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It is traction control, but there's different variations of TRAC. The type mentioned in post 2 above is with regard to a 1994 Supra MkIV and that version of TRAC incorporates the rear brakes into the system, therefore there is the need to occasionally replace and bleed the TRAC system.

If the connections are made as posted above, the TRAC pump will run backwards, i.e., it will try to empty the system into the reservoir. This is obviously incorrect. The top connection (pin 1) of the three connections should be connected to NEGATIVE, and the bottom connection (pin 3) should be...