Does anyone have a list of manufacturer specific OBD2 PIDs for 1999 SL2?
I just got a Bluetooth scan tool, mostly so I could diagnose an extremely intermittent P0706 code, but to my disappointment, it appears that the sensor inputs used by the PCM to generate that code - namely the "transmission range sensor" - isn't one of the generic sensors.
So yeah, either I suck at googling or this information just isn't easy to find it the sea of garbage. |
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https://en.m.wikipedia.org/wiki/OBD-II_PIDs#Service_02 I'm definitely getting ahead of myself, having spent less than an hour learning about how OBD-II works, but I find it extremely unlikely GM/Saturn designed an entirely new system for transmission related diagnostics. There's gotta be a PID I can input into the app to be able to emulate the official (or whatever "Scan tool" means) tool's functionality and that's what I'm asking about. |
Originally Posted by Mr_Infamous
(Post 72546)
Yes, I know about that site. If you look at the transmission codes, e.g. P0706, you'll see something called a "Scan tool" mentioned.
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Kinda brutal, man.
People come here to learn. Someone trying to address OBD2 codes based on to-date little research, zero experience, and no guidance is someone who wants to learn. Wrong terminology used? Par for the course for a noob at anything. Spread your wisdom...... |
Originally Posted by grcauto8453
(Post 72547)
You don't know what a scan tool is? Take your car to a shop.
Interesting start here. |
Originally Posted by derf
(Post 72548)
Kinda brutal, man.
People come here to learn. Someone trying to address OBD2 codes based on to-date little research, zero experience, and no guidance is someone who wants to learn. Wrong terminology used? Par for the course for a noob at anything. Spread your wisdom...... For example, engine coolant temperature is PID #5, which returns a single byte (0-255). To compute the actual temperature, the app would be subtract 40 to get Celsius then if necessary convert that number (-40-215 °C) to °F. I'm asking about this because I don't see any transmission PIDs amongst the hundreds that come preprogrammed into the app, but I'm 99.999% sure someone knows how to configure the app to be able to see, e.g. the value of the "transmission range sensor", which is used by the PCM to calculate which of P, R, N, D, 3, or 2 is selected. By the way the specific Android app I've been using is called "Car Scanner ELM OBD2" (com.ovz.carscanner). |
I'm sorry that I can't help you with that, but if you ask around a few shops if they have an older "tech" who might be familiar with Saturns, maybe they could help. I don't know if any particular scanners on the market have what you're looking for since Saturn has become extinct.
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Originally Posted by Rubehayseed
(Post 72551)
I'm sorry that I can't help you with that, but if you ask around a few shops if they have an older "tech" who might be familiar with Saturns, maybe they could help. I don't know if any particular scanners on the market have what you're looking for since Saturn has become extinct.
Anyway I've been reading various posts around the Internet this morning and I found a thread with a partial list of PIDs for a 2008 Colorado, which includes parameters such as "current gear" and "transmission range", which are probably going to match the Saturn PIDs, since like I said, it would be stupid and pointless for GM to define multiple sets of PIDs. I'm beginning to think it was intended, back in the 1990s, that manufacturers would keep their PIDs secret and license them out to scan tool manufacturers at obscene markups. It's only been in the past couple of years that the cheap Bluetooth scanners have made it possible for nerds like me to have an interest in reverse engineering this stuff. The combination of the relative uselessness of the nonstandard parameters, Saturn being extinct for 15 years now, and the death of saturnfans.com, which afaik was by far the largest source of info on Saturns, means it's possible what I'm looking for simply doesn't exist yet. |
Supposedly there was one guy. One. Who was able to crack the communications mask on the PCM and I believe read exactly what you're looking for. The AH posted screens showing such data. They also never shared a ****ing thing with anyone.
Saturn was quite standalone when it came to design. Very little overlap in parts in the beginning with the s series cars and the rest of GM. This is evidenced by looking at the fitment of pretty much any Saturn part on an s series or l series car. Ion and cobalt were much closer. But in the beginning it was essentially a one-off design. For whatever reason, GM locked down the s series PCMs. That's why nobody knows what is stored where. No one can get in to map it. For the record, my post was not directed towards you. It was directed at the person who posted after you. I didn't open the charm thing but Saturn text used GM tech 2 devices at the dealership. Much more broadly functional than what's available today to support a Saturn in troubleshooting and other functions. I wonder if you used a tech 2 if it would access all of the PIDs, thereby providing you with a map of all of them.... I've been wanting to buy one with an OBD1 adapter for my '95 coupe but I just haven't pulled the trigger. |
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