Replace PCM DIY - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus First Generation > MK1 Focus

MK1 Focus The place to chat about general questions, window tinting, exterior body, interior and lighting upgrades for the first generation 2000-2007 Focus.

Search This Forum | Image Search | Advanced Search    
FocusFest

Reply




 
LinkBack Thread Tools Display Modes
Old 05-17-2016, 09:06 PM   #1
Focus Rookie
 
Join Date: May 2016
Fan#: 304305
Location: savannah, GA
What I Drive: brown, 2007 SES

Posts: 11
Points 42, Level 1
Points: 42, Level: 1 Points: 42, Level: 1 Points: 42, Level: 1
Level Up 84% Completed
Level up: 84% Level up: 84% Level up: 84%
Forum Activity 8%
Activity: 8% Activity: 8% Activity: 8%
FF Reputation: 1 bryesh Good Standing Member
Buy-Sell-Trade Rating: (0)
Replace PCM DIY

I have a 2007 focus with a bad Pcm. I have a good PCM ready to go but it won't work because of the PATs system. What's my best way to proceed?

I"d really like to avoid being at the mercy of a shop. Are there any programmers who can bypass the Pats on my good PCM so it will work when I install it? I'd rather pay for a programmer who can eliminate a trouble prone system on my car in the process.

Any other ideas on how I should proceed are greatly appreciated.

Thanks in advance
Bryesh


bryesh is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-17-2016, 09:13 PM   #2
Elder
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Lockport, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 39,047
Points 27,917, Level 98
Points: 27,917, Level: 98 Points: 27,917, Level: 98 Points: 27,917, Level: 98
Level Up 57% Completed
Level up: 57% Level up: 57% Level up: 57%
Forum Activity 100%
Activity: 100% Activity: 100% Activity: 100%
FF Reputation: 125 sailor Excellent Standing Member sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Check the stickie from the top of this page for a DIY answer:Programming MK1 Keys

Or get it done by a locksmith instead of Dealer.

Haven't heard of a bypass possibility for any duratec PCM's.
__________________
"Rubber Side Down"

S.R. #275
Focus Takeover #003 / Tarbo Fan #003
sailor is offline  
    Reply With Quote Quick reply to this message
Old 05-18-2016, 01:08 AM   #3
Focus Fanatic
 
Join Date: Mar 2012
Fan#: 96610
Location: Fort Worth, TX
What I Drive: 00 wagon, 02 sedan both zetec atx

Posts: 10,328
Points 6,091, Level 50
Points: 6,091, Level: 50 Points: 6,091, Level: 50 Points: 6,091, Level: 50
Level Up 71% Completed
Level up: 71% Level up: 71% Level up: 71%
Forum Activity 100%
Activity: 100% Activity: 100% Activity: 100%
FF Reputation: 54 amc49 Excellent Standing Member
Buy-Sell-Trade Rating: (0)
And don't be surprised if new one fixes nothing, unless you have already checked the umpteen ways they need to be checked. Pretty unusual for them to go bad unless helped to. Most guesses they are bad are in error.
amc49 is offline  
    Reply With Quote Quick reply to this message
Old 05-18-2016, 10:00 AM   #4
Focus Enthusiast
 
Marklar134's Avatar
 
Join Date: May 2015
Fan#: 239202
Location: Las Vegas, NV
What I Drive: 2006 silver zx3 SES

Posts: 221
Points 475, Level 9
Points: 475, Level: 9 Points: 475, Level: 9 Points: 475, Level: 9
Level Up 50% Completed
Level up: 50% Level up: 50% Level up: 50%
Forum Activity 16%
Activity: 16% Activity: 16% Activity: 16%
FF Reputation: 5 Marklar134 Good Standing Member
Buy-Sell-Trade Rating: (0)
and typically you'll need to have it programmed. i think they sell some "pre-programmed", but i know when we replace them at work we have to go through programmable module installation, which means pulling the info from the old pcm, programming the new one and resetting some of the learned and base info for the vehicle.
Marklar134 is offline  
    Reply With Quote Quick reply to this message
Old 05-18-2016, 11:18 AM   #5
FF Affiliate
 
1turbofocus's Avatar
 
Join Date: Oct 2003
Fan#: 1123
Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

Posts: 26,062
Points 65,641, Level 100
Points: 65,641, Level: 100 Points: 65,641, Level: 100 Points: 65,641, Level: 100
Level Up 0% Completed
Level up: 0% Level up: 0% Level up: 0%
Forum Activity 43%
Activity: 43% Activity: 43% Activity: 43%
FF Reputation: 158 1turbofocus Excellent Standing Member 1turbofocus Excellent Standing Member
Buy-Sell-Trade Rating: (29)
Why do you feel your old PCM is bad ?

Tom
__________________
Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance!

Customer Support
AIM: hpdyno
Email:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Phone: 704-249-3745
Site:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Elder 1turbofocus
1turbofocus is offline  
    Reply With Quote Quick reply to this message
Old 05-18-2016, 10:15 PM   #6
Focus Rookie
 
Join Date: May 2016
Fan#: 304305
Location: savannah, GA
What I Drive: brown, 2007 SES

Posts: 11
Points 42, Level 1
Points: 42, Level: 1 Points: 42, Level: 1 Points: 42, Level: 1
Level Up 84% Completed
Level up: 84% Level up: 84% Level up: 84%
Forum Activity 8%
Activity: 8% Activity: 8% Activity: 8%
FF Reputation: 1 bryesh Good Standing Member
Buy-Sell-Trade Rating: (0)
Thanks for all the replies, I'm very interested in getting forscan. Has anyone used it? I couldn't find out how much it costs. Also, in reading the documentation, I'm not 100% convinced it will work without having a working key. Once I switch to the new computer I will not have a recognizable key.


The story with the PCM is that my car is a PZEV and the smog pump seized because it was full of water and corroded the bearings. I replaced it, but it still won't turn on. I can ground the relay in the fuse box under the hood and the pump will now run whereas before it didn't. So everything is good up to that wire, and as far as I know the only place it goes is right to the computer. So the way I see it there are 3 possibilities:

1. That circuit going from that relay to the computer is bad.
2. The computer is bad (probably fried internally when the PZEV pump seized)
3. The computer is intentionally not turning on the smog pump.

I don't think 3 is likely because I'm getting a low secondary air code (and echeck hates codes), so the computer thinks it's turning on the pump. Let me know what you guys think.

So to test 1 and 2 the plan is to pull the computer, test continuity of said circuit and if it's good proceed to replace the PCM. I had the same thing happen with the EGR valve on my excur
bryesh is offline  
    Reply With Quote Quick reply to this message
Old 05-18-2016, 10:25 PM   #7
Elder
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Lockport, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 39,047
Points 27,917, Level 98
Points: 27,917, Level: 98 Points: 27,917, Level: 98 Points: 27,917, Level: 98
Level Up 57% Completed
Level up: 57% Level up: 57% Level up: 57%
Forum Activity 100%
Activity: 100% Activity: 100% Activity: 100%
FF Reputation: 125 sailor Excellent Standing Member sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
General Tech Chat is a good place to start a new thread on the specific code, and/or look for more info. on that system in the stickied code listings & prev. threads on it's problems.

Offhand there's also an air valve involved as well, prob. more as I can't remember all the details. Pump doesn't run a lot, primarily during warm up to help heat up the CAT.
__________________
"Rubber Side Down"

S.R. #275
Focus Takeover #003 / Tarbo Fan #003
sailor is offline  
    Reply With Quote Quick reply to this message
Old 05-19-2016, 12:04 AM   #8
FF Affiliate
 
1turbofocus's Avatar
 
Join Date: Oct 2003
Fan#: 1123
Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

Posts: 26,062
Points 65,641, Level 100
Points: 65,641, Level: 100 Points: 65,641, Level: 100 Points: 65,641, Level: 100
Level Up 0% Completed
Level up: 0% Level up: 0% Level up: 0%
Forum Activity 43%
Activity: 43% Activity: 43% Activity: 43%
FF Reputation: 158 1turbofocus Excellent Standing Member 1turbofocus Excellent Standing Member
Buy-Sell-Trade Rating: (29)
Is this car new to you ? could be turned off in a tune , I know there is criteria s that have to be met to make the thermactor pump in the pass fender come on

I would not think this is a ECU issue make sure the ecu codes match if you still go to change it

Tom
__________________
Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance!

Customer Support
AIM: hpdyno
Email:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Phone: 704-249-3745
Site:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Elder 1turbofocus
1turbofocus is offline  
    Reply With Quote Quick reply to this message
Old 05-19-2016, 12:06 AM   #9
Focus Fanatic
 
Join Date: Mar 2012
Fan#: 96610
Location: Fort Worth, TX
What I Drive: 00 wagon, 02 sedan both zetec atx

Posts: 10,328
Points 6,091, Level 50
Points: 6,091, Level: 50 Points: 6,091, Level: 50 Points: 6,091, Level: 50
Level Up 71% Completed
Level up: 71% Level up: 71% Level up: 71%
Forum Activity 100%
Activity: 100% Activity: 100% Activity: 100%
FF Reputation: 54 amc49 Excellent Standing Member
Buy-Sell-Trade Rating: (0)
'I can ground the relay in the fuse box...'

More than one way to ground a relay and could be your issue.....................you can ground the coil or the load..................two different things and one may not involve the PCM at all.
amc49 is offline  
    Reply With Quote Quick reply to this message
Old 05-19-2016, 09:21 PM   #10
Focus Rookie
 
Join Date: May 2016
Fan#: 304305
Location: savannah, GA
What I Drive: brown, 2007 SES

Posts: 11
Points 42, Level 1
Points: 42, Level: 1 Points: 42, Level: 1 Points: 42, Level: 1
Level Up 84% Completed
Level up: 84% Level up: 84% Level up: 84%
Forum Activity 8%
Activity: 8% Activity: 8% Activity: 8%
FF Reputation: 1 bryesh Good Standing Member
Buy-Sell-Trade Rating: (0)
Thanks tom, I bought the car new so it's not the tune. The codes match.

Thanks amc49. I understand what you are saying but if I'm not mistaken, the secondary air relay supplies 12v to the pump. Therefore, there is only 1 wire of the 4 that when grounded will close the relay and turn that pump on.

That is the wire that the computer is supposed to ground to start the PZEV pump after a cold start. The relay never sees a ground so the pump doesn't turn on.
bryesh is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
What I Drive
Year, color, and model of your car. Example: 2003 Pitch Black ZX3
Name
Your real name.
City
State
Country
Insurance
Please select your insurance company (Optional)

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 04:06 PM.


Copyright 2002-2015 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Mazda CX-3, Audi S3, Mazda MX-5 Miata and Acura TLX. You can find all Ford Focus, Focus ST and Focus RS related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. If you own other makes have a look at Challenger Hellcat Forum, Charger Hellcat Forum, Cadillac ATS-V Forum, Cadillac CTS-V Forum, Lexus RC-F Forum, Lexus GS-F Forum, Mercedes GLA Forum, Mercedes GLE Forum and Volvo XC90 Forum.




 

Search Engine Optimization by vBSEO 3.6.1