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Author Topic: OBD codes at inspection time, no MIL  (Read 1449 times)

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Offline wheelbuilder_25

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OBD codes at inspection time, no MIL
« on: June 13, 2014, 11:53:55 AM »
So I dropped my car off for inspection this morning (2009 Legacy i) And I just got a call back, 2 OBD codes - P0600 and P1718, it won't pass.  I stop and picked her up, no Check Engine light, checked for codes with the ultra gauge, nothing.  Nothing pending either.  What the hell ?  I looked up the codes, the 600 claims comm link problems, and the other could be a speed sensor on the tranny.

Any ideas ?
09 Legacy iSE

Offline wheelbuilder_25

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Re: OBD codes at inspection time, no MIL
« Reply #1 on: June 13, 2014, 03:31:43 PM »
So I called the owner back,and we both came to the conclusion that running with the scangauge hooked up was the issue.  (the garage is only like 2 miles from my house)I took the car for a couple 10 mile drives without the scangauge and re-tested her. Pass,no problems.
Next time, I'll pull off the scangauge a couple days ahead to make sure it has some warmup cycles on it first.
09 Legacy iSE

Offline hydrochloric

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Re: OBD codes at inspection time, no MIL
« Reply #2 on: June 14, 2014, 01:20:35 AM »
That's very weird.  Assuming your CEL light is functioning, the only way I know of for a code to exist without triggering it is to be "pending".  I know on older cars that doesn't fail you, but maybe on newer ones it does.
-'00 BRP 2.5RS- rustbucket DD with SUPERCHARGED! junkyard engine  :D  -'66 VW Type III 1600 Squareback- Survivor, 42k miles  -'83 944- mostly-un-broken track car  -'50 Hudson Commodore 6 TSD rally car  -'93 Audi S4- New DD.  Eventually.

Offline wheelbuilder_25

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Re: OBD codes at inspection time, no MIL
« Reply #3 on: June 14, 2014, 09:56:42 AM »
Weird indeed.  The light appears to work, the code reader didn't see any pending or current codes, and the car hasn't thrown a code since I've had it.  Not that I know anything about it, but I thought there was a monitor in the ecu that could tell distance/miles since the last code clearing, and that inspection machines would read that to prevent you from clearing a code right before inspection, and before it could re-occur.

Either that, or the connecter is screwy.  Which is seeming more likely.
09 Legacy iSE

Offline hydrochloric

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Re: OBD codes at inspection time, no MIL
« Reply #4 on: June 16, 2014, 12:17:29 AM »
I know from personal experience there's no miles-since-reset counter (that the inspection computer cares about, anyway), but rather are monitors (EVAP, Catalyst, etc) that take a certain number of miles to complete, and depending on the car need to be passed to pass inspection.  That was how I slipped my thoroughly dead stock cats through for three years, because the cat monitor usually passes (or fails, in my case) last.  I would reset the ECU, drive until it was the only remaining monitor to pass, then get the inspection done.  Worked perfectly every time.  IIRC, <2006 MY could have 3 monitors incomplete and pass, 2006+ only one.
-'00 BRP 2.5RS- rustbucket DD with SUPERCHARGED! junkyard engine  :D  -'66 VW Type III 1600 Squareback- Survivor, 42k miles  -'83 944- mostly-un-broken track car  -'50 Hudson Commodore 6 TSD rally car  -'93 Audi S4- New DD.  Eventually.

Offline skyphix

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Re: OBD codes at inspection time, no MIL
« Reply #5 on: June 16, 2014, 07:56:59 AM »
My 2004 and my 1998 both failed for one monitor not ready after a reset.
Eric

Offline wheelbuilder_25

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Re: OBD codes at inspection time, no MIL
« Reply #6 on: June 16, 2014, 09:26:30 AM »
I'm digging in the manual for the scangauge, but I don't see anywhere that it resets readiness monitors, unless you tell it to clear a code.  I haven't cleared any codes on that car with it, so I'm at a loss about it's OK the second time thru.

Either way, next year, I'm pulling the gauge a week ahead.

Thanks everyone for the insight !
09 Legacy iSE

Offline hydrochloric

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Re: OBD codes at inspection time, no MIL
« Reply #7 on: June 17, 2014, 04:22:25 AM »
My 2004 and my 1998 both failed for one monitor not ready after a reset.



I passed that way for three years, and I know it's worked for two other people I told it to.  Do you mean you reset it and immediately tried inspection, or drove it some?  (Also, this was on the old computers, I think, but don't KNOW, the new ones have the same loophole.)
-'00 BRP 2.5RS- rustbucket DD with SUPERCHARGED! junkyard engine  :D  -'66 VW Type III 1600 Squareback- Survivor, 42k miles  -'83 944- mostly-un-broken track car  -'50 Hudson Commodore 6 TSD rally car  -'93 Audi S4- New DD.  Eventually.

Offline wheelbuilder_25

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Re: OBD codes at inspection time, no MIL
« Reply #8 on: June 17, 2014, 10:14:28 AM »
Where would be a good place for an OBD-II newb like me to start learning more ?
09 Legacy iSE
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