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Location:
Dubbo
Registered:
April 2003
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Two Computers?
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Wed, 21 January 2004 11:54
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After flickin through some car mags I see that the 1uz's(in Crowns anyway) run 2 computers one for engine and gearbox. Now if the engine was running a aftermarket ECU would it be possible to run the auto with its own computer?
Just curious that's all 
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Two Computers?
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Wed, 21 January 2004 12:01
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Yup, the Crown 1UZ's use 2 separate boxes. The auto trans box however likes the engine box to be present, therefore the easy way to run an aftermarket unit is to do the messy but common 'piggyback' appraoch - wire up the factory stuff fully, then run new wires to the injectors and coils, and connect these to the 'new' ECU. That way, you can set the fuel and timing, and the factory gear looks after everything else, like changing gears, idle speed, etc. Only thing is, and I'm not sure about this, you might need to leave the air flow meter in place as a load source for the trans ECU - this is quite possibly not true though, merely a guess on my part!  (seeing as people are always in such a hurry to ditch air flow meters when they fit an aftermarket ECU...)
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Location:
Dubbo
Registered:
April 2003
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Re: Two Computers?
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Thu, 22 January 2004 11:59
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Lucky my best mate is a auto electrician!!! And done his own aftermarket ECU...so it's ALMOST time for trial and error!!!
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Location:
sydney
Registered:
March 2003
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Re: Two Computers?
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Thu, 22 January 2004 12:05
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the auto gbox on a crown needs the factory ecu to work like a normal auto
there is a guy in canberra that makes a module that makes the auto full tiptronic
meanin a button to go up gears and a button to go down
this will not change gears automatically
only other way maybe be using the lastest motec to change gears for the auto
but i will prob run into alot of problems
it will be stuck in one gear i presume
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Location:
Dubbo
Registered:
April 2003
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Re: Two Computers?
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Thu, 22 January 2004 12:19
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Can I get contact details of the mate in canberra? This would probably be the best for me. Hows that for luck I just bought a steering wheel with 2 horn buttons
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Location:
Melbourne
Registered:
May 2002
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Re: Two Computers?
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Thu, 22 January 2004 12:24
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you can try feeding the stock TPS signal into the L1 L2 L3 pins of the auto ecu that may keep it happy
Allan
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Location:
sydney
Registered:
March 2003
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