Question about 2003 Volkswagen Jetta TDI

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There doesn't seem to be power to the glow plugs when there should be

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  • Greg Gallinger Dec 02, 2009

    No check engine light runs fine once running and warm but very hard to start when cold and no power to glow plug. light in dash comes on for 2-3seconds and goes off. no power when light is on. I tried to disconnect the temp sensors (3 of them) as seen on another site and still same thing?

  • Greg Gallinger Dec 02, 2009

    One plug is .7 the others are all .8 ohms so I'm pretty sure the plugs are alright! where is the relay for the glow plugs? is it one of the ones attached to the firewall inside a plastic container?

  • Greg Gallinger Dec 02, 2009

    I think the fuses are ok but only checked the ones inside drivers side. are there any others for the glow plugs?
    thanks for the help

  • Greg Gallinger Dec 03, 2009

    The glow plugs have power only after the car is running! WTF? no power while the glow plug light in dash is on... not untill the engine is running and then they stay on the whole time??? What could cause this?



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How did you determine there is no power getting to them? If the glow plug light comes on and then turns off immediately, that is the glow plug controller telling you the glows are burnt out.

Test the glow plugs by using a multimeter with an ohm tester. Take the engine cover off and pop the glow plug wires off the glow plugs. They should pop off like a spark plug wire. Find a suitable ground and place the positive lead on the glow plug. It should read approx 1.0 ohm resistance give or take 0.5 ohm. If you find that you have one or more plugs with either high resistance, no resistance, or a large variation between the 4 plugs, then you have likely diagnosed the problem and the plugs need to be replaced. If they are all the same or within .1 or .2 ohms, then the plugs are not the problem.

Beyond that, make sure you have done the obvious and check the fuses. The relay may need to be replaced as well. Good luck.

Posted on Dec 02, 2009

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If that were the case the check engine light would be on if it started and still there should be code stored to help diagnose.

Posted on Dec 02, 2009


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