This page details the Toyota 2JZ-GTE engines sequential turbo system.
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I feel that the operation of the 2JZGTE Sequential Turbo system isn't fully understood by many, and when the system malfunctions many people have issues diagnosing the problem.
I've put together this information to hopefully help people to find and fix issues with their sequential turbo system.
This guide details how to test the VSVs and the Actuators for the Sequential turbo system, a failure of which is usually the cause for low boost / sequential system malfunction.
I won't go into how the sequential system works, there are other places that explain that.
e.g. http://www.max-boost.co.uk/max-boost/supra/turbo.htm
This information is based off TSRM (Toyota Service & Repair Manual) http://www.turbosupras.com/pages/en/pages/technical/a80tsrm.htm and http://www.mkiv.com/manual/index.html for JZA80 for the most part.
The below figure identifies the items to be tested, and shows locations.
Note this can also be tested in a different fashion by achieving boost, and then pulling a boost line that goes to a VSV off, e.g. IACV. If the pressure tank is working a release of pressure when you remove the line should result.
It is possible to test say the Intake Air Control Valve (IACV) without removing the VSV for the IACV. Below describes how. This same test method can be used for the Exhaust Gas Control Valve.
E.g.
If the sequential turbo system still doesn't work after checking the above items then there are a number of things that might be wrong still
http://www.max-boost.co.uk/max-boost/supra/turbo.htm
http://www.turbosupras.com/pages/en/pages/technical/a80tsrm.htm
http://www.mkiv.com/manual/index.html
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