tables Guru describes are used by the driveability techs to determine the spark advance that the PCM is operating with. Carbon build up is going to have a major impact on this. WOT's folks! WOT's! Link to comment Share on other sites More sharing options...
sprucegoose Posted April 25, 2005 Report Share Posted April 25, 2005 Hmmm... I tried this this morning, just out of curiousity. My data on PD42 was 0, so what exactly dos that mean? I just fueled up with 89 octane mid-grade yesterday, and that's all I ever run (unless I'm heading for the strip that is! ) I'm thinking it either means it can't get an accurate reading, or it has defaulted to a mode where there is no spark compensation?? '09 Cadillac CTS-4 3.6 direct injection, 128 K mi. '15 Chevy Tahoe LTZ, 5.3i V8, 125 K mi '70 Firebird Formula 400, Bored+.04, RAIII heads, M21 4spd., in-process restoration! Link to comment Share on other sites More sharing options...
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