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Author Topic: EPC light.. causes?? cures??  (Read 15258 times)
Spinboy
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« on: October 08, 2006, 06:33:29 PM »

Whats up guys..  Ive got an EPC light on an 02 GTi ....the car ran fine up until it was parked for 45 days while I was overseas.  Can anyone help me in finding the cure??? huh  Thanks
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Don®
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« Reply #1 on: October 12, 2006, 08:58:28 AM »

Check your MAF sensor readings it may be failing to give the correct values.

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Spinboy
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« Reply #2 on: October 12, 2006, 04:06:29 PM »

I tossed the car on a Vag today  ( thanks Tim).. This is what it threw back at me:

16490 - Manifold/ Barometric Pressure Sensor (G71) / F96 Implausible signal

16622- Manifold / Boost pressure Sensor (G31) : Signal too High

17956 - Boost Pressure Regulation Valve ( N75): Open Circuit

17705 - Pressure Drop between Turbo and Throttle Valve ( Check DV)

17608 - Boost Pressure Control Valve (N249) : Mechanical Malfunction

16684 - Random /Multiple Cylinder Misfire Detected

16685 _ Cylinder 1 : Misfire Detected

16686 - Cylinder 2 " Misfire Detected

17545 - Fuel Trim: Bank 1 (Add) : System too Rich

17963 - Charge Pressure: Maximum Limit Exceeded

Any help or suggestions would be most appreciated as now im at a total loss as to what to do! afro
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enginerd
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« Reply #3 on: October 12, 2006, 04:53:57 PM »

looks like the battery was dead and had to be jumped it throws all kinds of garbage in there.

Clear codes and run it see what comes back up.
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badger5
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« Reply #4 on: October 12, 2006, 05:22:04 PM »

agree'd.
way too many codes in one hit.

voltage issue... reset and see if any return.
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Spinboy
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« Reply #5 on: October 12, 2006, 08:25:15 PM »

THanks for the info guys.. I had the codes cleared ( using a VAg) and drive around today...this is what pooped back up.

16490 - Manifold/ Barometric Pressure Sensor (G71) / F96 Implausible signal
17705 - Pressure Drop between Turbo and Throttle Valve ( Check DV
17545 - Fuel Trim: Bank 1 (Add) : System too Rich

BUT.. I did disassemlbe my Turbo Xcess DV and found the inner rubber seal to be worn out... so I temporarily ( but maybe permanently) "McGyver'd" it by used the green seal from an old MAF sensor.  The car pulls like crazy now...but I imagine the other 2 remaining codes will show up in a day or 2.... any ideas?? afro
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enginerd
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« Reply #6 on: October 13, 2006, 08:55:30 AM »

Have you ever doen a diode modification to the map sensor wires?
I woudl look there for implausible MAP values.

Also looks like you might have a boost leak somewhere based on the pressure drop code and the too rich code.  Check the hoses around the IC, and the seal around the MAP sensor.

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Don®
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« Reply #7 on: October 13, 2006, 08:58:57 AM »

Oh boy...electrical issues  shocked
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Spinboy
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« Reply #8 on: October 13, 2006, 01:53:52 PM »

The car doesnt have the DIY "diode mod" BUT.. It does have a Split Second Elect. Boost Controller installed , which what Ive learned so far ( please correct me if Im wrong) is basically the diode mod in a $225 box  lol I did check the DV ans found the inner rubber bushing to be a little worn but maybe Ill need to search further...
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