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Old February 21st, 2018, 07:09   #1
showfire
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Default I messed up (solved)

Yesterday I made a huge mistake and connected jumper cables up to my 2003 VW Jetta TDI backwards. The car still starts and runs thankfully but now I have two error codes that have shown up.
P0672 cylinder 2 glow plug circuit/open
P0228 throttle/pedal position sensor/switch c circuit high
Any suggestions on where to start with repairing my stupid mistake?
I was going to start with checking the glow plug in cylinder 2.

Last edited by showfire; March 9th, 2018 at 07:34.
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Old February 21st, 2018, 07:18   #2
oilhammer
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Weird that it JUST did that.

The accelerator pedal assembly is one unit, with both sensors inside it. Couple fasteners hold it to the firewall.

Manual and automatic cars use different pedal assemblies, but the two different manufacturers VAG used are interchangeable.
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Old February 21st, 2018, 07:44   #3
showfire
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Thank you, that is good to know. My car is a manual, this definitely helps to know the sensors are the same.
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Old February 21st, 2018, 07:46   #4
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Did they come back after clearing them?
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Old February 21st, 2018, 07:54   #5
showfire
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Yes they did.
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Old February 21st, 2018, 12:27   #6
BobnOH
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Any blown fuse?
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Old February 21st, 2018, 12:33   #7
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Replace the GP Relay and fuse and check the GP's to see if there still good, replace the TPS on the peddle assembly and any relays or fuses. thats cheep and report back if not fixed. Its odd that this happened as all modern cars have a main fuse on the main input of the fuse box, usualy 100-150 amps, that would have blown first but im shocked it did damage, not the worst thing, just a few electrical parts.
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Old February 21st, 2018, 16:49   #8
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Often the radio is the first to go.
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Old February 21st, 2018, 17:51   #9
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Might be helpful: http://forums.tdiclub.com/showthread.php?t=79819
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Old February 21st, 2018, 19:08   #10
showfire
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Thank you for the suggestions, I am working through them. Most of this work will be done on weekends. There weren't any blown fuses, but one in the black box on top of the batter with the largest cable looks iffy so I plan to replace it.

I will keep everyone posted on my progress. I will keep looking at this thread so if you think of anything else I should check or replace let me know.
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Old February 24th, 2018, 18:14   #11
showfire
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My progress so far has been to replace the battery, I found the 150A fuse on the over battery fuse box had blown. I replaced that after hunting for a couple hours for one.

I checked all of the glow plugs, but they seem to have too low of a resistance based on the tutorial from Wingnut. I am measuring everything around 0.1 ohms, did I do something incorrect or are they bad?

The relay is delivering 11.75-12.10 V to the connectors for the glow plugs when the power is turned on for the car.

I cleared the code and started the engine, it ran smooth but a little on the rich side. I could smell diesel that had not been burned. The code did not come back, instead I am getting:

P0684 - glow plug control module to PCM communication circuit range/performance

Any suggestions about this one? I am thinking there may be a bad connection near the relay but I am not sure. Where is the relay located?

I haven't had a chance to deal with the throttle sensor yet, but I will be removing the throttle this evening and probably getting a new part from a salvage yard on Monday. This error is still the same and present.
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Old February 25th, 2018, 09:36   #12
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On my BEW the smart relay is located at the base of the windshield, under the plastic cowl cover on the driver's side. I can see it through the vents. Don't know if your '03 has the same location, but it's worth a quick glance.
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Old February 25th, 2018, 14:56   #13
showfire
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I don’t see anything back there, just cables and the firewall. But, I may be looking in the wrong spot. In front of the plastic there there is a box above the master brake cylinder with 2 relays but they don’t look like the images I found of the glow plug relay. I reseated both for good measure though.
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Old February 25th, 2018, 16:06   #14
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The GP relay on the '03 is under the raintray cowl at the base of the windshield where the ECU, wiper motor and hardware lives. Rectangular black box aprox 2x2x4" or a bit smaller as I recall.
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2004 Cadillac SLS (wife's)
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Old February 25th, 2018, 16:31   #15
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do you have vag com?
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