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Any Open Source Solutions For DIY Auto Diagnostics?
slaxx writes "As an avid tinkerer, I really want to collect as much data about my car as possible. Using On-Board Diagnostics (OBDII) sounded great to me, but the pricetags of systems like AutoTap Scanner are a bit much for my college budget to handle. Are there any free, open source solutions available? What do Slashdotters do to tinker and record the inner workings of their own vehicles?"
As an Engineer who owns and "tinkers" with many of my own cars I'd hardly consider OBDII a "safety critical system". in general it's designed to just be an output, it does accept inputs as well but unless you know what you're doing it's next to impossible to make detrimental changes to the programming.
If you're really all that concerned about making really STUPID mistakes it why not only tap into the outbound serial pin and then throw an opto-isolator on it. then you can do whatever the hell you want and not worry about damaging your engine computer.
to the OP... there are DOZENS of OBDII to Serial port adapters on eBay that sell for ~$30, I own several. You'd be hard pressed to build your own for cheaper, the hardware alone will likely cost you that much. There are dozens of free and or cheap (freediag. If you'd rather write your own SAE and ISO control the OBDII standard.
Any engineer who is too frightened to even perform some basic research on the workings of something as simple as OBDII should be ashamed of themselves.
Collector's Edition
That's all well and dandy except that the scan equipment isn't actually expensive, the OP is simply looking in the wrong places. You can order a self-contained, portable hand scanner from Jegs or Summit (without question the de-facto shade-tree-mechanic parts and tools catalogs) for about $40, you don't even need a "fancy computer" to interface with it, just the multi-meter sized device in your hand.
And the real reason the Mechanics hate doing warranty work is because the dealership screws them over too. They get paid by the job based on the complexity, and the dealership considers the same job covered under warranty to be worth about half as much. I've got several friends who make their living as auto mechanics.
It's not different to the sales department who make their money only on commission as a percentage of the profits over invoice, so to screw over the sales people the dealership sell at barely above invoice and make their money on the financing/extended warranty/accessories/etc. I've got several relatives who make their living as auto salesmen.
Dealerships will stop being scummy when they stop treating their employees like starving dogs.
Collector's Edition
I just found and bought torque the other day. Great piece of software. I've had an OBDkey for a while, and had an old palm PDA mounted in the car to run the OBD reading software. Now with Torque, I was able to ditch the palm and just use my android phone. I eventually want to play with the OBD protocol and see just what I can get my car to do or not do.