Tps Troubleshooting

[r32woohoo]

Well i just checked my TPS voltage to try and sort out an idling issue

I've read that it should be around 0.4v closed and 4v fully open

I stabbed the 2 wire plug that comes off the tps with a multimeter and it's reading 10.6v closed, while the car is running:blink:

With the car off it was 9.5v closed and 12.5v open

Am i taking the reading from the wrong place?

Anyone know why it's so high?

On an RB20 by the way

[paulr33]

whats the problem your trying to solve? (details)

yeah the sensor is a 5v sensor and goes from 0.00v to 5.00v

at idle it should be around 0.40v and full open it should be around 3.9v

[r32woohoo]

It misses at idle and fluctuates from 700-900rpm

It misses and jerks a bit when shifting quickly on boost too

edit: There were 2 plugs coming off the sensor, one with 2 wires on the side of it and another one with 3 wires coming out from the bottom of it

I only tested the one with 2 wires, im assuming its the right one because the voltage did change when i opened the throttle

Edited April 1, 2008 by r32woohoo

[r32woohoo]

No one knows why?

Wouldn't the car run like a pile of poo if the sensor was atually stuffed?

[paulr33]

if TPS is toast idle should be like 1500rpm and peg there

[4drftn]

iv managed to adjust my tps so it was ideling at a nice level but it still peaks at around 1100-1200 sometimes and other times when i start the car after driving it wont idle properly and will cut out/stall straight away. alot of the time it will fluctuate between 600-900 and cause jerking around 3000 rpm.

im thinking of getting a new tps so i can eliminate a faulty tps and also maybe clean my throttle body too, as i have already cleaned my aac.

other suggestions on the forum is the cold start.

[Adriano]

Im guessing, but i think the 2 wire plug is for auto trans. The three wire plug is for the ecu. The only way that it can be above 5v is if there is a wiring problem, or the voltage reg in the ecu has short circuted, which is very unlikely. Unplug the tps, and check the supply voltage, should be 5v

[QWK32]

the two wire plug if the throttle on off switch. coming out of the bottom of the tps there is a small length of wire into a 3 wire plug, thats the variable signal plug.

[4drftn]

  4drftn said:

iv managed to adjust my tps so it was ideling at a nice level but it still peaks at around 1100-1200 sometimes and other times when i start the car after driving it wont idle properly and will cut out/stall straight away. alot of the time it will fluctuate between 600-900 and cause jerking around 3000 rpm.

im thinking of getting a new tps so i can eliminate a faulty tps and also maybe clean my throttle body too, as i have already cleaned my aac.

other suggestions on the forum is the cold start.

i got some throttle body cleaner and gave it a good clean. started my car and it idled at 1100 and within about 10 sec it bounced to 1500!. i then adjusted my tps so it droped to 1100. took it for a quick drive, to see how it goes with a clean throttle body, and wouldnt idle lower than 2500rpm! after i got going.

mind you it wasnt fluctuating when idleing, probably cause it was idling to high