Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

How do you reset the computer?

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 05-12-2007, 09:57 PM
S_Bruce S_Bruce is offline
Junior User
 
Join Date: Feb 2007
Location: Eastern Washington
Posts: 85
S_Bruce is starting off with a positive reputation.
How do you reset the computer?

I've read a couple of posts where people did some repairs and reset the computer upon completion. What does this actually do for your truck? How would you go about doing it.
As long as I'm tearing into my engine anyway, might as well replace the various input sensors for speed density and reset the computer!

'95 F150, 351, E4OD, 4x4
Reply With Quote
  #2  
Old 05-12-2007, 10:04 PM
eco eco is offline
Posting Guru
 
Join Date: Jan 2006
Location: The dark carnival
Posts: 1,263
eco is starting off with a positive reputation.
Quote:
Originally Posted by S_Bruce
I've read a couple of posts where people did some repairs and reset the computer upon completion. What does this actually do for your truck? How would you go about doing it.
As long as I'm tearing into my engine anyway, might as well replace the various input sensors for speed density and reset the computer!

'95 F150, 351, E4OD, 4x4
Disconnect the negative battery cable and leave it disconnected for at least 30 minutes.

This erases all the memory in the computor and forces it to relearn what is "normal" for all of it's various inputs and what not. Since not all sensors are created equal, it is a good idea to do this when replacing sensors.
Reply With Quote
  #3  
Old 05-12-2007, 10:09 PM
S_Bruce S_Bruce is offline
Junior User
 
Join Date: Feb 2007
Location: Eastern Washington
Posts: 85
S_Bruce is starting off with a positive reputation.
Right on, eco. Thanks for the quick post. This forum is the best I've been a part of, truly an invaluable resource to home mechanics!
Reply With Quote
  #4  
Old 05-13-2007, 01:56 PM
jimbo beam's Avatar
jimbo beam jimbo beam is offline
Posting Guru
 
Join Date: Apr 2005
Location: Hawkeye Country
Posts: 2,243
jimbo beam is a splendid one to beholdjimbo beam is a splendid one to beholdjimbo beam is a splendid one to beholdjimbo beam is a splendid one to beholdjimbo beam is a splendid one to beholdjimbo beam is a splendid one to behold
Just thought I'd add when the computer is disconnected the engine will need to relearn its idle. After reconnecting the battery start the truck and let it idle for a minute, it may idle a little shaky at first but it will sort its self out.

If you were to just hop in the truck and drive off it would take a little while for it to relearn its idle again.
__________________
96 F150 2wd Eddie Bauer Edition, built 306/4r70w. GT40 heads, e303 cam, JBA shorties, bassani catless ypipe, 3 inch single with a super 44.
94 F150 4x4. 351/ZF5 (was originally 300/e4od) 4 inch lift, 4.10 gears, 33x12.50 BFG KM2's. hedman longtubes and glasspacks.
94 F150 4x4 302/e4od (winter truck/beater)
76 F250, 460/c6 (grandad's old rig)
Reply With Quote
  #5  
Old 05-13-2007, 11:52 PM
e1p1's Avatar
e1p1 e1p1 is offline
Posting Guru
 
Join Date: Feb 2004
Location: CA Central Coast
Posts: 1,421
e1p1 has a good reputation on FTE.e1p1 has a good reputation on FTE.e1p1 has a good reputation on FTE.
Another reason for knowing how to do this:
My truck occasionally has the check engine light come on, and throws a code for the EGR. CA emissions test will fail me automatically if it reads the stored code.

Twice in the last 4 years before getting tested, I disconnect the battery and clear the codes, and she passes no problem. This last time, the CEL came on again on the way home from the test.

I suppose one of these days I oughtta get under the hood for real...
__________________
Braccae tuae aperiuntur

'93 F-150 4x4 Supercab Longbed, 5.0L, AOD, BFD...No Mods.
'94 Lincoln Town Car
'93 Taurus Wagon, 3.8L . Dog is my co-pilot.
Reply With Quote
  #6  
Old 05-14-2007, 07:08 AM
shooter05's Avatar
shooter05 shooter05 is offline
Senior User
 
Join Date: Aug 2005
Location: Newark, Ohio
Posts: 211
shooter05 is starting off with a positive reputation.
you can clear the codes by just reading them. you don't have to disconnect the battery.
__________________
1995 F150 2wd
4.9 6 cylinder
81,000 miles
4spOD
Reply With Quote
  #7  
Old 05-17-2007, 08:39 PM
netscaner netscaner is offline
Elder User
 
Join Date: May 2007
Location: Solon, Ohio
Posts: 754
netscaner is starting off with a positive reputation.
The best way I've found to erase the memory codes is to pull the jumper in the middle of the tests. This immediately halts the test and resets the constant memory to 1-1-1 again. You don't have to wait 30 minutes that way.
Reply With Quote
  #8  
Old 05-17-2007, 08:48 PM
eco eco is offline
Posting Guru
 
Join Date: Jan 2006
Location: The dark carnival
Posts: 1,263
eco is starting off with a positive reputation.
Quote:
Originally Posted by netscaner
The best way I've found to erase the memory codes is to pull the jumper in the middle of the tests. This immediately halts the test and resets the constant memory to 1-1-1 again. You don't have to wait 30 minutes that way.
Quote:
Originally Posted by shooter05
you can clear the codes by just reading them. you don't have to disconnect the battery.
Maybe so, but there is a difference between 1) Trying to get rid of the stored codes in the computer and 2) Forcing the computer to re-learn what is normal for all of the sensors so that the computer is able to properly run the engine after different parts of the engine management system have been replaced with new parts. The thread starter is trying to do the latter.

Last edited by eco; 05-17-2007 at 08:51 PM.
Reply With Quote
  #9  
Old 05-17-2007, 09:55 PM
netscaner netscaner is offline
Elder User
 
Join Date: May 2007
Location: Solon, Ohio
Posts: 754
netscaner is starting off with a positive reputation.
eco, are you saying that the battery disconnect method erases all memory, and the jumper only erases stored codes ??

That's good to know.
Reply With Quote
  #10  
Old 05-18-2007, 12:14 AM
eco eco is offline
Posting Guru
 
Join Date: Jan 2006
Location: The dark carnival
Posts: 1,263
eco is starting off with a positive reputation.
Quote:
Originally Posted by netscaner
eco, are you saying that the battery disconnect method erases all memory, and the jumper only erases stored codes ??
Yes............
Reply With Quote
  #11  
Old 05-18-2007, 01:09 PM
shooter05's Avatar
shooter05 shooter05 is offline
Senior User
 
Join Date: Aug 2005
Location: Newark, Ohio
Posts: 211
shooter05 is starting off with a positive reputation.
Quote:
Originally Posted by e1p1
Another reason for knowing how to do this:
My truck occasionally has the check engine light come on, and throws a code for the EGR. CA emissions test will fail me automatically if it reads the stored code.

Twice in the last 4 years before getting tested, I disconnect the battery and clear the codes, and she passes no problem. This last time, the CEL came on again on the way home from the test.

I suppose one of these days I oughtta get under the hood for real...
I guess I was under the impression he just wanted to clear them to pass his test, But yes if a new part is installed then it is a good idea to unhook the battery and do a total reset.
__________________
1995 F150 2wd
4.9 6 cylinder
81,000 miles
4spOD
Reply With Quote
  #12  
Old 05-18-2007, 01:26 PM
andym's Avatar
andym andym is offline
Post Fiend
 
Join Date: Mar 2002
Location: Sacramento, CA
Posts: 16,704
andym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputationandym has a superb reputation
Just two things to add - there is virtually nothing to gain by replacing SD sensors just because you're in there. If they're good, they're good. Given the quality of some aftermarket parts, you are better off leaving a working sensor in place.

Secondly, reading the codes from an OBD-I computer doesn't reset them. Whoever posted that is thinking of OBD-II.
__________________
Andy 2000 Excursion Limited 7.3L 4x4 V/mod B spring swap * S&B CAI * Hellwig anti-sway bar * MBRP 4" exhaust * 25 cent mod * hutch mod * 6.0 cooler

"If you want to live in a country that manufactures things, you need to buy things that your country manufactures." - Mike Rowe
Reply With Quote
Old 05-18-2007, 01:26 PM
 
 
 
Reply


Similar Threads
Thread Thread Starter Forum Replies Last Post
how do you reset the computer on 1993 f150 Johnblagg 1987 - 1996 F150 & Larger F-Series Trucks 1 10-18-2010 08:14 PM
Question on computer resetting. ddrumman2004 General Automotive Discussion 9 06-23-2006 11:54 AM
How do you reset /clear the computer in a 93 F150, 5.0? txlnghrn 1987 - 1996 F150 & Larger F-Series Trucks 1 01-26-2005 04:54 PM
How to Reset Computer on Ford Escape watchdog Computer Chips & Tuners 0 11-13-2003 05:16 PM
ECM Reset Rtpjunior Expedition & Navigator 8 06-14-2003 12:55 PM


Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks

Tags
150, 2000, 2003, 250, 49, 93, battery, computer, econolin, f150, ford, pickup, replaced, replacing, reset, rest, truck

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »


All times are GMT -5. The time now is 08:17 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup