Is the 5th injector and ABV Switch connected to the Unichip? There are 3 wires that run to TRD ECU from the SC. The Pink Wire is +12v anytime the engine is on, the Black/Pink is the ABV Switch control and the Black/White is the 5th injector control (I think those are the right colors). There is an ABV Switch mod that is very simple, it maybe posted on this site somewhere, but here's a C9 link.
http://corolla9.com/index.php?/topic/25 ... c-abv-mod/" onclick="window.open(this.href);return false;
The 5th injector is VERY important for running these SCs because the Stock injectors (about 260 cc/min) can't put enough gas into the the engine. So the TRD ECU uses the 5th injector to enrich the gas mixture and has other benfits for the SC. The other option is to use 2zz injectors (about 310 cc/min), which is common for most piggy back ECUs. I'm not saying the Unichip can't work the 5th injector but normally that's a very delicate control.
Until you are sure the 5th injector is hooked up and working you may want to drive it very gently and keep the RPMs below 4000 whenever possible. However installed it should have connected the 5th injector to the Unichip.
Is the car an AT or MT? I do have an MT TRD ECU floating around.