TB42 Auto box Electricals?

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29th April 2012, 02:49 PM
taslucas

Quote:

Originally Posted by ripper

I'm not so sure. Getting up to operating temp only takes about 10 min. These electronic boxes really can be temperamental.
Have you got a new error code since the temp sensor went in, to narrow down which circuit is the problem?

Yeah that's the thing though, I drive for about 15-20 minutes before I yet to the first 100 km/h straight. So the box should be up to operating temp. Get onto the straight, TC locks up, revs drop to around 1800rpm and all works like it should. Then after a bit more windy roads I get onto the highway, get up to 90 and the damn TC locks and unlocks rapidly......

As I've said, the most puzzling thing is if I'm parked near the hwy and start up and get straight onto the hwy I can sit on 90/100/110 for over an hour with all working fine but as soon as I stop for 5 minutes and go again, the problem appears ad soon as I get to 90.......

tappin it
30th April 2012, 08:42 AM
taslucas

Quote:

Originally Posted by ripper

I'm not so sure. Getting up to operating temp only takes about 10 min. These electronic boxes really can be temperamental.
Have you got a new error code since the temp sensor went in, to narrow down which circuit is the problem?

Just checked the fault codes again, it's the same code, which is : "inhibitor switch, power shift switch, kickdown switch or idle switch circuit is disconnected or the control unit is damaged"

But I've got no idea how to check/fix any of these!

tappin it
30th April 2012, 09:55 AM
ripper

Lucas, fixing this is going to be a real pain.

Do you have a copy of Nissan's workshop manual?

Do you have good skills with a multi meter, or a helpful auto electrician?

I've just been looking at which pages of the manual you're going to need, and it looks ugly already.
30th April 2012, 11:04 AM
taslucas

Quote:

Originally Posted by ripper

Lucas, fixing this is going to be a real pain.

Do you have a copy of Nissan's workshop manual?

Do you have good skills with a multi meter, or a helpful auto electrician?

I've just been looking at which pages of the manual you're going to need, and it looks ugly already.

Lol, yeah it's been a pain already!

I got some instructions from wholesale autos on how to test the tcu with a multimeter but I'm not very confident at all in doing it. I also don't have much confidence in the auto electricians around here.

tappin it
30th April 2012, 11:34 AM
taslucas

Are you talking about the manual that can be downloaded from this site?

tappin it
30th April 2012, 12:20 PM
ripper

Quote:

Originally Posted by taslucas

Lol, yeah it's been a pain already!

I was thinking that as I wrote it, but now it's going to take lots of testing, where as the shop's approach seems to have been 'throw money at it and hope for the best'.

Quote:

Originally Posted by taslucas

I got some instructions from wholesale autos on how to test the tcu with a multimeter but I'm not very confident at all in doing it. I also don't have much confidence in the auto electricians around here.

tappin it

I ended up working out what was wrong with mine myself, when the automatic shop hadn't been able to, and the auto elect. said he couldn't do any more than what the auto shop could.

To sort this out you're going to need someone with multimeter skills. Is there and electrician (a domestic or industrial one I mean) in your area who can think outside the box? Some just shut down as soon as you mention anything to do with DC wiring.

Quote:

Originally Posted by taslucas

Are you talking about the manual that can be downloaded from this site?

tappin it

Yes, that one, or a paper copy of it.
30th April 2012, 12:52 PM
taslucas

Quote:

Originally Posted by ripper

I was thinking that as I wrote it, but now it's going to take lots of testing, where as the shop's approach seems to have been 'throw money at it and hope for the best'.

Not really. Everyone I have asked (including wholesale autos) has said
that it must be the TC, the tps or the temp sensor. So I have methodically changed those things one at a time. Another thing is that when the secondhand temp sensor was fitted, the problem went away instantly and completely for 6 weeks.....

I will go to all the auto electricians around here and have a good chat to see if any of them are willing to have a go....

tappin it
30th April 2012, 01:25 PM
ripper

Quote:

Originally Posted by taslucas

Not really. Everyone I have asked (including wholesale autos) has said
that it must be the TC, the tps or the temp sensor.

But your error code is saying
"inhibitor switch, power shift switch, kickdown switch or idle switch circuit is disconnected or the control unit is damaged"

Why weren't those eliminated first?
30th April 2012, 02:40 PM
taslucas

First off the auto specialist test drove it and said the TC is stuffed, and it was so we replaced that, then he test drove again and thought it didn't feel right so had a closer look and found the tps was missing, then found it was missing because it had a carby off a manual in it so no place fir the tps. At that stage the error code was showing "problem with the tps circuit". Got another carby, fitted it with a new tps and the code went away but problem still there. Pulled box out to thoroughly check the internals, box was in awesome condition, auto specialist said it looked like it had dine less than 5000ks since a reco. Decided to fit a nomad valvebody while it was out. Put all back together, still had the problem but showing no error code. Tested temp sensor and found it was faulty. Put a second hand one in and the problem was gone completely (also no codes showing). 6 weeks later the problem came back and now showing that error code........ So I thought well maybe the second hand temp sensor had failed so I got a brand new Nissan genuine one fitted and still got problem.......

tappin it
30th April 2012, 03:05 PM
ripper

Okay, makes more sense now. I didn't realise there was no error code earlier on.

Your box sounds as frustrating, or maybe even more frustrating, than what ours was. From the first time I pulled our box out (I did it twice, and the shop did it once as well), till it was finally fixed took more than 10 months.

I still think you need to get someone who's handy with a multimeter, and get them to trouble shoot the error code with the instructions in Nissan's workshop manual.

Quote:

Originally Posted by taslucas

I will go to all the auto electricians around here and have a good chat to see if any of them are willing to have a go....

If that doesn't work, electricians, or electronics repairers, or maybe even someone who builds PCs, could do the job too.

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