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Old 10-24-2001, 09:42 AM   #1
Strafe
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Default CEL Question...

I got a CEL on my way home from work on Monday night. It happened half-way through my 38 mile work commute cruising at a steady 65mph. I felt and noticed nothing out of the ordinary, the car felt perfect. I got home and unhooked the battery for 3 hours. Hooked it all back up and the CEL was gone. I drove it all day Tuesday (to and from work 76 round trip) and no CEL. Now this morning half-way to work (38 miles) cruising at around 70 mph, CEL!!! Damn, I thought it was a fluke.

About 15 days ago I installed an MRT turbo back, Injen Intake, and TurboXS HPMBC (set at .1MPa in 4th and 5th @ WOT). I had no problems until Monday evening. I have over 20,000 miles on the WRX since Mid-March and have never had one single problem. (Except for that shuddering clutch thing in the cold. )

So, I want to take it over to a local Subaru dealership to have them "pull the code". Should I take off the MBC before I go over or take it over as is?

Thanks in advance,

Dennis
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Old 10-24-2001, 09:49 AM   #2
dug-e-fresh
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Take it off!! Better yet find someone (friend) nearbuy that has a scan tool and pull it yourself. Or go to this Web Site . Here you can download the software to scan your car for free.....the catch is, you must buy the interface. Thats costs about $130 or something. This has come in very handy for me....I will never take my car back to the dealer for a CEL alone.........if the CEL is something bad, then yes......
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Old 10-24-2001, 09:54 AM   #3
RiftsWRX
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I'm thinking your going to pull

an exhaust gas temerperature circuit high code P0547 or p0546 IIRC.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 10-24-2001, 09:57 AM   #4
Strafe
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That software/hardware sounds great! Just what I need.

dug-e-fresh... That scan tool works with our 2002 WRXs?

Anyone else using that ODB-2 scan tool? Is it worth it? Is there a better one out there? I'd love to be able to "pull" my own codes and not have to rely on the dealership.

-Dennis
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Old 10-24-2001, 10:11 AM   #5
dug-e-fresh
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heck yeah it works!! There may be better ones out there....but I am very happy with this one!! With the ISO connector you can scan ANY imported car that is OBD-II ISO compliant (also European and Chrysler vehicles). I have scanned friends VWs, Toyotas, My WRX and a Talon....

It will display every sensor that your car uses and the value that each sensor reads. You can read the CODES, clear the codes and by looking at the freeze frame tab, you can examine the exact conditions (each sensor reads) when the CEL was thrown. You can save each scan that you do, and it will display everything graphically or in virtual gauges.

It also shows high values and low values, it has an ET option that reads your speedo, so you can run 0-to whatever mph times....actually there are so many features I am not sure what most of them do....that would be its only down fall......

If you get more than one module thingy it will cost less for each. Basically they are divided into 3 categories-

1- ISO- Asian, European and Chrysler
2- GM
3- Ford

The ISO unit gives you the most for the money, and besides thats the one you want for your Subie. I have a laptop at the moment that I use, but I plan on getting a Palm, and then downloading the Palm version of the software....that will be really cool.........and its free!! All you need to by is the connection line with the module.......
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Old 10-24-2001, 10:33 AM   #6
Strafe
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Default

I have a Palm Vx and a new Sony laptop, so I'm definitely interested in this software and cable. But I have one last question before I PayPal these guys.

I'm guessing you'll see a number code, like in the demo version of the software with the sample data and like what RiftsWRX posted. Where/how do you cross-reference that number with a textual information? Is that built in to the code scanning software? Are those number codes and what they mean, generic to all ODB-2 based cars?

Thanks for helping a dummy out!

-Dennis
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Old 10-24-2001, 10:41 AM   #7
dug-e-fresh
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It will give you a generic meaning of the code....like if the 1443 code will be identified by the scan tool it will describe that as an "Auxillary Emissions Control" code....meaning you Gas Cap is probably loose....but if you throw a 0301, 0302, 0303 and 0304, they are all misfire codes and it will say "misfire on cylinder X"

Subaru techs scan tool will have the direct meaning that subaru wants the code to mean to the tech...but that thing is expensive....

A VW that I scanned had a code for the "ROM....", it was because he was running a chip....

A Celica GT-S had a "Idle Higher Than Normal" code or something, and the guy had acually adjusted his idle higher...so I mean it will give some sort of description along with the actual code....it may be a little vague depending on the car you scan....some cars have the info built in and the software will display more of that info....

Recently I saw a post were someone had said that there was an entire list of Suby codes and there exact meaning floating around....that there would be enough to figure anything out...
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Old 10-24-2001, 10:46 AM   #8
Strafe
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Default

Just bought it. Gotta love that PayPal!

Thanks to dug-e-fresh.

-Dennis
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Old 10-24-2001, 11:03 AM   #9
dug-e-fresh
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I thinks its invaluable investment.....if for nothing else, but peace of mind!

I am sure you will like it....let us no what code you pull...

Doug
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Old 10-24-2001, 11:20 AM   #10
Strafe
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I'll post a follow up in this thread as soon as I get the scanner.

I think I'll reset the ECU after lunch and keep my fingers crossed until tomorrow.

-Dennis
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Old 10-24-2001, 01:29 PM   #11
PunksWRX
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Strafe,

I will be very interested in the code you pull especially if it is "low cat efficiency". I just threw this CEL with MRT turbo back exhaust and I know of another person that also threw the same low cat efficiency CEL running an MRT.

Check this post:

http://i-club.com/forums/showthread....hreadid=105252

Punk
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Old 10-24-2001, 01:41 PM   #12
Strafe
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Default

I read through that thread and was pretty concerned. I went with MRT because no one seemed to be getting CELs.

-Dennis
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Old 10-24-2001, 02:26 PM   #13
Sev
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Thumbs up Take a look here.........

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Old 10-24-2001, 04:38 PM   #14
Jon [in CT]
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If you'd like a list of all 2002 Impreza trouble codes and their descriptions to use with your scan tool, then scroll down this thread, http://www.i-club.com/forums/showthr...threadid=99834 until you see a post by me with a .txt file attachment and then download it.
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Old 10-24-2001, 04:40 PM   #15
Strafe
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Jon [in CT]... Thanks a bunch for that list. I just found that thread through another thread by doing a search. Imagine that. Heheheheheheh.

-Dennis
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Old 10-25-2001, 09:09 PM   #16
Strafe
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Default

OK!!!! The code is in... and... the winner is...

P0420 Catalyst system efficiency below threshold
(Code info. courtesy of Jon [in CT])

With a 2 week old MRT turbo-back.

Nice!!!!

-Dennis

Last edited by Strafe; 10-25-2001 at 09:50 PM.
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Old 10-25-2001, 10:46 PM   #17
Strafe
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Default

Has anyone been able to get the www.obd-2.com software to work with a USB-COM adaptor cable thingy?

My new Sony VAIO laptop doesn't have a built-in COM port. So, I had to buy a USB-COM adaptor to make my Palm Vx work. I was using that adaptor with the cable from www.obd-2.com. No luck. I ended up having to use an old poop Toshiba with a built-in COM port, no battery and a stupid long extension cord, so I could drive around the block. It worked the first time I plugged it in.

Also, how live is the data sample rate, like for the dashboard? Mine seemed to updating every second or so. I wish it was in real time. Can that be done?

Thanks again!

Dennis
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Old 10-26-2001, 12:01 AM   #18
Jon [in CT]
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Quote:
My new Sony VAIO laptop doesn't have a built-in COM port. So, I had to buy a USB-COM adaptor to make my Palm Vx work.
I must be clueless, but I've never heard of a laptop that didn't have a COM port. And even if somebody were to make such a machine, who would buy it?
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Old 10-26-2001, 03:33 AM   #19
PERRIN
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Default

compacs don't all have a com port either! stupid idea not to have a com port.
the CEL will not effect anything on the engine. it won't retard timing or anything. not all codes will "detune" your engine. i am going to make an adpater that will plug into the existing harnes that will eliminate the rear O2 reading.
The rear one isn't really used for tuning by the ecu anyway.
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Old 10-26-2001, 07:34 AM   #20
dug-e-fresh
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Default

Strafe-

The data will approach real time with less items selected. Like if you send all, then you will see huge delays in a particular data item, however if you are just wanting to look at one or two and you only send those one or two, then the data refreshes much, much, much quicker......then you can set the gauges up to show the data real time......

This is not a problem with the software, from what I understand any and all Scan Tools will have slow refresh rates with all data selected, and quicker rates with less data selected.

As for the Com port, OBD-IIs website says they will give all the tech support needed. Perhaps you could e-mail/call them and have them walk you through connecting the cable to a different port and setting that up in the software...

I had no problems with mine....just plug and play, but I also have the serial port needed......

Good luck,
Dug

Last edited by dug-e-fresh; 10-26-2001 at 07:44 AM.
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Old 12-14-2001, 11:32 PM   #21
JohnWad
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Default MRT CEL Too

Strafe,

I have a very similar set up to you and have been dealing with the CEL on my MRT for a few months now. My CEL always comes a few hundred miles after a reset and cruising at about 2500-2800 RPM (70 MPH in 5th). The only thing I have heard that will may work on eliminating the CEL is to wrap the downpipe in thermal wrap. I have wrapped mine (except for the cat itself) and got a CEL this week, so tomorrow the cat is getting covered as well. If this does not work, I hope someone figures out a way to trick the ECU. It must be just me, but the car seems to get slower after the CEL comes on. Probably just paranoid.
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