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OBD Scanners Discussions on using On Board Diagnostic (OBD) scanners/ Diagnostic Equipment related to TDIs

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Old January 3rd, 2009, 10:42   #1
tg2122460
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Default code p0380 2000 jetta TDI

Hi folks, hopefully someone can help, I have a P0380 code Glow Plug / Heater 'A' circuit.

The voltage at all 4 flow plugs jumps only microvolts when the ignition switch / glow plug dash light is lit. Both wires on the harness from the hidden connector to each GP socket harness seems good (ohm meter) and each glow plug measures the same resistance (about 1 ohm).

The circuit seems to be dead so I'm thinking there must be a relay (under tha dash?) that controls this circuit, where is it?

Any other ideas?

Can someone point me to a wiring diagram.

Thanks
Tim.
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Old January 3rd, 2009, 11:16   #2
JASONP
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Depending on if you have 2 or 4 wire harness,it won't tell you which one has a short.
2 wire won't,4 wire will

check this link
http://forums.tdiclub.com/showthread...ight=glowplugs
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Old January 3rd, 2009, 19:22   #3
tg2122460
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An update - it appears the GP circuit may in fact be fine. With the coolent sensor disconnected the glow plug circuit voltage goes to 12.55 volts for approx. 20 seconds at each GP socket. It is a 2 wire harness.

So now I'm wondering why the engine light went on in the first place. I had a shop give me the stored code when it was in for other work, now I need to reset it. I'm in Guelph as well.
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Old January 4th, 2009, 16:31   #4
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Quote:
Originally Posted by tg2122460
So now I'm wondering why the engine light went on in the first place.
Often caused by oxidation of the harness contacts at the glow plugs, in which case simply disconnecting and reconnecting the harness to check glow plug resistance may have already fixed it.

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I had a shop give me the stored code when it was in for other work, now I need to reset it. I'm in Guelph as well.
I suggest posting a request in the Ontario forum, hopefully you can find a member closer than me (Toronto, DVP & 404) with VAG-COM to reset it for you.

Simon
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