Fried ECU? Please help
Thread Starter
|
Senior User
Joined: May 2008
Posts: 374
Likes: 1
Okay, pin #20= .3ohms; #40= .1ohms; #60= .1ohms.
Also pin #1= 1.8ohms; #2= .9ohms; #6= .2ohms; #8= 1.1ohms; #10= 30.7ohms; #12= 12.5ohms; #16= .2ohms; #43= 4.3ohms.
To check the voltage coming and going to the tps and other sensors, does the connector need to be plugged in and stick the meter probe in the back of the connector or into the wire? I really hate piercing wires, but it does not look like there is any other way.
Thanks for the help.
Also pin #1= 1.8ohms; #2= .9ohms; #6= .2ohms; #8= 1.1ohms; #10= 30.7ohms; #12= 12.5ohms; #16= .2ohms; #43= 4.3ohms.
To check the voltage coming and going to the tps and other sensors, does the connector need to be plugged in and stick the meter probe in the back of the connector or into the wire? I really hate piercing wires, but it does not look like there is any other way.
Thanks for the help.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Couple of questions,
You have the battery disconnected and the PCM (EEC) connector off of the computer when you test them right?
Also the 302/351 wiring diagram shows pin #43 has nothing connected to it, no pin there. Where does it go to on your truck?
The book I have shows the 300/6 is the only truck where pin #43 is used, "A/C/HTR CTRL ASSY" is shown for that pin on trucks with that motor.
Curious as to why its used on yours with the 351. Keep in mind my book has been wrong on wire color from time to time but the pinouts have always been right....up to now anyway.
You have the battery disconnected and the PCM (EEC) connector off of the computer when you test them right?
Also the 302/351 wiring diagram shows pin #43 has nothing connected to it, no pin there. Where does it go to on your truck?
The book I have shows the 300/6 is the only truck where pin #43 is used, "A/C/HTR CTRL ASSY" is shown for that pin on trucks with that motor.
Curious as to why its used on yours with the 351. Keep in mind my book has been wrong on wire color from time to time but the pinouts have always been right....up to now anyway.
Thread Starter
|
Senior User
Joined: May 2008
Posts: 374
Likes: 1
danr1, I disconnected the battery and pulled the ecu connector off to test the resistance. I connected the battery and tried to test voltages with the ecu connector disconnected but none of them made sense (I suppose the terminals would need to be connected to the ecu to complete the circuits). And I don't know what pin 43 goes to either, I may need to do some research on that one.
netscaner, I have been afraid to run it any more until I find something burnt somewhere. I had it idling before when I fried the first computer. I have drove it several miles with the new one, but now that I have thought about it I am trying to not start it. I don't even leave the battery connected unless I am testing something.
netscaner, I have been afraid to run it any more until I find something burnt somewhere. I had it idling before when I fried the first computer. I have drove it several miles with the new one, but now that I have thought about it I am trying to not start it. I don't even leave the battery connected unless I am testing something.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Pin #26 VREF brn-wht wire to TPS
pin #47 TP gry=wht wire to TPS
I'll post the TPS test, give me a minute to find it.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
You need to check the wires for continuity with the battery disconnected, no power can be present.
Test the 3 pins that ground the computer again 20,40 and 60 with the battery disconnected, see what you get then.
Test the 3 pins that ground the computer again 20,40 and 60 with the battery disconnected, see what you get then.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
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
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Pin 43 on a 5.8 in 1992 is the A/C Panel Input and the wire color is Purple (may look brown).
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Haynes manual for ya! lol
Thread Starter
|
Senior User
Joined: May 2008
Posts: 374
Likes: 1
I did test pins 20, 40, and 60 with the negative disconnected and they showed good. The only manual I have is the Haynes. The wiring diagram does not show a pin 43 for the 1992 model, but it does for the 1991. When I was calling around to junk yards looking for a computer, several of them told me from the numbers I gave them from the ecu that it was a 1991 model. Yet the title says 1992. It has a build date of 8/91.
I am going to test the tps as you all have described. It may be a few days before I have time again. I certainly appreciate all the help.
I am going to test the tps as you all have described. It may be a few days before I have time again. I certainly appreciate all the help.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
I did test pins 20, 40, and 60 with the negative disconnected and they showed good. The only manual I have is the Haynes. The wiring diagram does not show a pin 43 for the 1992 model, but it does for the 1991. When I was calling around to junk yards looking for a computer, several of them told me from the numbers I gave them from the ecu that it was a 1991 model. Yet the title says 1992. It has a build date of 8/91.
I am going to test the tps as you all have described. It may be a few days before I have time again. I certainly appreciate all the help.
I am going to test the tps as you all have described. It may be a few days before I have time again. I certainly appreciate all the help.
You just have to make sure they have the same Program code and they can have different part numbers with the same program code.
Even if it is from the same year & make, make sure the program code is the same or you will have problems.
Thread Starter
|
Senior User
Joined: May 2008
Posts: 374
Likes: 1
It is supposed to be the same program code. I thought the "A2Z" number meant something but no one I called cared about that number. They said the last two letters (CA) was the program code. Anyway, everything runs perfectly for several minutes until something goes hay-wire.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
It is supposed to be the same program code. I thought the "A2Z" number meant something but no one I called cared about that number. They said the last two letters (CA) was the program code. Anyway, everything runs perfectly for several minutes until something goes hay-wire.
Go to this URL for more information:
Ford Fuel Injection EEC Program Codes