2018 Yaris SE 5MT - T-Sport w/Valvematic! - Toyota Yaris Forums

atomic_hoji · 06-16-2018, 03:04 PM

Quick update - wiring changes made no difference, but hooking the computer up while driving brought to light a couple things. Monitoring STFT and LTFT while driving shows how the STFT is changing under load. With little load it pulls the fuel trim way back, but give it throttle it moves toward neutral (0%). I had the epiphany that the iM demands fuel pump by duty cycle, but the way I've got it setup it is ignoring the duty cycle request and always giving 100%; the ECM asks for x% and the system is ramming 100% to the injectors all the time. Made sense to me anyway..
-- Adam

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06-16-2018, 03:04 PM	#11
atomic_hoji Drives: 2018 Yaris SE 5MT Join Date: Aug 2017 Location: Kincardine, ON, Canada Posts: 273	Quick update - wiring changes made no difference, but hooking the computer up while driving brought to light a couple things. Monitoring STFT and LTFT while driving shows how the STFT is changing under load. With little load it pulls the fuel trim way back, but give it throttle it moves toward neutral (0%). I had the epiphany that the iM demands fuel pump by duty cycle, but the way I've got it setup it is ignoring the duty cycle request and always giving 100%; the ECM asks for x% and the system is ramming 100% to the injectors all the time. Made sense to me anyway.. -- Adam