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Boosted_DownUnder

vl link tps question

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Hi guys, I just have a question about my tps on my rb30 vl turbo, I do tps calibration no worries, follow on the screen instructions. I get 0% throttle at rest and 100% at full throttle with 4.86v on the gauge in the link software at rest. But here's my issue. I'm not getting any in between reading only 0% at rest and 100% fully open. I'm not getting 25% or anything while at idle if i raise the idle to 2500rpm is this normal or do i have a faulty sensor? My sensor is wired up to a signal, a 5v and a chassis ground.   

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The manual transmission VL didn't have a TPS standard - it is just an on/off idle switch.  You need to change it to proper TPS as per the manual.  Most users fit the sensor from the auto trans model.

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Ok, so the next step is to confirm that the resistance of that sensor varies with throttle position.  If you set a multimeter to ohms, one probe on center pin and the other on one of the outside pins, the resistance should change smoothly and linearly from closed to open.

 

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It sounds like your TPS is no good.  I dont know the resistance range of this particular sensor but more commonly you would see 500ohms at one end and 5000ohms at the other end.  

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I'll try find my spare tps, my resistance readings were no where near 500 or 5000ohms. So i'm guessing the sensor is bad.  I turned the sensor while the car was running and the idle didn't change. I also put the car under load to check to see if the tps would work under load still nothing. Do you know at all if you have to have both sensors wired up? the throttle switch and analog plug wired up? or if it is okay to run the analog plug on it's own?

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I've ordered a new tps today, should arrive next couple days. Do you think because i'm using the signal wire and the 5v from the tps switch loom this would cause the sensor to only show 0% and 100% like a switched throttle sensor? I'll get the multi meter out again tomorrow. Do you think if i changed the signal wire from the tps switched wiring to the cars factory automatic wiring for the sensor but left the 5v one the tps switched wiring. Would it work or still read 0% to 100% don't want to do damage to the ecu. That was the reason why I followed the link booklet. 

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Follow the instructions.  You cut the 5v and signal wire that originally went to the TP switch "black connector" the connect them to the new white connector.  5v to one of the outside pins and the signal wire to the center pin.  You then need a new wire from the 3rd pin run back to the ground pin on the old airflow meter plug.

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It sounds like the sensor is faulty or the wrong model

ended up being a faulty sensor, got the new one in the mail today. Got the in between 0% to 100% working again. Did a tps cal 100% then 0% at rest the sensor sits at different readings every time I open or shut the throttle. Instead of the reading being smooth upto 100% it glitters and is very inconsistent. At idle on the ecu tps reading can sit at 7.5% then 0.0% then 13.7% then 30.7%? and repeats itself with the throttle completely shut. I can get 100% throttle reading with only 50% throttle depressed on the pedal. Could the issue be the 5v and signal wire may be round the wrong way? I see 4.84v on the an1 - tp (main gauge in the ecu)

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ended up being a faulty sensor, got the new one in the mail today. Got the in between 0% to 100% working again. Did a tps cal 100% then 0% at rest the sensor sits at different readings every time I open or shut the throttle. Instead of the reading being smooth upto 100% it glitters and is very inconsistent. At idle on the ecu tps reading can sit at 7.5% then 0.0% then 13.7% then 30.7%? and repeats itself with the throttle completely shut. I can get 100% throttle reading with only 50% throttle depressed on the pedal. Could the issue be the 5v and signal wire may be round the wrong way? I see 4.84v on the an1 - tp (main gauge in t(grehe e(cu)

(grey auto plug) I've got 5.00v going to the (center pin) blue wire on the plug and on the grey wire (outside pin) i've got 4.84v which i'm seeing on the ecu is this right? then the black with white stripe going to the body of the car (other outside pin)

Edited by Boosted_DownUnder
correct mistake

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(grey auto plug) I've got 5.00v going to the center blue wire on the plug and on the grey wire i've got 4.84v which i'm seeing on the ecu is this right?

 

That doesnt sound like its wired the way I said?:

 5v to one of the outside pins and the signal wire to the center pin.  You then need a new wire from the 3rd pin run back to the ground pin on the old airflow meter plug.

I dont know the wire colours so cant help with those, but it should be easy enough with a mulitmeter to work out which wire is 5V and which is ground.

 

 

Edited by Adamw

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That doesnt sound like its wired the way I said?:

 

I dont know the wire colours so cant help with those, but it should be easy enough with a mulitmeter to work out which wire is 5V and which is ground.

 

 

yea i've got 1 5.00v on the multi meter and 1 4.84v? 

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Can you have a look at what colour wire is connected to pin 18 at the ecu header, if its colour matches one of those wires you have just tested, then this is the one that should go to the center pin on the TPS.

ew5I185.png

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