Question about 2002 Volkswagen Golf

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Diesel Cold Starting

Power to glow plug rail when engine coolant temp sensor is disconnected. When sensor connected there's no power at all. It's the same with a different sensor.

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Ecu is not pulling the earth properly(common)lots of people live with it or have it sent for repair...

Posted on Jan 04, 2009

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Posted on Jan 02, 2017

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Why are my glow plug light is flashing all the time and on first start in morn it coughs and splutters and smokes bad from exhaust wat is wrong had coolant temp sensor changed today please help im a female...


I think you are referring to a different indicator light. A glow plug is a Diesel engine part and I do not think an American version has a Diesel. There is a "check engine light" which is an indicator of trouble and will display as you described.

Go to a Advance , Autozone, or Oreilys autoparts store. You can ask for a free scan to diagnose your problems. The coolant sensor can relate to a cold start problem. Some models use 2 temperature sensors. One operates the dash gauge and the other operates engine controls.

You will need to know if you replaced the sensor to the dash gauge instead of the engine control sensor. Both use heat to set engine controls.

May 02, 2014 | Ford Cars & Trucks

2 Answers

This Sign appears on the dashboard , What Is the problem? VW eurovan


I m not familiar with VW Eurovan but, assuming your vehicle is diesel powered, I would say that the sign indicates a fault with the "pre-heaters" which should only come on when cold starting a diesel. Normally, this sign appears on switching on, and you wait until it goes out before starting.
Does this happen on your vehicle and, has this symbol previously gone out after a few seconds? There is a relay, on the starting circuit, which should cut these pre heaters, after a short while.
I see that your temp gauge shows 90 degrees so, he engine is hot.
Try disconnecting the leads to the glow plugs, check that the engine starts OK and see if the warning symbol disappears In warm weather you can leave the leads disconnected and, if you have a meter, check if there is still power to the glow plug leads after the engine has started. (a 12 v bulb and wire would do). It they are still powered, there is a fault with the glow plug relay.

Oct 06, 2012 | Cars & Trucks

2 Answers

Tdiclub.com


THE SMOKE YOU HAD IS BECAUSE MANY TRIES TO START COLLECTED FUEL IN THE COMBUSTION CHAMBERS AND SUDDENLY BURNT ON START. ANY WAY THE HESITATION OF CRANK START FOR LONG TIME CHECK WHETHER YOU DO NOT HAVE A PROBLEM WITH THE FUEL PUMP,FUEL FILTER OR COLD START SENSOR. CHECK YOUR SPARK PLUGS CLEAN THE THROTTLE BODY AND DO WITH SCANNER THE ADAPTATION.S

Aug 29, 2012 | 2001 Volkswagen Jetta TDI

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 2003 grand vitara td, since the onsetof the cold weather im having great difficulty getting it started. i have replaced the glow plugs and the battery is fine,i have checked the diesel feed to the...


there is a sensor in the cooling system for the glow plugs if it reads it is 80f it will not light the plugs ,.check to see if you get power to the glow plugs.if not go to the sensor or the computer.

Dec 21, 2010 | 2003 Suzuki Grand Vitara

2 Answers

Toyota hilux 3ltr diesel,i put new glow plugs in about 3 weeks ago & it fixed the starting problem going fine.now it just started not starting when it is cold checked wiring has power to glow plugs...


Double check your fuel filter and replace as necessary. Also replace your coolant temp sensor. I would also pull out each glow plug and bench test with heavy cables and make sure they do glow red. It very well could be a couple of the glow plugs have failed due to quality. Let me know what you find.

Apr 19, 2010 | 1999 Toyota 4Runner

1 Answer

2006 crv 2002 willnot start with turning key willstart with tow or short pushallparts of fuel (diesei)line cleaned pump&inj.test ok engine will turn when key is used key test ok test show lack of fuel...


hi if when engine starts and warms up it then runs ok ? then starts ok rest of day ? considering vehicles age/milage ? have you checked heater glow plugs ? you only need one glow plug to fail/ leak to earth on cyl head and this will knock out/ leak power to earth of all other g/plugs also consider the possibility that the engine coolant sensor ( not the temp sender) has gon faulty this sensor gives ecu signal to provide excess fuel for cold starting on cold starts and auto cuts off as coolant heats up? rather like using choke control on carbs years ago ? also diesels used to have excess fuel device on pumps on trucks in days gone by ? whick assisted in cold starting hope this info helps?

Feb 03, 2010 | 2006 Honda CR-V

2 Answers

2000 ford super duty 7.3 diesel will not cold start


you need to have the engine coolant switch checked,since the computer relies solely on sensors,the ect tells the computer how cold or hot it is so the computer will make it a rich or lean mixture to start the engine,if it tells the computer that it is 75 degrees the computer will lean the mixture like starting a car in the winter without a choke.

Jan 06, 2010 | 2000 Ford F350 Super Duty Super Cab

1 Answer

Car wont start diesel engine Could it be the 'glow plug'? what is a glow plug? how can i test?


A glow plug is a small heating element in the cylinder. It heats the diesel so that starting can be made easy. Is your car standing in the open frozen parking If yes, then it would require a lot of battery power to first heat all the cylinders and then turn the engine to start. What we do in such conditions is to light up some fire under the car and heat the fuel system enough for the diesel to warm up a little and thus save the battery for glow plugs. Generally, all vehicles have an indicator light which comes on when the glow plugs are ready for starting. The diesel will ignite on compression, but it has to reach the cylinder and thus has to be flowing. In cold it freezes and hence the need for glow plugs and the heat. If it is parked in heated parking then the need for glow plugs decreases.

Jan 01, 2010 | 1991 Peugeot 405

1 Answer

Glow plugs causing starting problem


if you need connectors and terminals for the glow plug connections under the valve cover, Ford sells then so you don't need a whole $600 harness.

info for your use

Section 03-07B: Glow Plug System 1996 F-250, F-350, F-Super Duty Equipped with 7.3L Diesel Engines Workshop Manual
DESCRIPTION AND OPERATION Glow Plug System The 7.3L diesel engine uses a glow plug system which preheats air in the combustion chamber to improve cold engine starting. The system consists of eight glow plugs, the glow plug control module (12B533), powertrain control module (PCM) (12A650), engine oil temperature (EOT) sensor and barometric pressure sensor (BARO sensor) (12A644). The glow plug system is electronically controlled by the powertrain control module. The powertrain control module energizes the glow plugs immediately after the key is placed in the ON position and then determines how long the glow plugs will be on according to the engine oil temperature and the barometric pressure. The required time for the glow plugs to be energized decreases as the engine oil temperature and barometric pressure increase. The glow plugs are self-regulating, and the powertrain control module controls relay ON time. The powertrain control module protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.

Possible Causes: Insufficient glow plug ON time will not allow enough heat to accumulate in the combustion chamber to easily facilitate starting. If the glow plug system ON time does not meet any of the specifications in the accompanying chart the problem is most likely a faulty wire harness connection, ground connections or glow plug relay.

If the glow plug resistance to ground is high, the most likely causes are an open UVC (under valve cover) harness or open glow plug.
--------------------------------------------------------
Relay Operation
Install a DVOM on the glow plug feed side of the glow plug relay (large stud with two wires connected). Turn the ignition key to the ON position but do not attempt to start. Note the time in seconds from when the key is turned on and the glow plug relay energizes until the glow plug relay de-energizes. The glow plug relay makes a loud click noise which is easily heard when it energizes and de-energizes. The dome light will dim and the dash voltmeter will dip when the glow plugs are drawing current from the battery. Compare the times measured to the table (time will be affected by engine temperature, battery condition and vehicle altitude). The voltage at the glow plug feed terminal may vary from 9 to 12 volts depending upon battery condition.
--------------------------------------

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If battery voltage not present check for B+ at power supply terminal (terminal with single large wire). Power for glow plug power supply is supplied from starter relay through two fusible links at solenoid.
Glow Plug Operation
Disconnect all of the glow plug/injector harness connectors from the valve cover gaskets. With the pigtail installed, measure glow plug resistance to ground (preferably B-). A resistance measurement of .1 to 6 ohms indicates a good glow plug.



Glow Plug Harness Continuity
Measure for continuity from the connector harness to the glow plug feed terminal on the glow plug relay. Resistance should be less than 5 ohms.
Incorrect measurements will result if all glow plug/injector connectors to valve cover are not disconnected.

---------------------------------------------------
Glow Plug Relay The glow plug relay (12A343) has a plastic base and two mounting bolts. It is operated by the powertrain control module (PCM) (12A650) which senses engine oil temperature, PCM voltage and barometric pressure. When the engine oil temperature or the barometric pressure is low, the PCM activates the glow plug relay and the glow plugs. If the PCM voltage is too high, the powertrain control module deactivates the glow plug relay and the glow plugs immediately energize for a shorter duration, decreasing the modulation of the duty cycle.
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Glow Plug Removal
  1. stj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: THE RED-STRIPED WIRING HARNESS CARRIES 115V DC. SEVERE ELECTRICAL SHOCK MAY BE RECEIVED. DO NOT PIERCE.
    Remove valve cover (6582). Refer to Section 03-01D .
  1. Disconnect glow plug electrical connector using a pair of pliers.
  1. Remove glow plug using 10mm socket.
  1. Clean and inspect glow plug tip for damage. Replace if damaged.
Installation
  1. Install glow plug and tighten to 19 Nm (14 lb-ft).
  1. Connect glow plug electrical connector. Make sure glow plug wiring is routed to avoid moving parts.
--------------------------------------------------------------
Glow Plug Control Glow plugs are used to warm the cylinders to improve cold-engine starting. The PCM uses the engine oil temperature (EOT) sensor and barometric pressure (BARO) sensor to determine how long the glow plugs will be on. The PCM energizes the glow plugs longer if the engine is very cold or if the barometric pressure is low at high altitudes.
The PCM controls the relay that supplies power to the glow plugs with the glow plug control (GPC) signal. When the GPC signal is grounded by the PCM the relay closes, turning the glow plugs on.
The glow plugs are controlled by the following sequence:
  1. PCM energizes the glow plugs.
  1. The PCM energizes the glow plugs immediately after the ignition is placed in the ON position.
  1. The PCM then determines how long glow plugs will be on based on EOT sensor and the BARO sensor. The required time to warm up the cylinder decreases the engine oil temperature and barometric pressure increases at low altitudes.
Glow Plug Lamp Control The glow plug lamp (GPL) signal controls the WAIT TO START light located on the instrument panel. This light is used to indicate when to start the engine. The cylinders are being warmed by the glow plugs during and after this light is lit. The PCM energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.
When the GPL signal is brought low, the "Wait to Start" lamp is turned on.
The glow plug lamp is controlled by the following sequence:
  1. PCM lights the WAIT TO START light after a key on reset occurs.
The PCM determines the glow plug lamp activation time based on engine oil temperature, barometric pressure and battery voltage.
  1. PCM turns off the WAIT TO START light.
The glow plug lamp is turned off when the timer counts to the number of seconds specified by the PCM. The glow plugs will normally remain on longer than the "Wait to Start" lamp.
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Mar 14, 2009 | 2004 Ford F350

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