Ok guys, i have a big trouble and i have a 5 days event next week, kind of a rush here!

i need some help regarding this problem.

i have an error message in the dash, abs trouble and psm trouble.

probably, there is something not connected or wires cut and i need help where to located the problem..


any help appreciated !

thanks a lot

 

What has been done to the car recently? Have you been messing with wiring?

Absent any tinkering with the car, ABS and PSM errors can arise from a bad MAF.

Also an under-performing alternator can cause problems as the battery without the alternator's help can't supply the electrical needs of the car.

 

cage was done on the car.

i had to boost it to start the car back after the cage was done, cage builder forgot the key in ignition

its a braille lightweight battery,

we wrapped the interior harness,

pretty much it regarding electronic...

 

Not sure about the lightweight variety of batteries but lead/acid batteries do not take a full discharge well at all.

Unless you know this does not bother the lightweight battery I'd be inclined to replace it.

If you can, replace it temporarily with a regular battery just to see if getting a *known* good battery in the car makes a difference.

Otherwise you are looking at trouble shooting a MAF or searching for a wiring problem maybe brought about by the cage installation.

 

yes, i will install a regular battery and see how it goes...

do you think we could charge the lw battery and save it?

how could i know if i *hurt* the battery?

 

I'm no battery expert. All I know is there are many stories here and elsewhere of people running a car battery down and the battery just doesn't like that.

Standard references on lead/acid batteries caution against running the battery down.

You might buy some more service life from the LW battery by recharging it, but it will never be the same.

My concern is the battery will cause seemingly random symptoms or it causes an extra load that works the alternator harder and I'd rather replace a battery than an alternator.

Oh, it is up to you what you do. If you want to try a charge that's your call.

 

hi guys,

i still have the problem

i fully charged the battery yesterday

i when on a local track to try the car for the first time and the codes still appears

i know i have a brake bulb that needs to be replace, could that cause the problem?

car is stipped so there is lot of electronic removed...

__________________

 

Replacing the burned out bulb is easy enough it is worth a shot to see if it makes the symptom go away.

ABS and PSM "trouble" can arise from a bad MAF. The MAF supplies data that is used by the DME and other controllers in their calcuations and if this data is too far out the DME or the other controllers can generate errors.

Or since the car has been stripped of wiring the presence of the errors suggests too much wiring was stripped from the car.

About all you can do is double check the wiring that carries the info from the wheel speed sensors is intact and all the connections are good.

Beyond that... I'm at a loss. With all the interdependency that modern car electronics has stripping wiring from the car is perilous.

 

well, so far, i find out that ive removed a little black box in front of the shifter,

this box has something to do with abs and psm... i think i found out my problem

thx everyone for the help, i will report later if its works

 

my first check would be the wheel rotational sensors int eh hubs.

This battery talk sounds like wild guesing

Grant

 

bump guys,

i sent the car to my mechanic and it seems like the problem is my hoosier tire size

im running 17'' wheels ,
- 7' front with 225/40/17
- 8.5' rear with 255/45/17

the pattern isnt good, anyone had this problem before?

i don't really know what do.

get bigger front or rear wheels?
change tire size?
stop using hoosier r6 ?

 

It is possible front/rear tire diameters could account for the behavior/symptoms.

If trying another set of tires/wheels is not an option, all I can advise is you determine the diameters of the tires you have, their differences from front to back, and compare these numbers to those obtained from tire sizes/sets sanctioned by Porsche.

If the numbers of the tires you have fall outside of those sanctioned by Porsche that is a clue, well, a hint at least.

But then you are faced with actually swapping/replacing the tires to confirm that using sanctioned tires and tire sizes make the symptoms go away.

A quick check finds that for 17" wheels front tire size is 7x17 205/50 and the rear tire size is 8.5x17 255/40.

I note the tire sizes you list do not agree with the above but whether that is at the root of what you are experiencing I can't say with certainty.