LS - 3rd Gen (2001-2006) Discussion topics related to the flagship Lexus LS430

Please help - looking for engine ecu pin-out for ls430/celsior 2002 89661-50590

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Old 11-24-17, 06:51 PM
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jgrov2
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Default Please help - looking for engine ecu pin-out for ls430/celsior 2002 89661-50590

Hello guys, long time lurker, first time poster.

First and foremost Im trying to find the wiring diagram for 2002 LS430 engine control unit namely need to find which wire is the check engine light, rev signal, oil light, charge light and water temp signal.
Secondary to my needs, I need a diagram of how the cooling fans connect to the fan controller ecu. And finally, Id like a diagram or at least know which wires controller the settings for snow, sport modes etc.

Background
Im currently grafting a 2002 Japanese Toyota Celsior with 3UZ-FE into a 1996 Toyota Hilux (pickup). Im currently 90% complete and trying to finalize the wiring between the ecm and the current dash cluster/combination meter. So far Ive been using a combination of an old vvti 1uz-fe diagram and 3uz tundra diagram but both arent helping in this regard. If theres heaps of interest Ill post more info and my thread from different forums. Heres a video of the first start up,

Last edited by jgrov2; 11-24-17 at 07:01 PM. Reason: forgot info
Old 11-24-17, 07:23 PM
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rkw77080
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Attached is the US Model 2001-2003 LS430 Overall Electrical Wiring Diagram. Hope it contains what you need.
Attached Files
Old 11-24-17, 07:28 PM
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rkw77080
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Please also take a look at Post #18 in the link below for the engine control electrical schematic...
https://www.clublexus.com/forums/ls-...-3k-rpm-2.html
Old 11-24-17, 08:23 PM
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jgrov2
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Many thanks lads for the prompt replies, Im pouring through the pdfs and Ill let you know if I get a result.
Old 11-24-17, 09:31 PM
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jgrov2
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So its my understanding that most of the combination meter signals comes through the multiplex ecu thingy? As far as I can see only separate signals Ill be able to get without something reading the multiplex is the rev signal and malfunction lamp? This is not so bad as the stock gauges on the pick up are rubbish and Ill be using aftermarket gauges for water temp, oil temp and pressure eventually anyway was just hoping to use stock gauges for now. Im thinking I might be able to just run a wire from the combination meter (gauge cluster) directly to the oil level switch and splice it in as the switch just grounds the line when its low and the light on the dash already has power.

On a side note, I have two plugs on the air conditioner compressor. One has three wires and is connected to ecu and a/c switch, does anyone know what the plug with the two wires is for? Im assuming some sort of pressure sensor or thermo-resistor. Sorry cant take a photo of it at the moment.
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