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Glow plug light not coming on, and unable to

Glow plug light not coming on and unable to comunicate with ecu.

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Wut kid of car truck?

Posted on May 14, 2010

  • pixsou Feb 14, 2011

    isuzu gmc w3500 2000

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Got a Renault kangoo 1.7dci the glow light does not go off although van starts ok and seems to drive fine


Best to have the ECU and IP scanned. IP could have shorted leaving the light on. If a relay is stuck or ECU keeps the glow plugs hot. This will eventually burn out the glow plugs.

Oct 15, 2016 | Renault Cars & Trucks

1 Answer

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

I have a 2000 Jetta diesel. Can you tell me where the plug for the block heater is? If indeed there is one.


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_180.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.




Please do rate my response. Thanks!

Jan 23, 2011 | 2000 Volkswagen Jetta TDI

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

Glow plug light not coming on, and unable to comunicate with ecu.


GLOW PLUG LIGHT BULB IS BLOWN.IF BULB IS GOOD BUT GLOW PLUG LAMP FAILS TO LIGHT PROBLEM COULD BE ECM OR GLOW PLUG RELAY.

Mar 19, 2010 | 2002 Renault Sportwagon

1 Answer

My ECM is not comunicating with my glow plug relay. I replaced ecm and still get no power to my glow plugs. I tried an ecm from another 02 F-350 PS and it works fine but the programs in the two ecm's are...


As I understand these systems the ECM is not what powers the glow plug relay. Any kind of engine controls happen after the engine starts.

There should be a power relay which feeds the juice to the glow plug relay. When you turn the keyswitch to start and the light for the glow plugs goes out you should hear a clicking as the glow plug timer cycles juice to the glow plugs.

The glow plug side is a separate system from the fuel management side. Someone should check the glow plugs to see if each is good. The diesel system used to be simple and it sounds like you are complicating what should be a simple repair. I could be wrong, but it does not sound like the Dealer is selling you the parts you need.

A diesel needs a heated combustion chamber to initially fire and then it runs by compression. Perhaps if you change the power relay from the vehicle you removed the ECM from and tried it in your truck it would work with your old ECM.

Jul 10, 2017 | 2002 Ford F350 Super Duty DRW Reg. Cab

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

2 Answers

P00090, P1352


Hi, if you have any engine managment lights come on this is telling you that the E.C.U the brain has to speak theres a fault, you should take it to a garage so that they can do a diag with there computor to find out where the trouble is.
hope this helps you.
George.

Jul 15, 2009 | 1999 Suzuki Grand Vitara

1 Answer

Glow plug light comes on during driving my 2003 vw golf 1.9 diese


this is going to sound nuts but make sure brakelight switch is not faulty.it is tied in with the ECU will set glow plug light or cause a no start

Nov 24, 2008 | 2003 Volkswagen Golf

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