[Vwdiesel] [VW-TDI] Re: 2001 Golf GLOW PLUG CIRCUIT error (was Headlight Issue - cont'd)

[Tad]

Correct about the GP monitoring, at least for 2001 models - they switched to
a 4 wire harness in 02 or 03.
Just to be clear - the CEL code was cleared/reset after the harness was
replaced?  Cuz it won't clear itself...

Technically the GPs do impact emissions, at least during startup and cold
running.

If the GPs all test approximately the same resistance and the harness is
known good w/no corrosion, the next step would be replacing the relay, which
is a little spendy.

*Theoretically* you could electrically tie together the two wires of the GP
harness, rendering the 'test' always successful... however this is just
theory, I've never heard of anyone actually trying it.  Assuming the
inspector doesn't notice/mind your splice job, all should be well.  That is
except in the unlikely case that there is in fact something wrong with your
relay, and making this mod might cause an overload/fire hazard condition.

ABS issue: to answer your question - doubt it.  However I'd bet your issue
is 'crud' in one of the ABS sensors at the hub.  I watched a guy do a
big-brake upgrade at a GTG last summer and you'd be surprised how much crap
builds up back there.  I wouldn't be surprised if the computer stores which
sensor is the issue, which would at least narrow things down.

On Sat, Apr 25, 2009 at 10:45 AM, Rolf Pechukas <rbp at 4u2bu.org> wrote:

> hey gang
>
> so I finally fixed the headlight issue
> turns out the brand-new bulb I bought was bad
> LOOKED fine, but wasn't
> replaced and all good
>
> went to get insp sticker and FAILED
>
> why??
>
> b/c the Check Engine light was on
>
> code? 380 - Glow Plug circuit
>
> failed for 'Emissions' (?!)
>
> even though this error has nothing to do with emissions, apparently
> any computer code error gets lumped under 'emissions'
>
> so this Golf has apparently had this GP circuit issue for a long time
> PO had the wiring harness replaced to no avail
>
> I remember asking about this a while back, and someone said that the
> GP sensor tests for resistance difference between the 2 sides (2 GPs
> per side) of the GP circuit
>
> if it finds a difference, it registers an error
> for some reason, it's finding a difference
>
> no issue w/ GPs - starts fine cold, even thru winter - chick vroom
>
> QUESTION:
> is it possible to 'hotwire' or 'jump' this sensor somehow so it no
> longer 'sees' a difference between the 2 sides?
> b/c I have 60 days to fix this problem (thankfully it's not 7)
>
> also:
> ABS lite comes on intermittently too
> could be just wasn't on during inspectn
> but I could fix GP issue and still fail on re-inspection for ABS error
> any way to jump THAT sensor?
>
> thanks for all your help guys
> I do NOT know my way around these late-model cars
> looking wistfully at the 81 Rabbit sitting in my driveway
>
> BTW, I'd hate that to sit for too long
> anyone want a great Rabbit that needs a head gasket?
> new tires, running like a top before it blew, some rust, but a great
> daily driver
> just don't know when I'm going to get to the head, and would hate for
> it to rot
>
> thanks again,
>
> Rolf in MA
>
>
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