EPC LIGHT

aydin · Oct 24, 2016

Hi i have big issue with my a3.
i have 2003 1.8t aum engine 8L 3door

about 3 week's a go my epc light came on dash and car lost power no boost at all unless while i am driving turn ignition on off very quick then epc light gone off car back the normal. until barely touch gas pedal epc light back on no boost. when car neutaral rev fine. i have been plug diagnostic machine snap on and vag code are gas pedal sensor. i have been change gas pedal then still same, scan the code again this time throttle body , i replace that too then i rev the car 2 times then car completely stop revving. gas pedal no response no rev at all i dont know what to do any body can help me out. i am working in a garage.

car have front mount intercooler n hard pipe aftermarket, dump valve, and old owner remap as 2.0 fsi car is 1.8t

many thanks

vag-tech · Oct 24, 2016

Please post code and description.
Has wiring been checked?

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aydin · Oct 25, 2016

i have read the code today it showing this code p1631 and p1634.
car has no rev at all. running over 1500 rpm. before idle is under 1000 rpm

<tuffty/> · Oct 25, 2016

http://wiki.ross-tech.com/wiki/index.php/18042/P1634/005684
18042/P1634/005684 - Accelerator Position Sensor 2 (G185): Signal too High
Possible Symptoms

Malfunction Indicator Light (MIL) ON
Reduced Engine Output

Possible Causes

Wiring and/or connections faulty
Sensor (G185) faulty

Possible Solutions

Have a look at the Pedal Position Sensor assembly, not the Throttle Body.
Check all connections between ECU and accelerator pedal - of course the pedal itself could be defective too.

Special Notes

There are 2 sensors in the accelerator pedal, both measure the same except that they are working in opposite directions. This means one counts from 0 to 100, while the other one counts from 100 to 0.

Accelerator Position Sensor faults can be caused by issues with the Oxygen Sensor(s) and it's wiring. Please verify thisBEFORE replacing the ECM or Accelerator Pedal. Accelerator Pedal failure is very rare.

http://wiki.ross-tech.com/wiki/index.php/18039/P1631
18039/P1631 - Accelerator Position Sensor (G79): Signal too High
Possible Symptoms

Malfunction Indicator Light (MIL) ON
Reduced Engine Output

Possible Causes

Wiring and/or connections faulty
Faulty ECM
Faulty Accelerator Pedal

Possible Solutions

Check Measuring Block Readings for Accelerator Pedal
Check Voltage Signals from ECM to Throttle Pedal (see factory repair manual)
Check Wiring and Connectors from ECM to Accelerator Pedal

Special Notes

There are 2 sensors in the accelerator pedal, both measure the same except that they are working in opposite directions. This means one counts from 0 to 100, while the other one counts from 100 to 0.

Accelerator Position Sensor faults can be caused by issues with the Oxygen Sensor(s) and it's wiring. Please verify thisBEFORE replacing the ECM or Accelerator Pedal. Accelerator Pedal failure is very rare.

aydin said:
old owner remap as 2.0 fsi car is 1.8t

Not even sure what this means...

<tuffty/>

Jeriho · Oct 27, 2016

I think he is saying that the car has a map for 2.0 fsi tuffty. Is that actualy posible?

<tuffty/> · Oct 27, 2016

Jeriho said:
I think he is saying that the car has a map for 2.0 fsi tuffty. Is that actualy posible?

I very much doubt it... fsi uses a different ECU I believe

<tuffty/>

Jeriho · Oct 27, 2016

Yes i would imagine. Probably some other sensors as well. Yeah than i dont know what it means either

.

aydin · Oct 27, 2016

sorry guys i was busy with car i bought new acceleration pedal car still same no rev still givin code p1631 p1634.. total i have 3 acceleration pedal and 3 throttle body i dont think all faulty.
sometime ondash show traction control warning light...
all the wiring has been check fuse relay all check
ecu plug cleaned.

thanks jeriho car is 1.8t aum engine.. when i connect diagnostic machine and choose 1.8t aum engine machine said no communication ok
if i choose 2.0 fsi axw engine diagnostic machine read fine i can get codes.
before i buy this car old owner said to me car been remap.
i think when they remap this car they put 2.0 fsi sofware or folder.

now i take ecu out. do u think all this cause of ecu.. if you think is possible i will send ecu to a test centre for check it out. or do u know any one do this ecu check i can send it there. thanks for your help.

Jeriho · Oct 27, 2016

If you take the ecu out than tell us the numbers on it. Or better yet make a picture of it and show us.

aydin · Oct 27, 2016

is this ok

aydin · Oct 27, 2016

worse thing i got many parts for car i dont want to scrap it. intercooler, hks turbo timer, adjustable turbo actuator , front and rear brake disc drilled and grooved , speakers , 3 x gauge oil, water , boost, stainless steel cold air intake and filter, coilovers some been fitted some not.

look like one more a3 8l down.

ayfreetee · Nov 2, 2016

Has the throttle body been re-aligned after being removed?

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EPC LIGHT

aydin

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aydin

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<tuffty/>

Badger 5 Edition...Its all about the flow...

Jeriho

Insane and i love it

<tuffty/>

Badger 5 Edition...Its all about the flow...

Jeriho

Insane and i love it

aydin

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Jeriho

Insane and i love it

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