Erratic Tps 34 Gtr

[trick]

Hey ppls,

hope someone can shed some light on the issue.

My 34 GTR with just the ignition on,the TPS gauge flickers from 0% to around 2%, but the power FC does not show ant voltage change (0.41v.

Is this normal???

and could it be why when i put my aircon on the LSD-4WD light come on.

do i need to reset the CPU and or do i need to calibrate my TPS,

by the way its a new TPS.

Thanks any advise would be great

mike

[paulr33]

0.41 sounds Ok to me

when you mash pedal with ignition on but car not running does TPS % change, the voltage on PFC should also follow

if TPS is toast or out of range the PFC will throw on the engine check light and its name will highlight under ETC, SENSOR SW CHECK with a black background

when does 4WD/A-LSD light come on? every time?, erracticaly? somtimes?

what mods done to the car? has it always been broken or only recently?

[trick]

0.41 sounds Ok to me

when you mash pedal with ignition on but car not running does TPS % change, the voltage on PFC should also follow

if TPS is toast or out of range the PFC will throw on the engine check light and its name will highlight under ETC, SENSOR SW CHECK with a black background

when does 4WD/A-LSD light come on? every time?, erracticaly? somtimes?

what mods done to the car? has it always been broken or only recently?

Hi, yeah the Fc voltage follows the mfd signal,

the lights come on sometimes, but mainly when i turn the aircon on, after a few minutes or so.

The guy i bought the car off had the same problem so he replaced the TPS but has not fixed the problem.

The gtr has -5 turbos, 600cc injectors, fc boost controller, high flow fuel pump, few other mods but nothing more engine wise.

The TPS i assume has been stuffed for a while. Ive checked almost everything to do with this issue and think its possibly out of range and once the aircon comes on the the engine changes its base idle it sets it off.

i have not done a reset of the fc yet. i have to save the tune first and re-do the idle learn sequence.

Edited January 8, 2011 by trick

[paulr33]

when the engine check light comes on, you need to check ETC, SENSOR SW CHECK and see which sensor highlights

my advice is leave the hand controller on this SENSOR SW CHECK screen all the time and when the engine light comes on look over and see whats highlighted

if the TPS is toast then it will highlight it

a busted TPS or one that goes out of range will kill A-LSD/4WD as the A-LSD/4WD computer in the boot needs constant stable TPS signal to detect how hard you flog the car

if TPS goes out of range the A-LSD/4WD computer will panic and go into failsafe mode, ie light comes on and it stays in RWD/Non vspec mode

[trick]

when the engine check light comes on, you need to check ETC, SENSOR SW CHECK and see which sensor highlights

my advice is leave the hand controller on this SENSOR SW CHECK screen all the time and when the engine light comes on look over and see whats highlighted

if the TPS is toast then it will highlight it

a busted TPS or one that goes out of range will kill A-LSD/4WD as the A-LSD/4WD computer in the boot needs constant stable TPS signal to detect how hard you flog the car

if TPS goes out of range the A-LSD/4WD computer will panic and go into failsafe mode, ie light comes on and it stays in RWD/Non vspec mode

no worries ill do just that.

thanks heaps for your help

hopefully i can narrow it down

cheers

mike

[NIS.26L]

i had the same problem about 2 years ago tried everything untill i finally gave up put the stock ecu back in and went to nissan to conect there scan tool and it said the tps was droping the voltage down to .41 at ilde, the minimum it should ever be was .45 at idle so i adjusted it buy loseing the 2 bolts that hold the tps and with a volt meter conected i turned the tps untill it read .45 and then tighen the bolts and recheck it jus to make sure as it was tightened it didnt change and never had a prob since.

[trick]

That's good news. Mine does read .41 at idle too.

Hopefully it works for me too.

Cheers

[snozzle]

interesting, ive been having the random rwd mode problem too.. ill also check my minimum tps voltage

thanks for the info

edit: i just checked it out now, it reads 0.28v on idle and 3.98v on full throttle (engine not running)

Edited January 9, 2011 by snozzle

[NIS.26L]

also i forgot to mention make sure u test it by pushing the acclerator down and lift your foot of it fast so it springs back and then check it while u ease it off slowly while reading the volts before u drive it to make sure its right as u cant really check it while u driving

[snozzle]

Ive got a power fc so its really easy to do it, no need for a multi meter etc. I re-adjusted the tps so that it now reads 0.47v with throttle off (it actually flickers back and forth from 0.46 to 0.47..) and 4.22v at full throttle.

I started the car up 5 times since then and the 4wd has worked every time! Thanks a million for the info, George, and also thanks to the topic starter.

[trick]

Ive got a power fc so its really easy to do it, no need for a multi meter etc. I re-adjusted the tps so that it now reads 0.47v with throttle off (it actually flickers back and forth from 0.46 to 0.47..) and 4.22v at full throttle.

I started the car up 5 times since then and the 4wd has worked every time! Thanks a million for the info, George, and also thanks to the topic starter.

yeah have a fc too, adjusted to .45 but only goes to 4.00 full throttle?? should it be more at full throttle??

Thanks to all with the info, saved me time and monies

cheers

mike

[trick]

UPDATE:

played around with the tps, fluid level and still having the lights come on. thought i had it sussed but it still came on after a few days

my question is has anyone done the wire mod where you cut the pin #56 and join it to the pin #38 on a gtr?

i read the forums and seems everyone was having issues with a gtst with alsd.

is there a way to test if the alsd is getting the tps signal

thanks

mike

[paulr33]

do not do that mod, that is for ECR33 only with active-lsd and a powerfc

this is because the powerfc in the ECR33 assumes the car doesn't have a-lsd as only a few models had it

the BNR/BCNR range of powerfc all assume this as far as i know and relay TPS correctly as its needed for the 4WD computer anyway

[trick]

Mmmm fair enough. I think ill buy a new tps and go from there.

Cheers again

[trick]

hey Paul or anyone else, do you have the pin diagram for the actual attesa computer, so i can check the tps signal is getting to the attesa?

thanks

[paulr33]

if it has no TPS signal A-LSD never passes diag when you start the car and it fails every time

so if yours is working and only randomly failing it could be a wheel sensor that is being whacko. does your ABS work OK? any ABS warnings as they use the same sensors

[trick]

if it has no TPS signal A-LSD never passes diag when you start the car and it fails every time

so if yours is working and only randomly failing it could be a wheel sensor that is being whacko. does your ABS work OK? any ABS warnings as they use the same sensors

hey paul,

been playing around again with the tps setting it from 0.47v to 0.55 v just to see whats happening.

since playing around the lights come up about 30 seconds once ive started the car.

the fault codes are 72 (tps), but it also flashes 12? what is 12 code?

mike

[paulr33]

no idea what code 12 is

if TPS isnt working your car would run like ass, peg its idle at 1500rpm instantly and A-LSD would always be on, among the engine check light too

so the TPS is OK

start your CAR when watching ETC, SENSOR SW CHECK and wait TPS when its working OK, and then watch TPS (and others) when A-LSD fails

does anything change or any sensors go black background

do any other errors come on other than A-LSD ?

but perhaps the TPS to the computer in the boot is being homo

only way would be to work out which wire is TPS relayed signal at the boot computer and check it there

very tedious and annoying

[trick]

its very weird, sometimes it comes on straight away sometiimes it doesnt at all.

nothing seems to change on the power fc sensor check page, no extra dots.

once the lights come on it locks out some numbers on that page but nothing else.

i may need to test the attesa at the back and check the signal.

if its the abs wouldnt that come up as a fault code?

[trick]

been testing the voltage at the fc. with just the ignition on the volts to the fc are 0.568, it matches the hand controller voltage. Also the output to the attessa reads the same.

Once ive started the car the voltage at the fc slowly drops to -0.36mv, as if its lost the signal but the hand controller still states it has 0.5v. now im confused. is this a correct reading for tps output or is this why my

fault light is coming on?, but the hand controller says its all good. ahhhhhhhhhhhhhh