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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 - 11:07 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 Brake Diagnostics
Kindly provided by Harry Lemmens




This document has been prepared to show how to do simple brake diagnostics on your vehicle. It shows how to run the Brake diagnostics on a Soarer/Lexus SC400. The diagnostics are relatively general, and as such, apply to many different vehicles marketed by Toyota and Lexus.

The same fault codes are often shared by the 2.5 litre twin turbo, and the 3 litre normally aspirated SC300. If there is time, it may also include the fault codes from the Japanese manual, although translation of these will be left up to the end user, as I cannot read Japanese. (NB: Although the actual braking system varies from year to year and model to model, the brake codes seem to be consistent, and generally mean much the same between variations.)

Most of the following has been lifted from the "Soarer Bible". (And mostly from the Lexus SC300/SC400 English manual.) Often, a reference will be noticed to another area. This reference describes further diagnosis and/or the repair procedure. It is NOT the intent of this document to go beyond the fault codes and their simple descriptions.

If you need more specific 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 Soarer Bible CD can be purchased from several sources, notably Jeff Harper (http://www.f1kits.com), or from http://www.tifbitz.co.uk for our mates in the United Kingdom.

Part locations (SC400) Please note that Figure 1 is drawn for a left hand drive vehicle with Traction Control!


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Brake system Diagnostic Procedure

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Error Codes 11 - 34

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Error Codes 35 - 62

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Brake Error Code Clearance

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Testing the Wheel Sensors

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Wheel Sensor Error Codes

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Traction Control Diagnostics Looks pretty much the same as the ABS diagnostic procedure, except the TRAC light flashes!

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Traction Control Error Codes

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How to Clear Trac Error Codes

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Un-translated Information


Please Note The above code listings are NOT comprehensive. They are essentially for the US Spec SC400 and SC300. It is often seen that the Soarer will produce error codes NOT listed above. (Although, generally the Japanese "extra" code is found to be an associated fault. I am not at all certain if this is due to a difference in some of the braking systems employed in the Japanese specification vehicles, or if this just extra diagnostic info for the Japanese market.

To that end, I will also include (untranslated) the Japanese Diagnostic codes below.

If you find a code not shown in the English section, I suggest you ask about it on the forum. Often, someone will pop up and translate the relevant section, or a search of the forum will reveal a previous post on the same problem. (Often, the relevant fix is also pointed out in the forum text as well!)

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