Joel, keeping in mind TCCS firmware varies among Toyota models, model years, and countries the following diagnostic codes (according to Toyota) will not illuminate the MIL under normal conditions ie; T and E1 in the diag block is not jumpered:
1) The "normal" code (duh
)
2) 11 ECU power
3) 24 Air Temp, except in California cars
4) 41 TPS VTA fault, except in California cars
5) 42 Vehicle speed sensor
6) 43 STA (starter) signal fault.
7) 51 TPS IDL contact fault
8) 71 EGR Temp fault, except in so equipped California cars
There are also others but they only apply to cars sold outside the US, Canada, and OZ. I've not included them to avoid confusion. For example none of the O2 sensor codes will light the MIL on cars that were destined for sale outside of those countries.
There are also conditions that must be met for certain codes to be set whether they illuminate the MIL or not ie; time and rpm, two trip detection (the fault must occur twice with an ignition key cycle separating them), ect. Lets just say that little box sitting behind your glove compartment is a lot "smarter" than many realize.
It's a reason to check for codes on occasion, say during an oil change, even if the car seems to be running OK. I have switch in my glove box that lets me do it whenever I want.
