EMan 928

I am removing the LAMBDA federalization emission computer box from my 85 Euro. It is connected to the car via the white connector below. Left side is from the car's harness, right side goes to the LAMBDA box. I need to jump the brown and purple wire on the left hand connector so I can disconnect the LAMBDA box and return the car to its normal Euro spec. I need the jumper to have male plugs. Are there particular male plugs that I need to use for this connector? I went to the local auto parts store and they didn't have anything that would fit.



Thanks in advance,

John Speake

If it's a standard Bosch 2 pin as used elsewhere on the car e.g. Temp 2 then you can obtain a matching male plug kit from Roger.

Picture ?

EMan 928

Thanks, John.

Just added pic to the original thread. I believe it would be a 6-pin.

John Speake

Can't really see the connector well enough to identify...

EMan 928

I will disconnect battery and unplug the connector and take a better picture for you.

Thanks!

Mrmerlin

Please dont start jumping wires..... wait and investigate.....

Ummm you ought to follow those wires and see where they go,
its quite likely that they terminate behind another bundle of wires and do absolutely nothing.

Of course I could be totally wrong but,
I have seen more than a few federalized cars with wires that go to out of sight then are not connected to anything.
Taking a few more pictures of the Lambda box and where the wires terminate would be helpful

EMan 928

Thanks, for the advice to verify where those wires are going, Stan!

Ok, here are some pictures.

The first picture is of the LAMBDA box and its harness to connect to the car. The yellow wire on this harness terminates to the white wire on the car's harness which then looks like it goes thru the firewall to maybe the O2 sensor at the time?

The second picture shows the LAMBDA box and the Bosch connector that is hooked up to the car. You can see the Red, Blue, Black, Purple, Brown and White wires going to the base of the CE panel where they are gathered and wrapped together with black electrical tape. From there, all of those wires travel behind the CE panel. The Red, Blue, Black, Purple and Brown wires go into the larger wiring harness that connects to the LH via the 25pin connector. As I mentioned before, the white wire leaves the firewall and I assume was for the O2 sensor.

The third picture is for something totally different. I took it because I wasn't sure where that white connector with the red and white wire was supposed to go, if anywhere. But, I thought you guys might know.

I have also included the installation instructions, from the company that originally made the LAMBDA computer, in a PDF (thanks Richard S!!). If you guys could take an look at those instructions and the pics and let me know if I'm on the right track of:

Disconnecting the battery

Disconnecting the Bosch connector from the LAMBDA box, and then removing the LAMBDA box

Jumping the Brown and Purple wires together on the car side harness, which If I'm right brings the wiring of the car back to its original configuration

Then I can adjust MAF for correct CO and tune as a normal Euro

Is there anything I'm missing? Should I be doing something with the Red, Blue and Black wires?

Also, if anyone knows the best way to jump the Brown and Purple wires (jumper needs to have to male ends) I would appreciate their input.

Thanks in advance, everyone!

John Speake

Can you share the installation instructions ? They would explain each wire's function. Then we can advise.

EMan 928

Thanks, John. The only instructions I have I included in my post as the pdf. Did you see that attachment?

John Speake

Sorry, missed the link. However the diagram is confusing (for me anyway). But I think you are safe to remove the box.

Then rejoin the cut original wire that is now connected to the purple and brown lanbda box wires.

EMan 928

I don't see the brown wire coming from the lambda box. There is a light peach (maybe light brown). If I rejoin the wire you speak of, would I still need to jump the brown and purple on the car harness side?

John Speake

Assuming you have found the purple wire, then note the color of the original harness wire that has been connected to it. Then see if that "light brown" wire is linked to an original wire of the same color.

If it is, disconnect the two new wires and rejoin the two original harness wires.

If it isn't the matching color, check out the other wires from the lambda box until you find the original wire of the same color as the previously identified wire. Double check carefully before committing yourself !

EMan 928

The "light brown wire" from the LAMBDA box goes to the dark brown wire of the car harness

The yellow wire from the LAMBDA box goes to the white wire of the car harness. That white wire is a little thicker than the other wires and actually is spliced into the black wire of the car harness as well. So, this white wire is connected to both the yellow wire and the black wire on the lambda harness. Would it be safe to say, since this bigger white wire leaves thru the passenger footwell, this two wire connection was for the O2 sensor?

Confused?? I am!!

Looking at the instructions, since they are asking to jump the brown and purple wires, are those the only two I need to be concerned with?


Does anyone have a wiring diagram of the harness that attaches to the LH? Maybe I can unwrap the section where the Red, Blue, Black, Purple and Brown come out and figure it out that way.

Mrmerlin

Does anyone have a wiring diagram of the harness that attaches to the LH? Maybe I can unwrap the section where the Red, Blue, Black, Purple and Brown come out and figure it out that way.
__________________

This might be a good idea^^^ to remove all of the wires and then verify that you have the correct pins in the correct connectors on the computers.
less chances to have smoke or computer damage occur

John Speake

So what wire of the car harness is connected to the purple wire ?