89 FJ62 wire question

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C

chicagoinstaller

Joined
Oct 4, 2005
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I dont have this car, its a question for my brother in law..

Not exactly the handy man on this vehicle....In fact im helping him out this weekend on a trip out to California from Chicago.....This is what I got sent in an Email...

The landcruiser is a 1989 FJ-62. The coaxial cable is about a 1/8 inch
diameter that needs to be cut and spliced back together. It has
something to do with the electronic emissions system.

This makes me wonder 2 things....1 Why does he want to cut and splice this and what the cable is for and what does it control.....

Any ideas.......Im proficient in automobile audio and electronics but with a forum like this im sure I can get either a warning or advice on what this wire may be.
What questions also should I ask before I go??

Thanks
CI
chicago,IL
 
I'll bet he's talkin' 'bout the heat sensor wires on the cats, they are the only thing that comes to mind that looks like coaxial cable.
Butch
 
Texican said:
I'll bet he's talkin' 'bout the heat sensor wires on the cats, they are the only thing that comes to mind that looks like coaxial cable.
Butch
Click to expand...

Don't believe there are heat sensors on the FJ62 cats. Only thing down there are the O2 sensors and their leads don't look like coax.

Bill
 
Approximately where on the vehicle is this wire located and can he identify the "devices" on either end of said wire? Coax is typically used when a shielded signal wire is needed, the only one I know of on my 62 is between the antenna and the radio, and should not ever need cut as it is easy to disconnect at either end.
 
I passed on the responses and am currently waiting for the why and where of the wire....

Hoping to avoid cutting and splicing of anything, I know what bare wires and spliced points turn into after time....
 
billmc said:
Don't believe there are heat sensors on the FJ62 cats. Only thing down there are the O2 sensors and their leads don't look like coax.

Bill
Click to expand...

I just wrecked one out this past weekend, an 88 model and it had one in front of each cat..... :D
 
Texican said:
I just wrecked one out this past weekend, an 88 model and it had one in front of each cat..... :D
Click to expand...

I got the email today in reply to all your questions....

A 30" long arm of the wiring harness was destroyed when it unknowingly fell
against the exhaust manifold. This run of wires goes to an O2 sensor located
at the exhaust system just before the catalytic converter. Within this
bundle of wires are two approximately 1/8" diameter wires that I believe are
coaxial and four smaller standard wires. It appears that the two 1/ 8" wires
tie into the other four hidden within the casing just before they reach the
plastic connector. I have located another harness from our local cruiser
guru Gary Kardum/ Mudraks. I now need to splice in and replace the destroyed
section. Any advice is greatly appreciated.

He's asking me due to a lack of knowledge of any wiring for the most part....
He enjoys the truck but doesn't get into the inner workings too much except for occasional bad luck or a broken part.

I need to bring some tools when I fly out for a family trip....
The usual maybe
solder pen/solder
shrink tube
heat gun
some extra wire???


Thanks
Its my first day and you guys have made it easy to find tech advice.
 
Timoss said:
So what's the question? If he's got the new section of the wiring and he knows where it goes, what more does he need to know?

Tim
88 fj62 TLCA
Click to expand...

Possibly the original questions.........

The landcruiser is a 1989 FJ-62. The coaxial cable is about a 1/8 inch
diameter that needs to be cut and spliced back together. It has
something to do with the electronic emissions system.

This makes me wonder 2 things....1 Why does he want to cut and splice this and what the cable is for and what does it control.....
 
I know what the guy is talking about because I have a similar problem. The wires going to the O2 sensors appear to be 4 small wires at the plug but up the harness a bit there are wires that are coaxail like. There is an inner wire surrounded by insulation and an outter wire around that, with more insulation around it. By insulation I mean the plastic or rubber compound you find on any standard automotive or electronic wire. I believe that these are part of the pre-heater for the O2 sensors.

I had my forward O2 sensor wires cooked. The insulation was melted and the wire somewhat corroded. I found this when replacing my exhaust system. I am stunned that I did not get any CEL codes with the wire in this condition. But as soon as we fired up the truck after completely replacing the exahust from the manifolds back (inside frame rail, dual inlet single outlet cat, 2.25" to cat 2.5" after, re-used original O2 bungs, etc) I got the CEL (check engine light) and pulled O2 codes.

I dug into the wire thinking no problem splicing when I found the coaxial complications. I opened up the rear O2 sensor harness to make sure how it is wired and re-wired the front harness the same. I cleared the codes and still get O2 codes. So I swapped back in my original O2 sensors. Then I get codes 25 and 26 which are, I believe, the sensors themselves rather than the code I got before which was more general O2 sensors or wiring or heaters or something. I will look at my FSM and re-post with the actual code.

The replacement O2 sensors I have I purchased from another 3FE lister who said they were OEM but without the original plugs. They are not OEM nor OE as far as I can tell and are much smaller than the originals. Several of my friends run such O2 sensors without problems. The exhaust shop slapped on red silicone appearing goo to seal the O2 sensors to the bungs. I read in the paperwork that came with the sensors to not use any silicone based sealer as that can destroy the sensor and the copper washer is enough to seal.

So I slapped in my original O2 sensors that were in when I got the truck with 89k miles and were still functioning at 240k miles. I guess that I am going to punt and order some original O2 sensors and see if that cures the codes. If not I will be looking to do exactly what our friend here is trying to do which is splice in a replacement O2 lead. Looks like a bitch. I have not unwraveled the haness that this lead goes into to see what happens.

Perhaps Texican can look at the harness of the scrapped out 62 and tell us where and how to wire the thing in. Its got to be easier than replacing the whole trucks wiring harness.

Dunbar
 
I see I have my work cut out for myself, as I have never seen any of these wires that he is refering to.

I am hoping only to give some better than average electrical knowledge and maybe to make due of a less than perfect situation.

I do so appreciate the insight and when I do get to Cali and attempt this I will reply and post my findings as well as tghe outcome....

If Texican does some disecting of some old donor parts hopefully he can share some more light on the insides of these wires.....
 
chicagoinstaller said:
If Texican does some disecting of some old donor parts hopefully he can share some more light on the insides of these wires.....
Click to expand...

Mine are intact, I'm not inclined to cut them open to see :D

The FSM on a 91 3FE shows 2 wires ging to each O2 sensor........I don't have an FSM handy for the older ones.......my thoughts is maybe what you are thinking is coaxial is actually heat shielding.......but I could be wrong :confused:
 
Texican said:
I just wrecked one out this past weekend, an 88 model and it had one in front of each cat..... :D
Click to expand...

Texican,

What about this rig? Do you still have the remains and are the O2 wire leads still there? If you open one up about a foot above the sensor you will see what we are talking about when we say coaxial. There is a wire of about 18 gauge with more copper wire encircling it on the outside with another layer of insulation around that. It does not look like TV cable but is constructed in a similar fashon.

If you have said rig still and find 5 minutes to see where these wire go upstream it would be interesting. The best would be a plug inside the wire wrapping on the harness somewhere. Then we could obtain a new lead and plug it in. Doubtfull for sure.

Thanks,
Dunbar
 
Dunbar said:
Texican,

What about this rig? Do you still have the remains and are the O2 wire leads still there
Dunbar
Click to expand...

I looked, there are 4 wires inside a braided steel/rubber covering, so it is just heat/abrasion protection, splice them back and you should be golden.
Butch
 
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