AEM FIC Tuning

[Focus_Sh1ft]

Originally Posted by Bluevitz-rs

This is what I was saying about the difference between the Yaris ECU and the Echo ECU. The Echo's is way more forgiving if it doesn't see normal values. The Yaris will freak out and correct them.

I'm just curious as to why you think this? Theoretically, if you're manipulating the AFR sensor's voltage, it can't really correct itself since it's the main method of fueling feedback (and therefore will think that everything is okay).

However, I definitely think the ECU might see continuous low voltage at the AFR sensor and throw a code. More importantly though, it probably would throw the engine into open loop. No one has really tested this method of tuning on the Yaris yet, so I'm just speculating.

Could this be where the Yaris and Echo ECUs differ?