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Old 12-05-2013, 02:28 PM   #21
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you guys think my ultragauge could have had something to do with it?

when i first discovered it wouldnt start, i noticed the ultragauge's backlight was lit without the key in the ignition... so i unplugged it.. just went and tested it on my moms car and it doesn't work anymore

rip ultragauge.
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Old 12-06-2013, 07:14 AM   #22
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Could have. If it failed it could have broght down the comm circuits in your car. But things should have returned to normal shortly after unplugging it.
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Old 12-06-2013, 07:19 AM   #23
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Quote:
Originally Posted by MilzyZ34 View Post
sounds like BS to me. The DLC (Data Link Connector) has 4 wires going to it ... one 12v power wire, two grounds, and one serial data wire. Sometimes it also has a 5th green wire, but I've never seen one with a grey 5v reference wire for it.

Serial data communication wire should have an average of 2.5V (aprox) on it. It's a 5v circuit.
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Old 12-06-2013, 10:08 AM   #24
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I bet the thing went through a CASE relearn and that's what the problem was..... but what the heck do I know
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Old 12-06-2013, 12:41 PM   #25
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Could be right about voltage on the serial data line. I don't test that wire for voltage, just continuity, resistance, and short to ground. With the output on that wire being a stream of data from the pcm, I just don't think measuring the voltage is the best way to test that.

I think it's pretty hilarious that the dealership is clueless when they are the most expensive option, and also the option people assume would be the ultimate solution to their problem.
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Old 12-06-2013, 03:10 PM   #26
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Many times iv run into the situation where the problem is no longer present and there's just nothing I can do. I could just throw an SDM in a vehicle for a history problem... But then we become STealerships. Can't determine the problem and then were idiots. No matter what they only care when u screw up.
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