tps on qtb?

[CozmoNz]

Ok, finally got of my arse, time to do some more maintaince on the trueno >.> how do you recalibrate the throttle pos sensor on a 20v? blacktop (if its different to silver), since my car has started doing the *jerk on accel liftoff* thing, and just checking these forums, seems tps is the culprit.

but how do you reset / calibrate it? or should i just take it down to the toyota dealiship?

[Durrty]

Ok, finally got of my arse, time to do some more maintaince on the trueno >.> how do you recalibrate the throttle pos sensor on a 20v? blacktop (if its different to silver), since my car has started doing the *jerk on accel liftoff* thing, and just checking these forums, seems tps is the culprit.

but how do you reset / calibrate it? or should i just take it down to the toyota dealiship?

yea i would be keen to know, that happens om my starlet

[CozmoNz]

So?

anyone know how you recalibrate the throttle pos sensor on a blacktop?

[TrouserFxGt]

here it is. Straight from the blacktop engine manual. This should cure the on/off throttle jerkyness with everything else being correct.

Get dmm (aligator clips recommended), long slim feeler gauges or lengths of wire of 0.8mm (0.031"or 0.032") and 1.0mm (0.040") diameter and a stubby or right angle phillips screwdriver.

remove plug from tps

note the position of the four pins. Looking down at the tps and with the square dodad on the left the pins are from top to bottom VC, VTA, IDL, E2.

the throttle stop screw and lever is located between 2 and 3 throttle bodies behind the throttle cable bellcrank on a 20v. Should be easy to see on a blue/red top.

with the throttle closed the resistance between VTA and E2 should be 0.3-6.3kohm.

with a 0.8mm (0.031") guage between the throttle stop screw and lever the resistance between IDL and E2 should be 0.5kohm or less, maybe as low as 1ohm. This measurement is critical to eliminate the on-off jerk.

with a 1mm (0.040") guage resistance between IDL and E2 should be infinity (open circuit?)

with the throttle fully open resistance between VTA and E2 should be 1.8-11.5kohm

fully open resistance between VC and E2 should be 3.5-6.5kohm

to adjust the tps loosen the two screws and rotate it to get the required reading. The 0.8mm is the most critical measurement and as long as that and the 1mm measurement are right the rest should be within range aswell. It wont need much movement at all and will be fiddly to get right.

hope this helps.

all so the same precedure for the the other map 4age engines I believe

[CozmoNz]

here it is. Straight from the blacktop engine manual.

Get dmm (aligator clips recommended) and feeler gauges.

remove plug from tps

note the position of the four pins. Looking at the tps and with the square dodad on the left the pins are from top to bottom VC, VTA, IDL, E2.

with the throttle closed the resistance between VTA and E2 should be 0.3-6.3kohm.

with a 0.8mm (0.031") guage between the throttle stop screw and lever the resistance between IDL and E2 should be 0.5kohm or less.

with a 1mm (0.040") guage resistance between IDL and E2 should be infinity (open circuit?

with the throttle fully open resistance between VTA and E2 should be 1.8-11.5kohm

fully open resistance between VC and E2 should be 3.5-6.5kohm

to adjust the tps first I sugest you mark the tps body and manifold so if you cant get it right you can return to the way it was. Then loosen the two screws and rotate it to get the required reading. It wont need much movement at all and will be fiddly to get right.

hope this helps.

all so the same precedure for the the other map 4 age engines I believe

*hugs* I LOVE YOU ^_^

[TrouserFxGt]

calm down cozmo

did it help?

[Muzzie]

here it is. Straight from the blacktop engine manual.

Get dmm (aligator clips recommended) and feeler gauges.

remove plug from tps

note the position of the four pins. Looking at the tps and with the square dodad on the left the pins are from top to bottom VC, VTA, IDL, E2.

with the throttle closed the resistance between VTA and E2 should be 0.3-6.3kohm.

with a 0.8mm (0.031") guage between the throttle stop screw and lever the resistance between IDL and E2 should be 0.5kohm or less.

with a 1mm (0.040") guage resistance between IDL and E2 should be infinity (open circuit?

with the throttle fully open resistance between VTA and E2 should be 1.8-11.5kohm

fully open resistance between VC and E2 should be 3.5-6.5kohm

to adjust the tps first I sugest you mark the tps body and manifold so if you cant get it right you can return to the way it was. Then loosen the two screws and rotate it to get the required reading. It wont need much movement at all and will be fiddly to get right.

hope this helps.

all so the same precedure for the the other map 4 age engines I believe

*hugs* I LOVE YOU ^_^

Is it just me or is that comment slightly disturbing?

[TrouserFxGt]

edit.......................read again

I just adjusted the tps on my blacktop. It was quite a bit out as it was reading open circuit (infinity) just off the stop. I needed to turn it about 4-5 deg cw. This has cured my on/off throttle jerk and (this might be placebo effect) has slightly improved midrange.

[pervert]

*hugs* I LOVE YOU ^_^

Is it just me or is that comment slightly disturbing?

Yes, yes it is...

[gtz666]

sorry to ressurect the dead everyone
this is for silvertops aswell (resistance) etc

[sergei]

there is much simpler way to just adjust (not check)... with the TPS connected ingnition on and throttle closed the voltage between VTA and E2 should be 0.5V.

[sergei]

probably works only on 20v

[matt dunn]

there is much simpler way to just adjust (not check)... with the TPS connected ingnition on and throttle closed the voltage between VTA and E2 should be 0.5V.

Yes on a system that does not have a TPS closed switch. ( most mitsi's)

But on ones that do ( toyota's ) the voltage and switch often get out of sync slightly, so if you set it at 0.5v, you are basically random guessing if the sw is closed or open.

We get them in work all the time where people that have no idea have a play and they shag up the settings.
just like the people who think that you adjust the throttle stop to change idle speed.

Matt

[sergei]

hmm, interesting, makes me think that I might have it set wrong then...
I will check it on weekend.