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ASCD wiring

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Old Jul 23, 2005 | 12:04 PM
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ASCD wiring

I've read and understood the wiring of the ASCD (cruise control), but it only covers the ASCD itself. It ends with 'going to A/T control unit'.

I'm suspecting the ASCD is wired from the A/T control unit into the auto trans then back. So two of the cables from the F21 harness probably needs to be shorted to get ASCD working (now after the 5spd swap). I've already hooked up the reverse lights and got it working. Will do a writeup about that later if anyone should be interested.

In the F21 harness there are 3 connectors. One is for revolution sensor; Not used anymore. One is for solenoids; Not used anymore.

Then there are two others that the FSM is referring to as 'Inhibitor switch harness connector'. One connector contains 3 cables where two are used for the position sensor (short the red and one green, second green is unused). The other connector contains 6 cables where two are used for reverse lights (red and one green as well) and the other four is now unused (1 green, 3 yellow).

My guess is that two of these four cables are the ASCD. But I can't find anything about that in the FSM. AT ALL. Annoying. I've been through the AT section and the EL section and they all keep referring back to each other. In the other end waits two cables from the manual trans that I bet is suppose to be used for the ASCD. I could of course try cable by cable but I prefer knowing before doing...



This is not a very good picture, and unfortunally the pics in this post can no longer be seen... http://forums.maxima.org/showthread.php?t=404084
Does anyone have a picture or something that explains what all the cables are for? Or does anyone know what they're all for?

Much obliged
Old Jul 23, 2005 | 04:58 PM
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I think Chris would be the man for this subject... haven't seen him around in awhile, anyone know where he went?
Old Jul 23, 2005 | 05:41 PM
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have u tried askin' Craig B??? i know he can try to help u out. i need to look into this as well for my '93 cuz i still need my reverse lights to work and cruise control as well. but good luck and try to do that write up for the reverse lights soon cuz im gonna need it.
Old Jul 24, 2005 | 12:00 AM
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Originally Posted by Phatsta
I've read and understood the wiring of the ASCD ....
- is your ASCD connector [pin qty?] equal to the 94 fsm? mine is not...
- one thing is extraordinary in u system: oil oozing out from u connectors
- info in fsm does not explain the global version of harness connectors
- cant u compare this to the car where u have taken this tranny?
Old Jul 24, 2005 | 01:07 AM
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Originally Posted by Wiking
- is your ASCD connector [pin qty?] equal to the 94 fsm? mine is not...
- one thing is extraordinary in u system: oil oozing out from u connectors
- info in fsm does not explain the global version of harness connectors
- cant u compare this to the car where u have taken this tranny?
Hmm... never thought they were different... I'll have to check that but I think so... strange.

Yeah I like ATF oil hehe I've cleaned them now, that pic was taken before the swap. I've drowned them in 5-56 spray

no the fsm seems to have left out these connectors all together... just my luck

I will have to, yeah. Or something. I'm really out of ideas. Or I'll just try hooking them up one by one until it works. Hope I don't short something...
Old Jul 24, 2005 | 01:12 AM
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Originally Posted by GRNMAXDMON
have u tried askin' Craig B??? i know he can try to help u out. i need to look into this as well for my '93 cuz i still need my reverse lights to work and cruise control as well. but good luck and try to do that write up for the reverse lights soon cuz im gonna need it.
No I haven't. I will though

Yeah no probs... I'll try to do that write up later on today if I only get the ASCD working.
Old Jul 24, 2005 | 01:13 AM
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Originally Posted by Phatsta
...Hope I don't short something...
Use 390ohm, 1k or whatever resistor to pull a signal up -or- down. In the KS bypass .5Mohm does the trick...
Old Jul 24, 2005 | 01:15 AM
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Originally Posted by Wiking
Use 390ohm, 1k or whatever resistor to pull a signal up -or- down. In the KS bypass .5Mohm does the trick...
I don't have any equipment to measure that stuff, and even if I did I wouldn't know how. I just cross the cables and try the function
Old Jul 24, 2005 | 01:20 AM
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Originally Posted by Phatsta
I don't have any equipment to measure that stuff, and even if I did I wouldn't know how. I just cross the cables and try the function
No hauhau: tio kronor multimeter is a must. Ol radio or whatever scrap has resistors. Take one, weld into wire end. Connect that to ground. Does it work? No. Connect that into +12V. Does it work? No. Well, at least u have tried...
Old Jul 24, 2005 | 01:28 AM
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Originally Posted by Wiking
No hauhau: tio kronor multimeter is a must. Ol radio or whatever scrap has resistors. Take one, weld into wire end. Connect that to ground. Does it work? No. Connect that into +12V. Does it work? No. Well, at least u have tried...
I don't understand... what does that really tell you? That it's working or not working yes, but it doesn't tell you what the cable's connected to?
Old Jul 24, 2005 | 01:50 AM
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Originally Posted by Phatsta
I don't understand... what does that really tell you? That it's working or not working yes, but it doesn't tell you what the cable's connected to?
I am talking of ECU -or- ASCD signal inputs now hanging in air. The computer reads signal levels, zero or 1. Via a resistor to +12V you can pull that signal up. Ground it via a resistor, u pull it down.

Testing both ways will tst the input both ways: 0 & 1. No harm done if computer does not function. But quite probably ASCD is waiting for some signal input to change.

Shorting computer wires has a potential to burn it. Depends... on microsoft stocks.
Old Jul 24, 2005 | 01:56 AM
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Originally Posted by Wiking
Shorting computer wires has a potential to burn it. Depends... on microsoft stocks.
Yeah well I have a spare one in case I need
What's wrong with MS?
Big boys use FreeBSD. Well on the server anyways.
Old Jul 24, 2005 | 02:26 AM
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Originally Posted by Phatsta
...What's wrong with MS?
Big boys use FreeBSD. Well on the server anyways.
Actually with Gbyte memory I've lost the crashjam-feature. Take care, Fiat has made a pact by MS to develop their Uno's with re liable (=attacking lawyers?) soft ware.
Old Jul 24, 2005 | 02:29 AM
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Originally Posted by Wiking
Actually with Gbyte memory I've lost the crashjam-feature. Take care, Fiat has made a pact by MS to develop their Uno's with re liable (=attacking lawyers?) soft ware.
Yeah I know... exciting isn't it!
OK back to topic...!
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