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Old 08-27-2005, 11:42 PM   #1 (permalink)
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OBD2 plug location and Scan Gauge computer

I'm planning on getting a Scan Gauge computer. I looked under the driver side dash and haven't located the OBD2 plug? Anyone know where it's hiding?

Anyone using the Scan Gauge?

http://www.scangauge.com/
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Old 08-28-2005, 12:50 PM   #2 (permalink)
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I found it, must have been so close to my eye that I couldn't focus. It's just to the left of the clutch with a black cover that says obd II. Spotted it while investigating the short throw clutch mod.
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Old 08-28-2005, 07:36 PM   #3 (permalink)
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I have always wanted one of these things. Where were you going to put the guage itself? I can't figure out the best position.
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Old 08-28-2005, 08:44 PM   #4 (permalink)
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what is the purpose of this gauge you speak of?
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Old 08-28-2005, 09:53 PM   #5 (permalink)
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Quote:
Originally Posted by Bluzman
what is the purpose of this gauge you speak of?
Click on the website provided.

It has real time MPG as well as trip MPG, daily MPG, and tank MPG which I'm interested in using for comparisons like with a/c and without, mpg at different speeds and with different gears etc. As tall as the gears are I'm wondering if cruising at 50 in 4th is better than 50 in 5th etc.

It also shows voltage, coolant temperature, intake air temperature. manifold pressure, gas/miles left before empty and other cool geeky stuff.

It also shows "check engine" codes and you can reset them.

It looks like it will fit in the pocket right in front of the shifter on 5-speed consoles anyway. I may try to locate it on the dash to the left? I ordered it today, I'll know more soon.
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Old 09-06-2005, 10:14 PM   #6 (permalink)
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Brief update, I can't yet trust direct results from the scangauge but I'm gaining respect.

First I've calibrated the odometer, and until I do a long trip I think the odometer is 1% low with the taco reading 20 miles to the mile marker reading 19.8. The Scanguage allows adjustments by 1% and that seemed to take up the slack though I'm not convinced that individual interstate mile markers are really that precise, over the 20 miles there was some variation.

Second, the mph is off by more than a bit, at a solid 62 by the scanguage, (using the same odometer adjustment) the taco gauge is reading 65-6. If people are passing you at 65 there's a reason. Of course with at least 6 different rear gear/tranny/tire combos, your combo may vary, odometer as well of course.

3rd, even with the above factors I'm getting a per trip mpg of 32-34 mpg on my daily commute with the 2.7l of 9 miles mostly 45 and 55 with a few stoplights. This jives with the 29.5 mpg from my first tank, I'm hoping to improve on this my 3rd tank.

My gas usage is just a sensor estimate until I cailbrate with a few tankfuls. On my first fill up since getting the scangauge I'll indicate FILLUP, and then at the next fillup it will tell me what it estimated I used, and I'll correct it if necessary with actual fill volume, and it will establish an error. On subsequent fillups i'll refine this error or conclude it isn't accurate? So far it seems reasonable.

Initial conclusion, driving habits have a HUGE effect on overall mpg. I have 8 stoplights to and from work. If I look ahead and anticipate stops and coast to stops, or never stop I can increase mpg from an oblivious 22mpg to a conscious 34mpg without getting to work any faster. I see a lot of people racing past me as I watch the scangauge mpg climb only to catch up or pass them at the next intersection.

I'm getting anal quickly, but if you want better mpg, it can be had, if you don't care how your "intake" sounds.
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Old 09-07-2005, 07:23 PM   #7 (permalink)
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what truck do you have? it's hard for me to believe that you are getting 29.5 mpg per tank.
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Old 09-07-2005, 08:25 PM   #8 (permalink)
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Quote:
Originally Posted by coloradotaco
what truck do you have? it's hard for me to believe that you are getting 29.5 mpg per tank.
Tacoma 4x2 access cab, 2.7l 5-spd.

1st tank 518 miles 17.54 gallons, 29.5 mpg
2nd tank 483 miles 17.97 gallons, 26.9 mpg
3rd tank is 410 miles with hair under 1/4 to go.

If my 1% odometer error is correct its 29.2 and 26.6 instead.

Last edited by worthywads; 09-07-2005 at 08:28 PM.
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Old 09-08-2005, 02:58 PM   #9 (permalink)
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oh.. no wonder. i have the 4X4 TRD V6.. very different situation not bad at all what you are getting. i require 4 wheel drive and burliness, however.. say hi to boulder for me. went to CU.
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Old 10-15-2005, 11:49 AM   #10 (permalink)
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Is there another way to reset the check engine light without the use of a scan guage or hauling it off to the dealer?
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Old 10-15-2005, 04:14 PM   #11 (permalink)
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yes, from page 150 of my owner's manual

1. Turn the ignition key to the “OFF” position
with the odometer reading shown.
(For details, see “Odometer and two
trip meters” on page 143 in this Section.)
2. Turn the ignition key to the “ON” position
while holding down the trip meter
reset knob.
Hold down the knob for at least 5
seconds. The odometer indicates “000000”
and the light goes off.
If the system fails to reset, the light will
continue flashing.

Oops, that's for the "Maintenance Required" light. If it's really the "check engine" light you are talking about, then it needs to be reset with a scan tool as far as I know. Though I believe some codes will reset themselves after a period of time and the light would go off by itself if the fault does not occur again.

Last edited by Walters; 10-15-2005 at 04:32 PM.
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Old 10-15-2005, 04:26 PM   #12 (permalink)
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Quote:
Originally Posted by worthywads
First I've calibrated the odometer, and until I do a long trip I think the odometer is 1% low with the taco reading 20 miles to the mile marker reading 19.8. The Scanguage allows adjustments by 1% and that seemed to take up the slack though I'm not convinced that individual interstate mile markers are really that precise, over the 20 miles there was some variation.

Second, the mph is off by more than a bit, at a solid 62 by the scanguage, (using the same odometer adjustment) the taco gauge is reading 65-6. If people are passing you at 65 there's a reason. Of course with at least 6 different rear gear/tranny/tire combos, your combo may vary, odometer as well of course.
Worthywads -- I hadn't seen this thread, so now that it's resurfaced, I'll comment. I checked my odometer against mile posts for 20 miles just like you did, and at milepost 20 I was reading 20.1 for an error of .5 percent, not worth adjusting for. On the speedo I noticed an error similar to your results. When I go past a radar sign at 45 the sign will read about 42 or so. I can live with that. Is the adjustment for the odometer only, or can the speedo also be adjusted? It's really the odo that's more important to me, so I'm happy the way it is. It's interesting that we got identical results. I have an Prerunner V6 Access Cab, auto trans. SR5, not TRD.

As for the Scangauge -- God, it looks like a 7th grade science project. Someone needs to redesign the looks of this thing before I'd allow it in my truck!

Last edited by Walters; 10-15-2005 at 04:29 PM.
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Old 10-15-2005, 05:04 PM   #13 (permalink)
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Quote:
Originally Posted by Walters
Worthywads -- I hadn't seen this thread, so now that it's resurfaced, I'll comment. I checked my odometer against mile posts for 20 miles just like you did, and at milepost 20 I was reading 20.1 for an error of .5 percent, not worth adjusting for. On the speedo I noticed an error similar to your results. When I go past a radar sign at 45 the sign will read about 42 or so. I can live with that. Is the adjustment for the odometer only, or can the speedo also be adjusted? It's really the odo that's more important to me, so I'm happy the way it is. It's interesting that we got identical results. I have an Prerunner V6 Access Cab, auto trans. SR5, not TRD.

As for the Scangauge -- God, it looks like a 7th grade science project. Someone needs to redesign the looks of this thing before I'd allow it in my truck!
I ended up finding a 2% odometer error after more travel. On the Scan guage the odometer and speedometer are directly related, if the odometer is accurate so is the mph. The Tacoma speedo and odo don't seem to match though. The odometer on mine with different tires and gearing as yours is off by 2% but the adjusted scan guage reading 61mph compared to dash 65 or around 6% off?

As for the looks, yes it's rather cheesey and could be half the thickness, but it's overall small, I have it positioned on the dash to the far left with the wire running down the dash, I could run it down so that it's sandwiched between the dash and the door but haven't bothered.

Another update, I filled up and ended up adjusting the fuel consumption reading by 7%. I actually used 19.5 gallons but the scan guage only thought I'd used 18.2. Now the fuel consumption is adjusted and should be accurate, I'll see with the next tank.
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Old 10-15-2005, 07:53 PM   #14 (permalink)
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Quote:
Originally Posted by AusTXTaco
Is there another way to reset the check engine light without the use of a scan guage or hauling it off to the dealer?
Per the service manual..........you can disconnect the negative battery cable for one minute.
This will clear the code, but will also clear the radio settings and the clock.

Last edited by ron46; 10-15-2005 at 07:55 PM.
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Old 10-17-2005, 11:11 AM   #15 (permalink)
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can you post some pics of where and how you mounted it?
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