Checking Sensors

[gttiwanna]

hey guys i was just checking my tps for voltages and came up with

r34 gtt 4 door fmic exhuast

black wire ground

white wire .4v

red wire 5.1v

does that sound rite?

and while i was doin this i looked at the boost sensor at the back of the fire wall

and foun the same but the red wire had nothing no voltage at all? how do you test these things? and what are they spose to put out?

[89CAL]

2 plugs on TPS, one is digital, one is analog

So one is on/off and the other is basically a variable resistor. What you will get depends on where the sensor is. I'm not sure which is which on the newer style TPS but with a multimeter checking reistance on the digital sensor (again not sure which plug it is) you should get an open circuit and then when you move the TPS it should at some point close and you will get a circuit.

The other plug should vary as you turn the TPS. The varying resistance changes the output voltage when it is operating in car.

To test it properly it will need to be plugged in and car on. Then back-probe the plug to get the voltage at idle. If the sensor isnt plugged in you wont get the right result. I'm not sure how you tested the TPS in your first post so you may have already done this

Boost sensor might be harder to test.

Can I ask why you are testing the TPS and the Boost sensor?

[gttiwanna]

yer had the car turned to on and the volts moved from .4 to 4.4 when i moved the throttle and yer sensor plugged in.

ive been having issues with my boost for ages now and whilst again looking under my hood trying to find the prob i thought i might check some sensors lol

and boost issues are over boosting to near 1 bar everytime with controller without controller with standard soliniod and without, boost leak tested looked at the wasgate flap for points of hitting the dump pipe or getting stuck , moved the vac line somwhere else the same 1 bar pretty much everything ive tired i even ported out the wasgate hole a lil bit and tripple checked that wasnt leaking

thats when i got sick of it and started to test sensors for the hell of it

[gttiwanna]

o and the boost sensor coz after i put the fmic in i put a new boost sensor in cause some noob broke mine so i thought i better put it back on and thats when the problems started so thought i better check to see if that works propper but dont know how to test it

it seems a lot of people have the same prob when they fit a fmic and full exhuast but noone gives me a straight answer how they fixed it