Help Me Find OctAdj Shorting bar (EFI)

[Lon L]

%) Hello guys.
Once again I need the help from the Gurus of Bronco EFI 5.0 .
I am receiving some codes and timing retardation . the codes seem to indicate that the shorting bar is not connected. Well , I cannot locate a shorting bar on my Harness. I am not certain if the PO had it on there or not. I do know that I did not see these codes until after a recent visit to the shop where the NV3550 was removed, 4R70W installed as well as removal of EGR assembly and Exhaust Manifold. Ceramic Headers , each with new o2 sensors and I verified 12 volts at both sensors with engine running.

I will post some pictures and ask your help to locate the missing shorting bar, and to Identify the 2 cut hoses and 1 Vacuum line which I believe to be remnants of EGR removal. They had electrical tape on the ends %)

Lastly, there is a flat and fairly thin plastic rectangle approx. 3"x2" with 2 wires that are tapped into the small sensor in the Air Intake.

There is an RPM switch that is mounted nearby, but that is just to kill power to AC compressor over 3000 RPM.


Anyway, sorry for the long post, but if you took the time to read it to this point, I want to say "Thank You"

I am adding pics here, but thy are in my Gallery as well I think the resolution might be higher and better for zooming.

 

[Lon L]

More Pics

 

[Timmy390]

Think it should be up near the coil pack D-side around the #5 injector. Plug should be black with a gray jumper in it.

Tim

 

[Lon L]

Think it should be up near the coil pack D-side around the #5 injector. Plug should be black with a gray jumper in it.

Tim

I looked pretty hard and I just don't see it or even a place where it might have been cut.

 

[garberz]

Think it should be up near the coil pack D-side around the #5 injector. Plug should be black with a gray jumper in it.

Tim

This^^ It has two wires, one is Dark Green, the other is Gray/Red.

Mark

 

[Lon L]

This^^ It has two wires, one is Dark Green, the other is Gray/Red.

Mark

Thanks for the help, EFI_Guy {Garry} examined the pics and he and I have determined it just isn't there. however he did give me an easy remedy (jumper pin 30 to pin 91 on the PCM) so I will do this today and hopefully rid myself of that code. I still have some issue with the o2 heater circuits, that I will try to troubleshoot today as well.

I hope to have good news to report later

 

[hankjr]

Are shorting bars standard? Funny that this is the first mention I have seen in nearly three years of EFI reading.

Anyone got a photo of one?

Thx

Hank

 

[Timmy390]

My 96 5.8L donor van had it. Here is a pic (not mine) see post #2. This is how it looks on a remote TFI

http://www.ford-trucks.com/forums/6...nector-e150-e-150-5-0-5-0l-302-94-1994-a.html

Tim

 

[Lon L]

No update yet. Today was very hectic and I didn't even get to see the Bronco much less diagnose it .

Garry, if you see this.... Best way to Jumper 30 to 91? just tap into or is it best cut the wires and solder them together?

I am pretty certain that I have all day tomorrow for myself... I hope to have a good update then

BTW Garry, I do believe the harness is from a 98. here is a pic of the wires I believe I need to jumper

 

[Steve83]

I am receiving some codes...

Exactly which codes, and what's the complete definition for each one?

...and timing retardation .

What does that mean? Are you measuring timing somehow as you drive? It's normal for the timing to change continuously.

the codes seem to indicate that the shorting bar is not connected.

"Seem"? What exactly makes you think that?

Well , I cannot locate a shorting bar on my Harness.

Then it probably wasn't built with one, and you probably should short any wires together. Before you damage something, I suggest you use the PCM's label info to find out what vehicle used it (year, engine, trans, options, etc.), and then find a wiring diagram (free http://www.revbase.com/BBBMotor/Wd) or EVTM ($10-50 on eBay) for that vehicle.

...Identify the 2 cut hoses and 1 Vacuum line...

The hoses go to the DPFEGR sensor, which is still mounted to the back of the plenum. A green vacuum tube is always for the EGR on a Ford engine.

Lastly, there is a flat and fairly thin plastic rectangle approx. 3"x2" with 2 wires that are tapped into the small sensor in the Air Intake.

It's some aftermarket device - you'll have to inspect it carefully for markings that might help ID it.

You should also be VERY concerned about those 2 red ScotchLoks in photo 026, and the yellow one in 016.

Are shorting bars standard? Funny that this is the first mention I have seen in nearly three years of EFI reading.

Very few vehicles were built with an OCTADJ circuit in the harness, or an EEC/PCM programmed to use it.

 

[Lon L]

Exactly which codes, and what's the complete definition for each one?

DTC P1390: VISUALLY INSPECT OCTANE ADJUST IN-LINE CONNECTOR


is the one that retards the timing.


DTC P0155 HO2S Heater Performance Bank 2 Sensor 1

is the other code as well as one more like above for sensor 2.


What does that mean? Are you measuring timing somehow as you drive? It's normal for the timing to change continuously."Seem"? What exactly makes you think that?Then it probably wasn't built with one, and you probably should short any wires together. Before you damage something, I suggest you use the PCM's label info to find out what vehicle used it (year, engine, trans, options, etc.), and then find a wiring diagram (free http://www.revbase.com/BBBMotor/Wd) or EVTM ($10-50 on eBay) for that vehicle.The hoses go to the DPFEGR sensor, which is still mounted to the back of the plenum. A green vacuum tube is always for the EGR on a Ford engine.It's some aftermarket device - you'll have to inspect it carefully for markings that might help ID it.

You should also be VERY concerned about those 2 red ScotchLoks in photo 026, and the yellow one in 016.Very few vehicles were built with an OCTADJ circuit in the harness, or an EEC/PCM programmed to use it.

I am worried about a few of those connections, I hope to get it cleaned up

 

[Lon L]

Arrrgh No Wire on Pin 30

I find out why I cant find the OCTadj shorting bar. It simply has no wire coming from pin 30, which is the wire that connects to one side of the shorting bar. I think I will try to clean up the wiring and reuse one of the Terminated wires that had been previously cut, but left in connector. I will place it in the connector for pin 30 and the other end to GND. If I understand it correctly that should remedy the PCM code for the shorting bar.


Also , I spoke with the Previous owner who did the conversion himself. He says the Computer and Wiring harness were from 1997 Mountaineer, he pulled them himself. He did use a Fuse Panel from a late model mustang. Also he told me that the square plastic dohicky was a present from his son and is supposed to help the MAF get better readings or something. I am going to have to research that, it may be best to remove it from the equation.

 

[Steve83]

If the harness & PCM came from a vehicle withOUT the OCTADJ circuit, then adding a terminal there will have no effect on anything.

If you're getting a code for something the PCM isn't programmed for, then the PCM is faulty, or you're looking at the wrong definition for that code. Some code numbers have slight variations in definition based on the vehicle, so try to find a code list SPECIFIC to the PCM donor vehicle.

 

[Lon L]

After more hours of research , looking at diagrams, TSB's and manuals. It appears to me that the harness is from a 97, but for a 4.0L. the pins in the connector {pin 4-12}
are missing and still sealed with plastic ; this matches a 97 4.0L EEC connector.

So I guess now I have to go through and see if any other wires are missing or in the wrong pin.
I am looking to see if I can locate a correct harness, if I can I will most likely go that way.