• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Computer replacement does NOT convince truck to start


magrasjc

Member
Joined
Jul 13, 2018
Messages
58
Reaction score
1
Points
8
Location
Austin, Texas
Vehicle Year
2004
Make / Model
Ford
Transmission
Automatic
Hello!
More turnover drama with my 2004 3.0L v6.
I changed the computer (NC exchange gave 2 keys) because its 158k and because that vehicle/lock light was flashing for months.
After the replacement, engine will still silently not turn over but will shut down the heater if the heater is on. The accessories will lite up.
The vehicle lock lite seems to flash more slowly but that's all .
I have a multimeter available.

Thx in advance,
JC Magras
 


Rock Auto 5% Discount Code: 70D65189E6D8FF: January 5th, 2022

fastpakr

Forum Staff Member
Forum Moderator
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
6,737
Reaction score
1,625
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16
Have you programmed your keys into the new computer?

Also - how did you diagnose that the computer needed to be replaced?
 

Dirtman

Former Middleweight Moss Fighting Champion
Supporting Member
Joined
May 28, 2018
Messages
19,344
Reaction score
13,286
Points
113
Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
My credo
I poop in the furnace.
Im pretty sure in 2004 is when they switched to the digital controlled instrument cluster. The instrument cluster needs to be paired to the computer as well or the PATs system will not allow the vehicle to start. The computer, transeiver, key transponders, AND instrument cluster all need to be paired. The cluster can only be paired by the dealer.

Verify you indeed have the digital instrument cluster, if you do... To the dealer you go.

The PATs system is a pretty iron clad security system. It can be very annoying to work with but if you could just swap parts it wouldn't be much of security system.
 
Last edited:

magrasjc

Member
Joined
Jul 13, 2018
Messages
58
Reaction score
1
Points
8
Location
Austin, Texas
Vehicle Year
2004
Make / Model
Ford
Transmission
Automatic
Can a locksmith do it?

The replacement of the computer was part of an overhaul strategy of an oroginally indeterminate date.
The replacement of the computer was moved up when replacement of fuel injectors left me with a dead truck.
At least one of the two copackaged with the computer keys was programmed. I gave the computer exchange company in NC my odometer reading.
Was that key programming deliberately incomplete?

Thank in advance,
JC Magras
 

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,623
Reaction score
3,566
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
Was that key programming deliberately incomplete?
If by deliberately incomplete you mean they decided to only do part of the job, then no, it was not.

If you mean that they programmed the keys into the computer but didn't finish the job and knew that, then yes. But they can only do it part way without the whole vehicle.
 

fastpakr

Forum Staff Member
Forum Moderator
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
6,737
Reaction score
1,625
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,623
Reaction score
3,566
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
Why is that?
PCM has to recognize keys. Instrument cluster (or PATS module on earlier ones) has to recognize PCM, and vice versa. The whole job can't be done without the IC or PATS module.
 

fastpakr

Forum Staff Member
Forum Moderator
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
6,737
Reaction score
1,625
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16
Oh right, forgot about the digital cluster.
 

RonD

Well-Known Member
Joined
Jun 2, 2012
Messages
20,370
Reaction score
4,070
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
+1 on 2004 and up Rangers needing new computer paired with current instrument cluster, and PATS keys added after computer is installed

2004 and up have the computer(PCM) and instrument cluster "married" at the factory when the PATS keys are added, its an extra step, not part of the PATS key process.

This was added to prevent people from swapping in lower mile clusters on a high mile vehicle, which was a problem over the years with Fords.
So added layer of security.

And unmarried cluster and computer reacts the same as bad PATS, no crank, no start
No cluster would be the same, so you can't just unplug the cluster.

Whoever you got the computer from either didn't know this or failed to mention it :)


Only option is to tow vehicle to a Ford Dealer and have them setup the new computer, but they may say no, so call first.
Ford often wants original computer, it will verify current odometer reading on cluster, which is duplicated in the computer, and then want to sell you a new computer from Ford which will have odometer miles setup the same, depends on the Dealer.

Ford Dealers can not change odometer readings in cluster or computer, Ford Factory can and sends out replacement cluster and/or computers with matched miles
 

Dirtman

Former Middleweight Moss Fighting Champion
Supporting Member
Joined
May 28, 2018
Messages
19,344
Reaction score
13,286
Points
113
Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
My credo
I poop in the furnace.
No one ever listens to me...
 

fastpakr

Forum Staff Member
Forum Moderator
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
6,737
Reaction score
1,625
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16
Um... That's not actually true. As I said above, I forgot about the cluster integration in my previous post. Doesn't mean nobody read yours.
 

Dirtman

Former Middleweight Moss Fighting Champion
Supporting Member
Joined
May 28, 2018
Messages
19,344
Reaction score
13,286
Points
113
Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
My credo
I poop in the furnace.
Um... That's not actually true. As I said above, I forgot about the cluster integration in my previous post. Doesn't mean nobody read yours.
:icon_thumby: it's ok I still love you.
 
Last edited:

magrasjc

Member
Joined
Jul 13, 2018
Messages
58
Reaction score
1
Points
8
Location
Austin, Texas
Vehicle Year
2004
Make / Model
Ford
Transmission
Automatic
Hello!
Yes it's been a while and I got the computer swapped andcovert Ford married and blessed it.it starts but the light came back on.
Im going to replace the pats ring and keep all of you updated. Consider the fact that I got new keys out of it.
KNOW THIS: DO NOT DEAL WITH THE IMPERIAL COMPUTER EXCHANGE (Gary NC). Use all computer resorces near Sarasota FL. Imperial is more expensive too.
Thx ,
JC Magras
 


Top