Polo vivo EPC fault light

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Polo vivo EPC fault light

Postby nevashen.maistry » Sat Dec 10, 2016 12:22 pm

Hi guys,

I have a 2010 Polo vivo 1.4 63kw, I have started experiencing an issue when the vehicle has come to a stop with engine idling (usually at a traffic light or stop street) the EPC fault light comes on. The engine idle becomes rough & increases to about 1200rpm, there is also no response to the accelerator pedal at this time. I have to switch the car off & restart to pull off from the stop. There is no sign of the problem after this action.

The problem is sporadic & doesn't occur at every stop of the vehicle. Prior to this problem I noticed unusual engine response to the accelerator pedal on low revs(in neutral while idling,stationery position) , slow response to react to the pedal & slow return to idle rev mark, sounds like the accelerator is being let of progressively when in fact it has been released completely.

Hoping someone can help me identify the problem

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Re: Polo vivo EPC fault light

Postby panic-mechanic » Mon Dec 12, 2016 8:01 am

Issue with the throttle body.
Either the plug has abad connection or it is dying.
First get some contact cleaner and spray the plug. Make sure not teh break the lock tab when you pull it off.
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Re: Polo vivo EPC fault light

Postby 175SBU » Mon Dec 12, 2016 12:14 pm

panic-mechanic wrote: Make sure not teh break the lock tab when you pull it off.


Panic, do you mean " not to break the lock tab"

Does this mean the plug is not connected properly in that it has intermittent connection?

or

It is corroded with foreign particles

Is it worth cleaning the TB as well?

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Re: Polo vivo EPC fault light

Postby Howie-WP » Mon Dec 12, 2016 3:20 pm

The plugs have an interference fit lock tab that prevents it from detaching, so you have to unclip the interference bit to remove. If this makes sense.

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Re: Polo vivo EPC fault light

Postby 175SBU » Mon Dec 12, 2016 5:32 pm

Sweet Howie, it makes sense, thanks, its just that i have never opened one of them Vivo bonnet.


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Re: Polo vivo EPC fault light

Postby nevashen.maistry » Tue Dec 13, 2016 4:40 am

Thanks Panic, I will try this over the weekend

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Re: Polo vivo EPC fault light

Postby panic-mechanic » Tue Dec 13, 2016 6:58 am

Yes do not break off the securing clip. It is one of my pet hates as seemingly nobody can undo one of those plugs without breaking the clip off. Once that has happened the plug is never secure again.
The trick it to firts push the plug in, then push on the tab and then pull.
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Re: Polo vivo EPC fault light

Postby Tander » Tue Dec 13, 2016 7:10 am

panic-mechanic wrote:Yes do not break off the securing clip. It is one of my pet hates as seemingly nobody can undo one of those plugs without breaking the clip off. Once that has happened the plug is never secure again.
The trick it to firts push the plug in, then push on the tab and then pull.


This is good info. Didn't know this was the way to get them off, thanks!

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Re: Polo vivo EPC fault light

Postby panic-mechanic » Tue Dec 13, 2016 7:21 am

I actually use a different way by using a pick with a 90 degree bend it it and lifting the little locking tab inside fron the open side of the plug. That way guaranteed no breakage but the push first squeeze tab then pull method works fine if you don't have picks.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
'07 Audi A4 2l TDI
'95 Audi 90 coupe quattro
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
'90 mk2 jetta 2l 16v

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Re: Polo vivo EPC fault light

Postby nevashen.maistry » Tue Dec 13, 2016 8:34 pm

Thank so much for the detail guys

Sorry for the stupid question but do you have a photo of where this plug is or description where to find it.

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Re: Polo vivo EPC fault light

Postby panic-mechanic » Tue Dec 13, 2016 8:50 pm

it is the item on the end of the intake manifold where it meets up with the pipe form the aircleaner. That is where the trhrottel butterlfy sits. Plug is on there.

http://www.agthompsonfamily.com/vw/ThrottleBody24.jpg
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
'07 Audi A4 2l TDI
'95 Audi 90 coupe quattro
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
'90 mk2 jetta 2l 16v

Perfect Power dealer. I do dyno tuning.

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Re: Polo vivo EPC fault light

Postby nevashen.maistry » Thu Dec 29, 2016 9:05 am

Hi,

Got a chance to work on the car yesterday, found a bit of grease in the throttle body around the butterfly which I cleaned up. No visible dust or contaminants on the sensor plug, I cleaned out thoroughly with contact cleaner.

After reassembly there was a noticeable difference, throttle was sharp & responsive, EPC fault did not come up during test drive. Was so pleased with myself & chuffed that this is issue is finally fixed until using the car a little later.

Same exact symptoms & fault has returned. I've attached pictures of the throttle & plug a removed to confirm what I've done is correct.

Please advise further what I can do?

Image

Image

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Re: Polo vivo EPC fault light

Postby nevashen.maistry » Thu Dec 29, 2016 9:08 am

After cleaning
Image


Throttle body & sensor plug (Before)
Image

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Re: Polo vivo EPC fault light

Postby panic-mechanic » Tue Jan 03, 2017 9:22 am

Yes correct. Also have a look at the pins side of the electrical plug. And really try to get electrical contact cleaner, spray both sides and see how it goes.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
'07 Audi A4 2l TDI
'95 Audi 90 coupe quattro
'13 VW CC 2l tdi (repair project)
'05 Touareg v10
'90 mk2 jetta 2l 16v

Perfect Power dealer. I do dyno tuning.

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