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Peter Nitschke
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GT4.0 V8

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Reg: 11-2004

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Friday, December 31, 2004 - 08:24 pm, by:  Peter Nitschke Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Toyota Soarer / SC400 EMV Diagnostics
Kindly provided by Harry Lemmens


This document has been prepared to show how to do simple diagnostics on your vehicle. It shows how to run several different diagnostics on a Soarer/Lexus SC400. NB: Specifically for V8 Soarers fitted with an EMV. (Often rebadged as Lexus SC400 in the UK and Australia).

If you need more information, you could ask on the relevant club forum, you could get yourself a copy of the relevant CD’s containing the information you need, or you might purchase the appropriate workshop manuals from your local Toyota or Lexus dealership. (Genuine manuals are easier to use!) The CD can be purchased from several sources, notably Jeff Harper (
http://www.f1kits.com), or from http://www.tifbitz.co.uk for our pommy mates in the United Kingdom.

There are a lot of diagnostic codes available for the EMV subsystem itself, however, I will not describe them here, as they are for the EMV, GPS system, Telephone ECU, Television receiver and Audio system. (And perhaps more …) Knowing the fault codes for these are generally useless, as (mostly) these systems are either not repairable, not used in the vehicles new country, or seem rather obscure. However, the codes are available, and do show up on the EMV screen while using it to do diagnostics. If you really need to know what a particular code is, and it is not already listed, feel free to ask the question on one of the Aussie or UK forums.


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The following describes TWO different methods for getting into diagnostics modes for vehicles equipped with EMV screens.

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Note Procedure 2 above. You can enter diagnostics from an EMV equipped vehicle without applying a wire jumper into either of the diagnostic ports. This seems to suffer from a flaw though, in that the diagnostic mode is cancelled as soon as the engine is started. (Perhaps I did something wrong?)
I am not quite sure whether ALL diagnostics can be performed via the EMV. I suspect that several subsystems have been overlooked. Especially for the suspension subsystem in both the UZZ31 and the UZZ32. Other systems that can be placed into diagnostic mode but seem not to appear on the EMV screen include the Air Bag and the cruise control. So it seems that to diagnose some systems on EMV equipped vehicles, the less sophisticated "count the lamp flashes" technique still needs to be used.
One last note. EFI codes are also displayed in the dash on vehicles that are equipped with a "Scroll" button on the Trip Meter / Clock. Pressing scroll will advance through the list of stored error codes. However, it appears that many (all?) TT’s do not feature this button.

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