AFAIK, the BCC won't work on a MKIII.... It'll work on the MKIV, MR2, Celica turbo because the ECU in these cars use the boost signal to supply the ECU with information. The MKIII's boost sensor is only there for the purpose of driving the boost gauge. Do you have a BCC or an FCD?
Nevermind I see it intercepts the TPS' VTA signal. Nonetheless I don't believe the BCC will serve any appreciable function on the MKIII.
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