Welcome to the North American Subaru Impreza Owners Club Tuesday April 21, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-07-2009, 05:56 PM   #1
JamesWilson2
ForumWars Winner!
 
Member#: 196948
Join Date: Dec 2008
Chapter/Region: TXIC
Location: Kyle, TX
Vehicle:
2003 Forester
Silver

Question How to Reset ECU?

OBDII reader keeps showing a code, even after I reset it. There was a Recall years ago that said that there were bad ECU's that always had the CEL lit for "no reason". This particular code is regarding the front O2 sensor, which passes all voltage and continuity tests...usually with this type of code, it takes at least a few minutes of faulty action to trigger the CEL. No matter what, the CEL is illuminated immediately.

Using the search function, I was reading a thread where the ECU can be reset by disconnecting the battery and pumping the brakes...this was regarding a WRX. Is this method correct for my '00 Legacy (non-turbo 2.5L)? If not, how do I reset?

PS-- I have been to Advance Auto and Autozone, and while they check the codes for me they cannot reset...I have an OBDII scanner that has proven faulty in the past, so this ECU reset + fresh read is my last resort before going to Subaru and paying $100 just for a stupid scan...plus any other fees for checking for my Recall.
* Registered users of the site do not see these ads.
JamesWilson2 is offline   Reply With Quote
Old 01-07-2009, 06:03 PM   #2
sofresh
Scooby Specialist
 
Member#: 156677
Join Date: Aug 2007
Chapter/Region: South East
Location: Fort Myers/Orlando
Vehicle:
2005 WRX
OBP

Default

I think its as simple as disconnecting your battery and pushing the break a couple of times to run the juice out. Probally the same for all models.

Someone else chime in?
sofresh is offline   Reply With Quote
Old 01-07-2009, 06:16 PM   #3
JamesWilson2
ForumWars Winner!
 
Member#: 196948
Join Date: Dec 2008
Chapter/Region: TXIC
Location: Kyle, TX
Vehicle:
2003 Forester
Silver

Default

Just tried it, but now I can't find my OBDII scanner...figures

Off to dinner, check along the way. I'll look for my scanner when I get home if the CEL is still illuminated.
JamesWilson2 is offline   Reply With Quote
Old 01-07-2009, 07:49 PM   #4
rick-l
Scooby Specialist
 
Member#: 33868
Join Date: Mar 2003
Location: Chesterfield, MO
Vehicle:
2003 wrx
srp

Default

What is the code?

A lot of faults in the manual say this:

DTC DETECTING CONDITION:
Immediately at fault recognition
rick-l is offline   Reply With Quote
Old 01-07-2009, 08:01 PM   #5
JamesWilson2
ForumWars Winner!
 
Member#: 196948
Join Date: Dec 2008
Chapter/Region: TXIC
Location: Kyle, TX
Vehicle:
2003 Forester
Silver

Default

CEL was off for about 3 seconds, then came right back on.

I think the code was either P1130 or P1131, a fault with the front O2 sensor's circuitry. I can't find my scanner at the moment (somewhere in the garage, or the car maybe) so I can't confirm.
JamesWilson2 is offline   Reply With Quote
Old 01-07-2009, 08:08 PM   #6
rick-l
Scooby Specialist
 
Member#: 33868
Join Date: Mar 2003
Location: Chesterfield, MO
Vehicle:
2003 wrx
srp

Default

how about these? do you have the manual fo this car?

DTC PO130 - FRONT OXYGEN (NF) SENSOR CIRCUIT RANGE/PERFORMANCE
PROBLEM (LEAN) -
DTC DETECTING CONDITION: Immediately at fault recognition

DTC PO131 - FRONT OXYGEN ( N F ) SENSOR CIRCUIT MALFUNCTION
(OPEN CIRCUIT) -
DTC DETECTING CONDITION: Immediately at fault recognition
rick-l is offline   Reply With Quote
Old 01-07-2009, 08:08 PM   #7
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

this indicates a fault somewhere...not a faulty ecu
if the ecu was truly faulty, there would almost certainly be more issues associated with the failure

this kind of thing may require the factory manual and some sleuthing
Uncle Scotty is online now   Reply With Quote
Old 01-07-2009, 08:41 PM   #8
JamesWilson2
ForumWars Winner!
 
Member#: 196948
Join Date: Dec 2008
Chapter/Region: TXIC
Location: Kyle, TX
Vehicle:
2003 Forester
Silver

Default

Found some images of wiring diagrams and the fault trace and steps for each particular Code, but I think it's for the WRX. I've already checked continuity and voltage for the O2 sensor, and Gilman Subaru SW wants $100 just to look at it....a new sensor (DENSO OEM #234-9018) is $135.34 best I've found from SparkPlugs.com.......I'd hate to spend $100 + $135 just to confirm, when it could be just a faulty ECU...my VIN does show that it was one of the cars that fell under the Recall for bad ECU's (for CEL's remaining on for no reason), but was supposedly replaced under warranty in 2002....but who knows, to find out if the ECU is bad again it's another $100. Darned if you do, darned if you don't. There's a Mossberg shotgun with my name on it for about that price, I'd rather have the shotgun
JamesWilson2 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
how to reset ecu? plus plus plus Engine Management & Tuning 4 03-01-2006 08:37 AM
How to reset ECU on WRX? SpoonTypeR Newbies & FAQs 2 06-21-2004 05:51 AM
how to reset ecu? jefersun Engine Management & Tuning 1 11-09-2003 01:35 PM
How to reset ECU without setting off the alarm? toerag Newbies & FAQs 2 01-28-2002 01:16 PM
How to reset ecu? Robmat General Forum Archive 4 11-17-2000 12:46 AM


All times are GMT -4. The time now is 08:42 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.