Question about 2003 Volkswagen Jetta TDI

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Glow plug indicator blinking

The curly light that comes on to show the glow plugs are warming the engine is now blinking non stop. Any ideas why?

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Your glow plugs are going bad and need to be replaced. This is a sign to you that they are basically running all the time because they dont know that thye are heated up and the car is running. Common problem with diesels

Posted on May 28, 2009

  • Danie Apr 28, 2013

    What about the sensor or relay??

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I have a 1997 Nissan atlas truck which has the exhaust brake light and glow plug lights flashing on the dash after starting the truck does anyone have an idea what that is caused by. Thanks


The glow plug light will stay on till warmed and the go out. Exhaust brake light should go out at the same time, when engine warmed. The glow plug light action is normal t stay on for a bit longer cause it's still warming and needs the heat from them.

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I got a jeep wrangler unlimited 2008, glow plug indicator light shows up when the engine is cold but after it has run for sometimes and the engine


Sounds like a diesel. Glow plugs usually need to be warmed up before starting an engine. Smaller diesels either warm up quicker or it is less critical than a tractor trailer. So either your glow plug light is normal letting you know it needs time to warm up or it's letting you know they are weak and need to be replaced. I'd check the owners manual to be sure.

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Glow plug light comes on then off


The glow plug light comes on to show that the glow plugs are warming up. You should not start the vehicle until the light turns off, as it can damage your glow plugs. The light should turn off after a few seconds while the ignition switch is in the on position. In short the vehicle is working properly.

Nov 11, 2012 | 1992 Ford F250

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The diagram in my haynes manual does not show some parts that are in my 2001 jetta tdi 1.9 turbo. i ran a diognostic and it says glow plug curcuit a malfunction, i changed the plugs and tested the coolant...


In addition to the 4 primary glow plugs, the cooling system also has 3 Coolant Glow Plugs to help provide extra heat to the cooling system in order to warm-up the vehicle's interior more quickly, and enhance overall engine warm-up time. (Example - Some Mercedes diesel engines use electrical heaters in the cabin because their engine is so thermally efficient.)
Likewise, this auxiliary source of heat from the 3 Coolant Glow Plugs is necessary because of the VW 1.9 TDI engines outstanding efficiency, which wastes very little heat.


The 3 Auxiliary Coolant Glow Plugs are located at the end of the aluminum cylinder head (in a protruding flange) directly below the vacuum (brake booster) pump, which also connects to a coolant hose.

tdisline_301.jpg
The 3 Auxiliary Coolant Glow Plugs use two (underhood) relays which are monitored and controlled by the ECU. During a cold start, the vehicle's interior temperature selector switch helps the ECU choose one of three modes depending on the amount of heat required to warm-up the coolant.

For example, Coolant Glow Plug #1 can be selected to operate all by itself, or #2 and #3 can operate together as a two-some, or lastly, all three glow plugs can form a triple source of heat for maximum enhancement of engine warm-up time.

After the engine is completely warmed up and the thermostat is open, the Coolant Glow Plugs normally shut-off and remain off unless the (thermally efficent) engine cools down sufficiently to have the computer signal them to come back on to keep the engine and cabin air warm. Extensive idling times at stop lights or in the driveway are scenarios where these glow plugs are most likely to recycle on and off.

In conclusion, the period of Preglow and Afterglow is determined by the engine's coolant temperature (during a cold or hot start), which helps the ECU select a predetermined time-cycle for the combustion chamber and / or Auxiliary Coolant Glow Plugs to follow.

Finally, one myth that needs to be immediately debunked, is the belief that the TDI's advanced Glow Plug System is linked to the opening of the driver's side door, which is false! It is also noteworthy to mention that some earlier VW diesel glow plug systems were operated in this manner, but not so with the advanced VW Jetta 1.9 TDI engine.

Feb 23, 2011 | Volkswagen Jetta Cars & Trucks

1 Answer

Where are the three glow plugs that are used for the heater/cooling located on an 02 vw jetta 1.9L tdi?


In addition to the 4 primary glow plugs, the cooling system also has 3 Coolant Glow Plugs to help provide extra heat to the cooling system in order to warm-up the vehicle's interior more quickly, and enhance overall engine warm-up time. (Example - Some Mercedes diesel engines use electrical heaters in the cabin because their engine is so thermally efficient.)
Likewise, this auxiliary source of heat from the 3 Coolant Glow Plugs is necessary because of the VW 1.9 TDI engines outstanding efficiency, which wastes very little heat.


The 3 Auxiliary Coolant Glow Plugs are located at the end of the aluminum cylinder head (in a protruding flange) directly below the vacuum (brake booster) pump, which also connects to a coolant hose.

tdisline_102.jpg
The 3 Auxiliary Coolant Glow Plugs use two (underhood) relays which are monitored and controlled by the ECU. During a cold start, the vehicle's interior temperature selector switch helps the ECU choose one of three modes depending on the amount of heat required to warm-up the coolant.

For example, Coolant Glow Plug #1 can be selected to operate all by itself, or #2 and #3 can operate together as a two-some, or lastly, all three glow plugs can form a triple source of heat for maximum enhancement of engine warm-up time.

After the engine is completely warmed up and the thermostat is open, the Coolant Glow Plugs normally shut-off and remain off unless the (thermally efficent) engine cools down sufficiently to have the computer signal them to come back on to keep the engine and cabin air warm. Extensive idling times at stop lights or in the driveway are scenarios where these glow plugs are most likely to recycle on and off.

In conclusion, the period of Preglow and Afterglow is determined by the engine's coolant temperature (during a cold or hot start), which helps the ECU select a predetermined time-cycle for the combustion chamber and / or Auxiliary Coolant Glow Plugs to follow.

Finally, one myth that needs to be immediately debunked, is the belief that the TDI's advanced Glow Plug System is linked to the opening of the driver's side door, which is false! It is also noteworthy to mention that some earlier VW diesel glow plug systems were operated in this manner, but not so with the advanced VW Jetta 1.9 TDI engine.

Dec 16, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

Hi i have a VW SHARAN 02, glow plug light...


your glow plug relay is going out you need to replace it.

Jan 30, 2010 | 2001 Volkswagen Jetta TDI

2 Answers

Heater plugs for nissan terrano 2


i have a nissan terrano 2.7 dti heater light not coming on some times dose and some times does'nt and it wont start

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Engine light and emmisions worshop on dash


You will need to have another code scan done. A faulty glow plug will certainly show up on a scan, but should NOT bring on the engine MIL light. Erase all faults showing at present. This should extinguish the engine light. Thin start and stop engine a number of times until the light comes back on. This will re boot on-board computer. Do another scan and the fault should show up. If possible do a live reading, paying close attention to the (oxygen sensors) lambda units
Best of luck
John

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1 Answer

02 VW Jetta TDI with ALH engine glow plug


this is a common problem for these cars glow plugs go bad like spark plugs however the smoke would lead to bad mass airflow meter. it is not telling ecu corrcet miss. disconnect mass airflow meter. when cold see if this makes it start better. it should would means you need new m.a.f. glow plug issue take a test light place clamp on positive of battery then pull off glow plug connectors place tip of test light on glow plug the bad one will have a dull light unlike the good one which will be brighter. will need new plugs and wire harness four **** connectors and wire striper and crimper will fix concern good luck

Sep 01, 2009 | 2002 Volkswagen Jetta TDI

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