tried searching, please help

[deansibiza]

ok where shall i start?

ive been having problems with my cupra since the day i got it tbh, it just doesnt want to boost, ive changed the maf, n75, and the n112 and also all vac pipes.


at first i was getting the tcs light on the dash which i found was the maf, so i changed it, the light went out but still no boost, so i then changed the n75, n112 and all vac pipes, still no boost (when i say no boost it is actually 5psi.

i then went to a garage as i was getting charge pressure control positive deviation, and they couldnt find any problems, but they did bypass the 112 and n75 and i got boost, but im not happy driving it bodged up tbh so it was back to the drawing board.

so for 3 months now ive had nothing butr crap and then last night the traction control light came on again and i get the following from vag com:
7 Faults Found:
17833 - EVAP Purge Valve (N80): Short to Ground
P1425 - 35-00 - -
17955 - Boost Pressure Regulation Valve (N75): Short to Ground
P1547 - 35-00 - -
17525 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2: Short to Ground
P1117 - 35-00 - -
17843 - Secondary Air Pump Relay (J299): Short to Ground
P1435 - 35-00 - -
17829 - Secondary Air Injection Solenoid Valve (N112): Short to Ground
P1421 - 35-00 - -
17695 - Boost Pressure Control Valve (N249): Open Circuit
P1287 - 35-00 - -
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-00 - -
please help if you can i love my car but im very quickly going off it.


also the car is mapped, it has a chipped uk map on it and should run peak about 18psi (which it does when bodged.)

 

[m0rk]

when did you have it mapped?

but either the wiring is mullered, the MAP sucks chops, the ECU is dieing, or you've got water in everywhere

 

[matsportline]

You checked your cat?

 

[Daz_gibbo]

If you could clear the codes and take it for a drive and check what codes reappaer it would be easier to make out. I assume your MAF code is from before, unless it was cleared -then you have another problematic MAF.
Might be worth finding out if any of those other codes are related electrically.
A wiring diagram would be handy..
Assume your N249 is not plugged in?

 

[deansibiza]

i had it mapped in january, cant see it being water tbh because up untill last night i only had the one code and theres been no water under the bonnet im just soo pi55ed off with it tbh, it seems the harder i try with it the more problems it gives me, only last week i had to replace a coil and my clutch pedal snapped.

 

[deansibiza]

If you could clear the codes and take it for a drive and check what codes reappaer it would be easier to make out. I assume your MAF code is from before, unless it was cleared -then you have another problematic MAF.
Might be worth finding out if any of those other codes are related electrically.
A wiring diagram would be handy..
Assume your N249 is not plugged in?

i cleared it 10 times now mate and as soon as i start it all seven codes apear and the tcs light comes on within 5 sec's

 

[Daz_gibbo]

Checked all your fuses? Im sure a guy on here said a 10A fuse kept blowing from a dodgy lambda

 

[richybigman]

Could it be a bad earth?

 

[Steve GTI]

Isn't TCS Traction control?

 

[deansibiza]

Isn't TCS Traction control?

yes mate, but it also comes on for other problems such as the maf.

 

[deansibiza]

all fuses are fine, and how would i check the earth?

 

[deansibiza]

anyone in kent that could look at it for me?

 

[richybigman]

Make sure the strap from the negative terminal on your battery has a good tight connection at both ends. Try using sandpaper where the earth connects just to make sure the connection is good.

 

[PhilW]

I had this when i melted my N112.

Check your fuses, namely the ones in the top row. 10 or 20amp fuse i think it was.

 

[deansibiza]

thankyou daz and phill, no8 fuse was blown after checking again and now ive changed it im back to the old "positive deviation code"

it seems that i get problems and fix them but all along i have 1 still in the back ground causing the lack of boost.

 

[stevegti6]

this might not help but i had a mark4 golf gti turbo with revo remap loads of other mods and maid 154bhp on the rolling road bill from badger 5 narrowed it down to the turbo was shot it just did not boost and it was a low mileage car just a thought

 

[Daz_gibbo]

Doubt the turbo is shot as Positive deviation is basically saying it's overboosting. Actuator could be up the swanny though.

 

[stevegti6]

Doubt the turbo is shot as Positive deviation is basically saying it's overboosting. Actuator could be up the swanny though.

could be im still finding my cupra a big learning curve

 

[Daz_gibbo]

Might be worth checking the number of threads you have showing on your actuator rod. Should be ~13 threads from the top nut to the end of the rod.
Oh yes, 2 1/2 yrs im still learning, this forum is great though for tech stuff

 

[stevegti6]

Might be worth checking the number of threads you have showing on your actuator rod. Should be ~13 threads from the top nut to the end of the rod.
Oh yes, 2 1/2 yrs im still learning, this forum is great though for tech stuff

i know mine is a lot less than that but jaba sport has been playing with mine
your spot on with this forum mate i learn something new everday