Can't remember exactly when the Toyota showed up in game. If it was before the DLC colours, you should check the range from (decimal) 3113 (up to 3112 is a lot of Shelby) to 3192..
There's a Mercedes "Gran Turismo blau" at 3161 and a Lamborghini "ARANCIO" at 3168.
If it is not inside this range, go beyound the DLC Colours and check from 3293 up to 3405 (the C7 is folowing after that).. There are some Toyota colours inside the range. Unfortunately not the ones you're looking for