Author Topic: OBD II Code Reader Questions  (Read 24336 times)

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jimbo74

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OBD II Code Reader Questions
« on: May 19, 2014, 10:51:12 AM »
Having failed my smog test for OBD Readiness, I have some questions about code readers.

From what I have gathered, a reader capable of reading I/M would be able to tell me if each system was ready or not, correct?

Another question I had is this, if I erased a code with the reader, would that also reset the I/M as well?

I am looking at some readers that say this:

•Supports all OBD II protocols and the Controller Area Network (CAN) protocol
•Patented I/M Readiness Key for quick drive cycle verification and state emissions readiness check
•Retrieves generic codes (P0, P2, P3, U0), manufacturer codes (P1, P3, U1) and pending codes
•Resets Check Engine Light (MIL), clears codes and resets monitors
•Displays DTC definitions on the easy-to-read color screen
•Provides Code/Cause/Solution tips for easier troubleshooting
•Retrieves vehicle information (VIN, CIN and CVN)
:usa:

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BigMike

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Re: OBD II Code Reader Questions
« Reply #1 on: May 19, 2014, 01:30:36 PM »
I haven't looked at any modern scanners in a while, but my old scan tool from 2004 shows this screen...


...Is this is the Readiness tests you are referring to?
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jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #2 on: May 19, 2014, 01:35:55 PM »
yes, or something close to that effect.....

if I were to clear out the trouble codes, would it erase the data for the I/M tests as well? or just get rid of the CEL?
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emsvitil

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Re: OBD II Code Reader Questions
« Reply #3 on: May 19, 2014, 01:41:16 PM »
I'm pretty sure that clearing codes also resets the monitors.

Which means you have to drive it awhile for the monitors to reset (which will cause the code to reappear)
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jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #4 on: May 19, 2014, 01:43:54 PM »
emsvitil, you are right, just found that out on some info I found.....

looks like I am trying to get a new reader......

I will also be swapping in my stock o2 sensors for test purposes today
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Re: OBD II Code Reader Questions
« Reply #5 on: May 19, 2014, 03:24:05 PM »
There's lots of readers out there now that will connect via Bluetooth/wifi to phone, tablets and PCs.  I personally use one from OBDLink.  http://www.obdlink.com/.  Once you get the hardware, there are several different apps you can download to use it other than the stock app. (Well, atleast on Android there is.  I use one called Torque).
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Re: OBD II Code Reader Questions
« Reply #6 on: May 21, 2014, 08:05:55 AM »
As emsvitil said, when I clear the codes on my 3RZ, all of the on-board monitor lights on my scanner's output all turn red. Most of them go back to Green (passed) within a matter of minutes but the Evap test has taken up to 2 weeks to clear. It's dependent on how many key cycles (ON/OFF) and distance traveled I believe.

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jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #7 on: May 21, 2014, 08:21:07 AM »
the new scanner I picked up yesterday has a quick glance screen on it.... I did some driving yesterday, but only around town, and not too many miles. I will post up with what it tagged later. I know for sure, one was O2S
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Re: OBD II Code Reader Questions
« Reply #8 on: May 21, 2014, 05:55:18 PM »
MIS = Misfire Monitor
FUE = Fuel System Monitor
CCM = Comprehensive component Monitor
CAT = Catalyst Monitoring (this can sometimes take a week or longer)
HCAT = Heated Catalyst Monitor
EVAP = Evaporative System Monitor
AIR = Secondary Air System Monitor
O2S = Oxygen Sensor Monitor (this always goes green quickly for me)
HRT = Oxygen Sensor Heater Monitor (this also always goes green quickly for me)
EGR = EGR System Monitor

What engine are you scanning?
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jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #9 on: May 21, 2014, 06:03:13 PM »
vehicle is a 1996 dodge ram van, b2500, 2wd, swb, automatic, 3.9l v6

I have a thread in the tow rig section with new smog numbers and old smog numbers and what I have done to it as well

http://board.marlincrawler.com/index.php?topic=93714
:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #10 on: May 25, 2014, 11:54:30 PM »
http://board.marlincrawler.com/index.php?topic=93714

bigmike! here is the thread, well, I guess combined with this one as well, and the link to see where I am at over on the dodge forum.....

can you check out my chronicled journal here on it?

I think you might have some beneficial input for me

especially the last post


http://dodgeforum.com/forum/dodge-ram-van/374977-failed-smog-again-new-issues-and-codes-2.html

any questions? post up, I will respond quickly
:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #11 on: May 26, 2014, 12:49:51 PM »
here is that last post:

Quote from: jimbo74;3168538
As of tonight, I have 1 pending code, and nothing else stored

and a new I/M


Now, of course, I want to look into that pending code, and it looks like it is my o2 sensor, bank 1 sensor 2.... as I only have 2 sensors, this will be the one after that cat.

well, I went into my live stream... and it never changes voltage. the upstream one does on my live display.. Does this have anything to do with it?

the only I/M I don't have lit up as passing is HRT. for the ones with the grey O with a slash through it, I assume I don't need to worry about those? as I know one is for EGR and my motor doesn't have that system









also, while browsing online, I stumbled upon this:

http://www.epa.gov/otaq/regs/im/obd/regtech/420f08009.pdf


does this mean my vehicle is exempt or what? or for a portion? as I only have 1 I/M not reporting now, should I be perfectly fine on the test?
:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #12 on: May 27, 2014, 10:08:16 AM »
well, it didn't happen.... took my daughter to school today, and the light popped on.....

p0141, p0300, p0304 at this point all I/m monitors were ready, but since I had to clear out he mil, it reset those 3 again o2s, hrt and cat
:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

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Re: OBD II Code Reader Questions
« Reply #13 on: May 27, 2014, 01:24:23 PM »
Ohhh man... I don't know anything about Dodge Vans :down:

Have you replaced your O2 sensors yet? If not, and if they are on different banks, flip them all between banks, reset your codes, and then see if the ECU picks up the code from a different bank (which would point to a possibly defective O2 sensor)
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jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #14 on: May 27, 2014, 01:34:35 PM »
i have only 2 o2 sensors

both are bank 1, 1 of them is before the cat, and 1 is after

I did replace the sensors, and kept getting codes, so then I put back the stock ones off my old exhaust, and got codes, just less codes
:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #15 on: Jan 04, 2016, 10:44:55 PM »
So, with some work done, no codes as of yet, but hrt and cat are still in the red x zone.....
:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

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Re: OBD II Code Reader Questions
« Reply #16 on: Jul 28, 2016, 05:41:38 PM »
I have a 97 Chevy 350. No codes showing on obd2, but the hrt, egr, o2s, cat were blinking and the ccm, mis, and fue were just on. Truck was hit an miss on when it wanted to start. Now it won't start at all. I hear fuel pump come on. Haven't gotten around to check fuel pressure or spark. Any ideas of what those acronyms mean?


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haleyporter0939

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Re: OBD II Code Reader Questions
« Reply #17 on: Jul 28, 2016, 05:42:17 PM »
I know what the acronyms stand for but why are they blinking?


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Re: OBD II Code Reader Questions
« Reply #18 on: Jul 28, 2016, 05:56:53 PM »
there blinking because the computer has not ran its drive cycle for those items. was the battery recently disconnected, or dead, and battery installed? every vehicle has a different drive cycle, I would look up your specific vehicle for what you need to do  :twocents:
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haleyporter0939

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Re: OBD II Code Reader Questions
« Reply #19 on: Jul 28, 2016, 05:57:30 PM »
Yeah I just figured it out. And yes battery was recently disconnected


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haleyporter0939

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Re: OBD II Code Reader Questions
« Reply #20 on: Jul 28, 2016, 06:08:05 PM »
But after I hooked it back up it started right up then 10 mins later it never started back up again.


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jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #21 on: Jul 28, 2016, 07:04:10 PM »
how do you have 0 posts?

anyways, you need to do some digging..... that is a lot of lights..... are you sure you don't have any codes? typically the ligths wont trigger, until the code has gone through pending a couple times
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haleyporter0939

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Re: OBD II Code Reader Questions
« Reply #22 on: Jul 28, 2016, 07:05:57 PM »
I guess I didn't have the obd2 hooked up log enough. Once it said no dtc...I unhooked it.


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Re: OBD II Code Reader Questions
« Reply #23 on: Jul 28, 2016, 07:07:24 PM »
Think I messed up the pcm or put the truck in anti theft mode but my security light don't turn on.


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emsvitil

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Re: OBD II Code Reader Questions
« Reply #24 on: Jul 28, 2016, 07:17:36 PM »
chit chat doesn't add to post count
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jimbo74 [OP]

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Re: OBD II Code Reader Questions
« Reply #25 on: Jul 28, 2016, 07:19:58 PM »
Ok, so it isn't showing any dash lights or codes? Then it is fine..

Now, if it isn't starting, you should look into that... the dash lights come on in the run position, and go away once started once running.

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:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

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Re: OBD II Code Reader Questions
« Reply #26 on: Jul 28, 2016, 07:29:20 PM »
Shows dash lights but no codes.


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