TPS adjustments, unclear on voltage readings.

Nathaninwa · 06-19-2011, 07:12 AM

Thanks for the link....I had acutally read that before with all my searching. So today I cycled each of my TPS's quite a few times....must have done something because they all seem to work now.

When all are calibrated properly, Im seeing between .5 and .8 volts on the VTC wire at idle, and close to 3.6 volts at WOT with a smooth curve inbetween.

I also figured that Toyota is using the absence of voltage for its idle circuit. When ohmed out properly with feeler guages, I get near .5 volts at idle, and anything above that is 5 volt reference now. All my tps's read the same, regardless of part number. So I am getting my WOT throttle voltage, and hence why there is no voltage check at idle, only wot.

Ill do some more seaching, but I just need to figure out what the ECU uses the speed signal for. Its generated on the back of the cluster and gos to the cruise and engine ECU's. I have found one reference that it uses it for "some ecu functions"

06-19-2011, 07:12 AM	#7
Nathaninwa Intake Join Date: Jun 2011 Location: Aberdeen, WA Posts: 43	Thanks for the link....I had acutally read that before with all my searching. So today I cycled each of my TPS's quite a few times....must have done something because they all seem to work now. When all are calibrated properly, Im seeing between .5 and .8 volts on the VTC wire at idle, and close to 3.6 volts at WOT with a smooth curve inbetween. I also figured that Toyota is using the absence of voltage for its idle circuit. When ohmed out properly with feeler guages, I get near .5 volts at idle, and anything above that is 5 volt reference now. All my tps's read the same, regardless of part number. So I am getting my WOT throttle voltage, and hence why there is no voltage check at idle, only wot. Ill do some more seaching, but I just need to figure out what the ECU uses the speed signal for. Its generated on the back of the cluster and gos to the cruise and engine ECU's. I have found one reference that it uses it for "some ecu functions"