clearing codes
Thread Starter
|
Senior User
Joined: Nov 2008
Posts: 139
Likes: 0
From: okc,oklahoma
alright thanks. by jumper wire do you mean the 6 pin or the one pin
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
The jumper between STI (single wire) and SIGRTN/Ground. Fordfuelinjection.com says to short STI to ground, but it is easiest to jumper it to the signal return pin in the 6 pin connector with something like a paperclip.
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
One thing to note is that you need to do this twice--once for KOEO codes and once for CM codes. Even though the CM codes flash out after the KOEO codes, they don't get cleared if you pull the jumper while the KOEO codes are being flashed. You have to start the code-flashing process again, and pull the jumper while the CM codes are flashing.
Jason
Jason
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
The CM codes are the only ones that can get cleared. Any codes that flash before the separator pulse are things that the computer sees wrong at the time of the test.
Trending Topics
Thread Starter
|
Senior User
Joined: Nov 2008
Posts: 139
Likes: 0
From: okc,oklahoma
will do, thanks
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
I believe you're thinking of KOER (Key On, Engine Running) codes--which are read with the engine running, and are cleared as soon as the engine is shut off.
Jason
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
I believe you're thinking of KOER (Key On, Engine Running) codes
References: http://www.thorssell.net/hbook/eectest.html
and Ford Fuel Injection and Electronic Engine Control by Charles Probst
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
If you pull the paperclip while the KOEO codes are flashing out, they will be cleared. (Try it...unplug something to set a code with the engine running, then check the codes). If you do not run the engine again before checking the KOEO codes again, all you'll get is a 111 code before the separator pulse, but the CM codes will still be there.
I know because my '93 has a tranny issue that only sets codes when I drive it. I can endlessly duplicate what I said above. That was when I discovered that I had to clear the CM codes separately (pull the "paperclip" AFTER the separator pulse).
Jason
I know because my '93 has a tranny issue that only sets codes when I drive it. I can endlessly duplicate what I said above. That was when I discovered that I had to clear the CM codes separately (pull the "paperclip" AFTER the separator pulse).
Jason
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
It should be impossible to clear hard faults. Here is a quote from the website I linked to in my last post:
Here's from another website:
http://therangerstation.com/tech_library/OBD_I.html
Also, the CM codes should be cleared regardless of which part of the KOEO test the computer is currently in, hard faults or memory codes.
For a HARD fault code the sensor IS out of range right now.
For a MEMORY code, it WAS out of range at one time (possible intermittent wire etc.).
For a MEMORY code, it WAS out of range at one time (possible intermittent wire etc.).
Stopping the test during code transmission will erase the continuous memory.
Also, the CM codes should be cleared regardless of which part of the KOEO test the computer is currently in, hard faults or memory codes.
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
Okay, let me put it this way. TPS is junk and throwing codes (and truck is running like crap--BTDT). Replace TPS. Without starting truck, all the original codes will be there (when my TPS went a few years ago, it threw about 4 KOEO codes). They can then be cleared as I described--pulling the jumper during KOEO before the separator. The CM codes will still be there, which will need to be cleared separately.
Maybe the '87-'91 trucks are a bit different (they do have 2-digit codes), I didn't play with reading codes much on my '90 (stopped driving it before I found FTE and learned how to read codes).
Jason
Maybe the '87-'91 trucks are a bit different (they do have 2-digit codes), I didn't play with reading codes much on my '90 (stopped driving it before I found FTE and learned how to read codes).
Jason
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
Maybe so, but I haven't seen anything online to indicate any difference in procedure between 2 and 3 digit codes, and the CM codes are the only ones actually stored in the computers memory. I'll give it a try when I get my truck back together, and maybe try my dad's truck when I'm back home this coming weekend (2 vs. 3 digit).
To edit what I said in my last post, instead of being impossible to clear, hard faults should only be able to be cleared by fixing the cause of the problem. They are not stored in memory, so in theory, they should not be able to be cleared by pulling the jumper. I'm hoping to test that theory soon.
To edit what I said in my last post, instead of being impossible to clear, hard faults should only be able to be cleared by fixing the cause of the problem. They are not stored in memory, so in theory, they should not be able to be cleared by pulling the jumper. I'm hoping to test that theory soon.
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
But those codes are stored in some kind of memory--the test is done before the codes are ever flashed out (which happens 3 times--the quick flashes for a code reader, then they're repeated twice).
Jason
Jason