Polo vivo EPC fault light

nevashen.maistry
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Polo vivo EPC fault light

Post by nevashen.maistry »

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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panic-mechanic
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Re: Polo vivo EPC fault light

Post by panic-mechanic »

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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175SBU
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Re: Polo vivo EPC fault light

Post by 175SBU »

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

Post by Howie-WP »

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

Post by 175SBU »

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


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nevashen.maistry
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Re: Polo vivo EPC fault light

Post by nevashen.maistry »

Thanks Panic, I will try this over the weekend

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Re: Polo vivo EPC fault light

Post by panic-mechanic »

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

Post by Tander »

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

Post by panic-mechanic »

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.
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Re: Polo vivo EPC fault light

Post by nevashen.maistry »

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

Post by panic-mechanic »

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
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Re: Polo vivo EPC fault light

Post by nevashen.maistry »

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

Post by nevashen.maistry »

After cleaning
Image


Throttle body & sensor plug (Before)
Image

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Re: Polo vivo EPC fault light

Post by panic-mechanic »

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
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Re: Polo vivo EPC fault light

Post by Loyd1271 »

Guys my Polo Vivo 1.4 2012, my plugs burn black and EPC light comes on, rough idle. When i drive fast it hesitates and EPC comes on, ive cleaned Throttle body with the cleaner, ive throwed in injector cleaner and service done all filters changed, after a while came right nowagain its doing the same plugs black
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Re: Polo vivo EPC fault light

Post by panic-mechanic »

it is overfuelling for some reason. You have to scan it first to see if there is an isseu with a sensor. Tehn test things like fuel pressure, etc. usually easier to do that on a dyno and see what it fuels like
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Re: Polo vivo EPC fault light

Post by Gustav7777 »

Good day all. My name is Gustav. I drive a 2004 Polo Classic 9n with a 1.4 bby
engine. I am having the same presice issues as the first post. Is there a number i can contact Stephan on to help me please? Thanks a lot.
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Re: Polo vivo EPC fault light

Post by OettingerTDi »

Hi Gustav

Yes, Stephan can be contacted on 061 507 6017
Anton van Graan

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Re: Polo vivo EPC fault light

Post by Gustav7777 »

Thank you for your reply Anton. I am awaiting Stephans reply on Whatsapp.
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Re: Polo vivo EPC fault light

Post by Monwagan »

Also have the same issues from my polo vivo, and mine won't start at all
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Re: Polo vivo EPC fault light

Post by mngini »

Experiencing same issues with my 2011 Polo Vivo, did you manage to have it resolved :sad:
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Re: Polo vivo EPC fault light

Post by DomzajEtta2 »

Hi someone help please im having the same issue with my 9n 1.4i 8v no error code on diagnosis cleaned throttle body clean maf sensor also lambda sensor but still the same..looks like its overfueling...it starts and idles for a few seconds then dies...if i throw fuel directly into the throttle body then its working fine revs up perfectly fine then..so if anyone resolved this issue please share
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Re: Polo vivo EPC fault light

Post by SLOMBERJACK »

Hi my name is JIMO my polo vivo 1.4 2013 model the EPC light come one I've had it checked with the computer and the diagnose show the error code P1504 manifold leak detected I've removed the exhaust manifold the cat is empty never found a problem there doea anyone know where to look please help
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Re: Polo vivo EPC fault light

Post by Lehwaila »

Hi my name is Lee my polo vivo 1.4 2010 model the EPC light come on.I've had it checked with the computer and the diagnose show the error - Fault in climate control system and Accelerator pedal position sensor 2 low input.Does anyone know where to look please help
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Re: Polo vivo EPC fault light

Post by Andee »

Hi, I'm also experiencing the same problem with my 2011 Polo Vivo with an error Accelerator pedal position sensor 2 low input on diagnostic. I'm thinking of replacing Accelerator Pedal to see if it will solve the problem.
I used to be a Pedestrian until Vdub gave me a Lifetime lift ;-)
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