06-27-2015, 09:13 PM
yes, actually we move it both ways to find the point that it just closes the switch.
if you over travel it, in to closed position, the switch will delay opening,. driving.. and cause ecu to go tad nuts, at throttle tip in,,, hesitate....
that is correct, it's really carbon. and can not reach zero like a normal real gold switch can do easy.
we think the spec. is 300 ohms to you, but 500 to the ECU. (but is speculation that)
for sure get the value below 500 ohms by hand closed with the feeler gauge. the 89/90 is a real pain to do , because after done idle duty cycle will be wrong. then you set idle and then the switch is now set wrong, yes, true pain there and cured in 1991 for ever..
i have the real FSM pages annotated here.
http://www.fixkick.com/All-Pdfs/M89/TPS/...ation.html
it says zero continuity, in the fsm, this is clearly wrong, it should say, (low ohms) and low is defined as below 500, 300 is better IMO.
I try to get it below 300, just a tad. but 500 is ok too. and is spec....
it will never get zero ever. due to carbon based switch contacts.
the ECU uses voltage to detect this trip point, and is a vary low voltage. (a secret) my guess 0.5v?
when the ECU sees the low voltage it, goes to idle mode. instantly.
and ISC wakes up. and regs. (and EGR is cancelled, etc)
also the old engine ,the TPS is set with no using 3 feeler gauges. this invites errors. (human)
some TPS go like this
50 ohms, rising as you turn pot. to 1000 ohms then go to infinity, in and instant. (try it see how yours varies then hits the open cliff of infinity)
that being true, the 500 is about center of this range.
if you over travel it, in to closed position, the switch will delay opening,. driving.. and cause ecu to go tad nuts, at throttle tip in,,, hesitate....
that is correct, it's really carbon. and can not reach zero like a normal real gold switch can do easy.
we think the spec. is 300 ohms to you, but 500 to the ECU. (but is speculation that)
for sure get the value below 500 ohms by hand closed with the feeler gauge. the 89/90 is a real pain to do , because after done idle duty cycle will be wrong. then you set idle and then the switch is now set wrong, yes, true pain there and cured in 1991 for ever..
i have the real FSM pages annotated here.
http://www.fixkick.com/All-Pdfs/M89/TPS/...ation.html
it says zero continuity, in the fsm, this is clearly wrong, it should say, (low ohms) and low is defined as below 500, 300 is better IMO.
I try to get it below 300, just a tad. but 500 is ok too. and is spec....
it will never get zero ever. due to carbon based switch contacts.
the ECU uses voltage to detect this trip point, and is a vary low voltage. (a secret) my guess 0.5v?
when the ECU sees the low voltage it, goes to idle mode. instantly.
and ISC wakes up. and regs. (and EGR is cancelled, etc)
also the old engine ,the TPS is set with no using 3 feeler gauges. this invites errors. (human)
some TPS go like this
50 ohms, rising as you turn pot. to 1000 ohms then go to infinity, in and instant. (try it see how yours varies then hits the open cliff of infinity)
that being true, the 500 is about center of this range.
http://www.fixkick.com