Question about 1998 Volkswagen Jetta

11 Answers

GLOW PLUGS DO NOT WORK on 1998 jetta tdi

I replaced glowplugs. relay,fuses and temperature sensor,but glow plug lite will flash for one second and will work if I disconnect the plug from the temperatue sensor

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  • burgemik Jan 17, 2009

    With respect to your answer which was not satisfactory I switched the temperature sensor from one vehicle to another and it worked on the previous one but will not work on the vehicle in question

  • burgemik Jan 17, 2009

    It would be unsusual for 5 different temperature sensors to be defective.

  • burgemik Jan 17, 2009

    I checked the glow plug harness and I get power at the connectors all 4 with the temperature sensor un plugged

  • burgemik Jan 17, 2009

    I did replace the temperature sensor with new ones I had in stock.I did this after your last answer to replace it, same results, light will stay on for a second only

  • burgemik Jan 17, 2009

    As I had indicated earlier I did replace the 2 fuses one on the fire wall and one on the fuse/ relay panel

  • burgemik Jan 17, 2009

    I think we are talking about two different cars the 99.5 and up had the fuses on top of the battery, this car is a 1998 tdi old style body that is the subjest of discussion

  • burgemik Jan 17, 2009

    Could someoneexplain where the glow plug control module is situated on the 1998 vw jetta tdi also can someone send a diagram of the fuse/relay panel

  • burgemik Jan 17, 2009

    Could someone explain where the glow plug control module is situated on the 1998 vw jetta tdi also can someone send a diagram of the fuse/relay panel

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11 Answers

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  • Master
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If the resistance reading is nominal at the sender, check it under the dash at the glow plug relay socket. This signal is present at the connector labeled "T", read resistance from there to ground. If you get a different value than you read at the sensor, there is a problem in the wiring or the connector itself.

If you need more info, this is a perfect site with all the info you need. Copy and paste in browser;
http://www.4crawler.com/Diesel/CheapTricks/GlowPlugs.shtml#TemperatureSensor

Posted on Jan 17, 2009

  • 1 more comment 
  • Nate Stansfield
    Nate Stansfield Jan 17, 2009

    I was wondering if you got any engine codes with this problem. The dealership can updated your cars computer software also. I've read that some sensor can be to sensitive and they need an update.


  • Nate Stansfield
    Nate Stansfield Jan 24, 2009

    The North American market 1998 A3 has the "180" glow plug relay
    attached above the main relay block. The glow plug fuse is mounted just
    above the glow plug relay, not separately on the inner firewall as on
    the B4. Also note in the image below that there is nothing in the lower
    right relay socket (location #12). This is a difference from the 97 B4
    TDI which needs a jumper to feed power to the glow relay 180.

    Note: The installation of a #12 jumper relay from a 1997 B4, or the
    installation of a "103" or "180" glow plug relay in this vacant
    position with the 1998 A3 wiring harness can also cause damage to
    electrical components and possibly fire from dead shorts.


    In the 98 A3 the socket #12 is empty. The glow plug fuse is before the
    glow plug relay. The fuse is always hot. Again there is no easily
    accessed test point for either.



  • Nate Stansfield
    Nate Stansfield Jan 24, 2009








    Hello – Denise





    I have attached the info on the fuses.





    Also, if you need more info please indicate your engine by
    liter….1.8L, 1.9L, or 2.0. Also is the model a GL, GLS, GLX, GT or
    TDI.





    As for the alarm…I would prefer to have the above info first to make sure I had the correct vehicle to review.




    If I may ask, what is the reason you want to disconnect the alarm
    system?? Is it not working correctly…..something we may be able to
    assist with fixing?





    Thanks for the donation





    Please let us know if what the final fix was for your car so we can better assist others. Thanks!





    Find a car repair manual for your car repair questions.














    Fuse locations for options not shown can be found in the corresponding wiring diagrams.


    Amp.








    1 - Headlight, Low Beam, Left (56b) 10


    2 - Headlight, Low Beam, Right (56b) 10


    3 - License Plate Lights (5 10


    4 - Rear Window Wiper And Washer System 15


    5 - Windshield Wiper/Washer 15


    6 - Fresh Air Blower, A/C (X) 20


    7 - Tail Lights, Right (58R) 10


    8 - Tail Lights, Left (58L) 10


    9 - Rear Window Defogger 20


    10 - Fog Lights 15


    11 - Headlight, High Beam, Left (56a) 10


    12 - Headlight, High Beam, Right (56a) 10


    13 - Horn (15) 10


    14 - Back-Up Lights 10


    15 - Engine Electronics (15) 10


    16 - Power Sunroof, Front Map/Reading Light 15


    17 - Emergency Flashers (15) 10


    18 - Fuel Pump (FP), Heated Oxygen Sensor (HO2S)


    Control Module 20


    19 - Coolant Fan, A/C Relay (30) 30


    20 - Brake Lights (30) 10


    21 - Interior Lights, Clock, Luggage Compartment


    Light (30) 15


    22 - Cigarette Lighter, Radio, Luggage Compartment


    Release 10





    Separate Fuses





    (Located above the relays)











    - Fuse for ABS hydraulic pump relay 30


    - Fuse for ABS main relay 30


    - Fuse for A/C 30


    - Fuse for power windows 20


    - Fuse for cruise control 5


    - Fuse for cigarette lighter 15





    In the engine compartment above the brake booster:








    - Glow plugs 50





    Note: The Glow plug fuse should be changed by your authorized Volkswagen dealer only.


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Hey I have a 1998 jetta tdi and I cant seem to find the starter relay some help plz

Posted on Nov 26, 2014

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  • Master
  • 1,596 Answers

With Your Email Address I can Send you ANY & ALL Technical Info / Diagrams To Your GLO-PLUG
System, What I Have is too Larg to send through "FixYa's" little Channels

Posted on Jan 17, 2009

  • Ronnie Wilson Jan 17, 2009

    RE: Diagrms / INFO My E mail Is the nickname here @aol.com

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  • 199 Answers

Pull the harness off. turn the hand toward the engine and put the fingers under the harness and pull up gently. On the glow plug their is a place to insert an open end wrench. It's about 10 millimeters, Turn to the left. That is about all their is to it.
---------------
Glow plug shorted to ground causing the internal fuse of the glow plug control module to burn out. Replace the shorted glow plug as well as the glow plug control module. The following test procedure should be used to identify the shorted glow plug: Disconnect the 6-pin output connector of the glow plug control module. Use a 12 gauge wire and a 15 Amp in-line fuse to connect the positive side of the battery with one pin of the connector going to the glow plug. If the fuse burns out within 10 seconds, the glow plug is shorted and must be replaced. Repeat that procedure for every pin going to each glow plug. It is necessary to check each of the glow plugs for being shorted. If this is not done, the shorted glow plug will damage the new glow plug control module.
----------------
for how to check out the glow plug wiring just click this link and read the instructions with diagrams and follow the steps properly
http://vincewaldon.com/index.php?option=com_content&task=view&id=30&Itemid=28

thanks.

Posted on Jan 17, 2009

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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Would it have a Glow plug Control Module? If yes and it is faulty, that would explain why "power at the connectors... temperature sensor un plugged".

Good luck and Thank you for using FixYa.

Posted on Jan 17, 2009

  • Louie  Role
    Louie Role Jan 18, 2009

    My apologies for not being more specific. The wiring, the modules and the general electrical layout of most Jetta TDIs would be specific to:


    • country of origin/manufacture;

    • region of intended use.
    That beings said, then possibilities for your Jetta would be:


    • Glow plug Control Module, in the windshield wiper motor area, made by Bosch;

    • part of the ECU.
    As VW only made a comeback in my country mid 2000, earlier models are rather rare. On models that has the Glow plug Control Module integrated with the ECU, most mechs (at least here) simply hardwire a manual switch to override the relay and switch the glow plugs longer (as to one's preference). This is due to ECU cost and availability. Some enterprising mechs incorporate an electronic time delay. Again, since most early models were purchased in the gray market, tech support is non-existent and the modifications to the wiring have to be "winged".

    Here is an example of a modification that might interest you.

    Cheers.


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  • Master
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Hi!
The glow plug relay is not powered directly by the ignition switch. Power comes from fuse S176 on top of the battery for the glow plugs. The coil of the relay is powered from relay 109 and switched by the ECU. However, it is safe to say that the ignition switch is not intended to power the glow plugs, the relay contacts are supposed to carry the load. The ignition switch might power the relay coil, but that load is less than 0.2 amps--very low.

Some of the relays in the VW can be plugged in up-side-down. In other words there is nothing to orient the relay contacts to the socket in which it is plugged into. Can you be certain that you are not orienting the relay incorrectly.

Posted on Jan 17, 2009

  • Rylee Smith
    Rylee Smith Jan 17, 2009

    Hi



    Check the amp draw on each individual glow plug. A normal glow plug will show a draw of about 9 amps (On initial application of power, the amp draw will spike high until the glow plug begins to heat. A typical spike can run as high as 19 amps).

    Check the glow plug wiring and connections for damage, looseness or corrosion.

    A difference in amperage draw of 3 amps between glow plugs can cause a code P0380 to set. Be sure that all glow plugs are within 3 amps of each other on initial application of power and also during normal glow period.

    If glow plugs fail testing, always replace them as a set.

    If you have further questions please post back

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Check the fuses if they are blown out this can be the problem.Follow the glow plug supply wire from the engine to the firewall. The small box mounted there has the fuse mounted under the cover. replace the fuse if seems to be faulty.

Posted on Jan 17, 2009

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  • 108 Answers

And again, defective temp sensor. Not uncommon occurance.

Posted on Jan 17, 2009

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A panel just above the gas and brake pedals needs to be removed. Follow your steering wheel down. There are about 3 torque-head screws that hold it on. When the panel is off, you must look up inside. I believe the glow plug relay is (150). There is also a (109) relay that make give you problems down the road, consider changing this also. The 150 relay tends to be a expensive. Before you replace it, make sure your glow plug harness is not to blame.

Posted on Jan 17, 2009

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  • Master
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Welcome to Fixya! You have gotten a bad Temp. Sensor. It is not unusual for this to happen. Replace it with another one and it will work.

Posted on Jan 17, 2009

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The new temperature sensor would appear to be defective

Robert

Posted on Jan 17, 2009

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  • Roberta Smith
    Roberta Smith Jan 17, 2009

    Have you checked the fusable link located about dead center on the firewall ?



    Robert

  • Roberta Smith
    Roberta Smith Jan 17, 2009

    further this... there are two sensors on the heater outlet... are you changing the one with the blue/white wire ?



    Robert

  • Roberta Smith
    Roberta Smith Jan 17, 2009

    Do all of the glow plugs heat up... one may be bad

    also check the relay for corrosion and that the pins inside the fuse box haven't pushed in... easliy done by checking for signal to the relay...

  • Roberta Smith
    Roberta Smith Jan 17, 2009

    And one more thing to try... unconnect the temperature sender lead and leave unconnected... turn on the key and wait about 7 to 10 seconds... try and start the motor



    Robert

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