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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old April 14th, 2018, 22:03   #1
classy_gene
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Default Glow plugs 3&4 not working

I have a 02 Jetta that I recently bought. Glow plugs 3&4 were not working so I replaced the glow plugs and the wiring harness. I have cleared the codes and it doesn't start well in the cold and codes for the glow plugs 3&4 continues to come up. Is there something wrong with the control module? The glow plug light seems to stay on the proper amount of time, I have had another TDI so I know how they should start. Thanks
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Old April 15th, 2018, 01:04   #2
burn_your_money
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Did you replace all the glow plugs or just 3&4? If you only replaced 3&4 you probably replaced the wrong ones because the computer numbers them backwards

http://forums.tdiclub.com/showthread.php?t=278188
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Old April 15th, 2018, 10:14   #3
Vince Waldon
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^^ this.... the number one gotcha of glow plug repair.
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Old April 15th, 2018, 18:17   #4
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I replaced all 4
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Old April 15th, 2018, 18:25   #5
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Darn it... t'was a great theory.

Have you found the "Glow plug 101 V2.0" thread? Tons of troubleshooting info there.
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Old April 15th, 2018, 18:31   #6
classy_gene
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Does the control module go bad and only send power to a couple of glow plugs?? I know the harness has multiple wires which I assume are for the individual glow plugs. So I guess I need to test to see if there is power going through all of the wires.
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Old April 15th, 2018, 20:02   #7
Vince Waldon
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There are two wire glow plug systems (power is shared between pairs of plugs) and four wire systems (each plug gets its own power)... don't remember when the switch-over year for Beetles was, although if you got a 3/4 error code you likely have the two wire system.

Either way, it's worth tracking down the master thread: it has all the details, good pictures of the individual components, etc.

Any part of the system can fail, so you pretty much have to take a step-by-step approach to troubleshooting, as replacing parts can be expensive.
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Old April 16th, 2018, 11:02   #8
Rob Mayercik
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2002 has the 4-wire system, so each plug is reported separately.

Don't forget the glow plug "relay" under the cowl.

I say "relay" with quotes because it's actually got a little circuit board in it instead of the usual mechanical relay bits...
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Old April 16th, 2018, 13:18   #9
oilhammer
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I would go after the glow control unit (relay) in the cowl... check the wiring and connector first, for rodent or water damage.

If you do not find anything, put a new one in and see if that fixes your problem.
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Old April 16th, 2018, 20:17   #10
classy_gene
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Update on my glow plug problem. The glow plugs I installed came with my car, they were some off brand that I never heard of. The reality is OHM's don't lie, two of them were junk (open). I replace those two with two used ones I had from my other TDI. The car started good. I have some on order. Thanks
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Old April 17th, 2018, 14:40   #11
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I tried the Autolite ones for a while, had 3 cooked to death in a year (including one after replacing the glow "relay"). Ended up pulling them and putting a full set of Bosch in.

Stick with either Bosch or Beru for an ALH.
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