VOLVO XC70 2006 185 HP diesel The glow plugs have a low inner resistance in order to obtain faster heating and consequently a rapid start of the engine and low emissions. The glow plugs are designed for a continuous voltage of 4.4 volts. Rapid heating is obtained by supplying the glow plugs with an "overvoltage" of 12 volts. A temperature of approx. 1000°C is reached after approx. 3 seconds. After the glow plugs have initially been supplied with power at 12 volts the voltage is reduced after approx. 1.5 seconds to approx. 9 volts. After a further few tenths of a second the voltage is reduced further to a nominal 4.4 volts. Control The ECM calculates when/how the glow plugs should be supplied with power. The required voltage level is sent as a PWM signal to the glow plugs' relay/control module. In turn the glow plugs' relay/control module controls the glow plugs, also using a PWM signal. The glow plugs' voltage level is controlled based primarily on engine speed, outside temperature, engine temperature, injection quantity (mass) and time. Example: Heating "Pre glow" and "Readiness" When the ignition key is turned from position 0 or I to position II the glow plugs are activated for a maximum of 15 seconds if the outside temperature falls below + 5°C. Above + 5°C no heating is allowed. This temperature limit is however adapted to the current altitude. At an altitude of 3000 metres above sea level for example heating is permitted at an outside temperature of +20°C. The first three seconds of the preheating period are indicated in the DIM and this is called "Pre glow". After three seconds the heating changes over to a mode called "Readiness". "Start glow" and afterglow "Post glow" The glow plugs are also activated in ignition position III. The period is called "Start glow". Maximum time in this phase is 90 seconds. When the engine has started the control of the glow plugs changes over to afterglow, the so-called "Post glow" mode. Good starting properties are obtained by means of the glow plugs also being activated after the engine has started (i.e. reaching approx. 400 rpm = CAN signal "Engine running"). The temperature is initially 1000°C. After 15 seconds the temperature is lowered to 950°C. After a further 75 seconds the temperature is lowered to 850-900°C. In "Post glow" the glow plugs are activated for a maximum of 180 seconds. Several examples that affect the heating: • No heating is allowed if the engine temperature exceeds +30°C. • "Post glow" is calibrated for different environments and continues for a maximum of 180 seconds. Included in the calculated time are parameters such as coolant temperature, outside temperature and altitude. • The heating is switched off at an engine speed above 4000 rpm. If the engine speed decreases then heating is resumed. The period for which the glow plugs were not activated is also included in the total glow duration. • If the injected quantity exceeds 50 mg per operating cycle and cylinder then the heating is temporarily halted. (Full load is approx. 65 mg). If the injected quantity returns to below 50 mg then heating is resumed. The period for which the glow plugs were not activated is also included in the total glow duration. • Irrespective of the glow duration, the glow plugs' relay/control module compensates for voltage variations during heating, both high and low voltages. This is so that the glow plugs shall always work with the correct output. The glow plugs have full functionality down to 8 volts and limited functionality from 8 volts down to 6 volts. • There is a function in the engine control module (ECM) that calculates the amount of energy in the glow plugs during "Pre glow". When heating is interrupted and then resumed after a short time then the amount of energy supplied is adapted so that the glow plugs attain the required energy. This is to prevent the plugs from being supplied with a too high voltage and thereby reaching too high temperatures. (The glow plugs can manage 1130°C and are destroyed at approx. 1200°C). By calculating how much the temperature of the plugs has fallen during the shutdown period the supply voltage is adapted so that the temperature of the plugs does not become too high. • During regeneration the glow plugs are activated with a small load for example. By increasing the engine's load the temperature of the exhaust gases also increases which is necessary to obtain a correct regeneration process. Glow plug relay/control module for glow plugs The relay/control module for glow plugs contains powerful transistors (MOSFET) which each supply their own glow plug. There is a shunt for each glow plug that is used to diagnose the plugs in the event of short circuit and open circuit. Any diagnostic trouble codes (DTC) are sent to the ECM where they are stored.
@@JustMe6904GitarosPamokos hello, I have a renault megane 62plate. It has a key fob. The glowplug light will only come on when I press brake and then start button. It stays on for 1.5secs. Is there anyway to over ride this to get more time for them to heat up?? Thanks in advance.
If I could wait, I would. My car has push-button start and the ECU starts cranking when it decides the glowplugs are heated enough. It's never failed to start quickly so I guess it's not a problem.
I was always told the relay box stops voltage/heating going to the glow plug after the light on the dashboard goes out to prolong glow plug life and a safety feature wto make sure the glow plug does not stay on and burn out.
Check first if its really bad. There ar several things that may affect engine's start. Starter's crank RPM, compression in cilinders, injection quality, fuel pressure, glow plugs.
Most modern cars have variable pre-glowing time based on engine and outside temperature. And it’s much shorter then displayed in this video. Couple of seconds maximum.
Yes, but any way power goes to the glow plugs about 25 seconds. So if you want better heated combustion chamber- its better prolong heating than make a multiple preheat. This advice is for those, who have problems with cold start on older diesel cars.
@@JustMe6904GitarosPamokos I understand, would be nice it would still work this way. Also i can’t change the glowing time anymore with diagnostic software.
I don't know, but it's easy to check- connect the bulb on long wire to the glow plug and place it outside. Then you'll see if the light turns on when you unlock and open the door.
Stupid Manufactures... Everyone and their Dog thinks they stop when the dashboard light goes off... And we do put the contact on and off 5 times for 5 second intervals.... Fucking Amazing...
Wrong conclusion. Compression strokes during start heat up air in combustion chamber - so first working cycle (engine starts) more possible before glow plug switch off i.e. sooner 20 secs. Better to think before to say something, errr.., not correct exactly ;)
Next time, better think before writing a comment. I didn’t suggest waiting for the glow plugs to turn off. A better heated combustion chamber improves engine starting and it’s better anyway than trying to start the engine too soon.
@@JustMe6904GitarosPamokos OK, let say engine manufacturers force us to start diesel unreasonably early? Mymy! We are fooled again! This is not otherwise than a conspiracy!
You solved my every confusion bro thank you
Hope you are doing ok! Wish u the best
Impressive
VOLVO XC70 2006 185 HP diesel
The glow plugs have a low inner resistance in order
to obtain faster heating and consequently a rapid start
of the engine and low emissions.
The glow plugs are designed for a continuous
voltage of 4.4 volts.
Rapid heating is obtained by supplying the glow
plugs with an "overvoltage" of 12 volts.
A temperature of approx. 1000°C is reached after
approx. 3 seconds.
After the glow plugs have initially been supplied with power at 12 volts the voltage is reduced after approx.
1.5 seconds to approx. 9 volts.
After a further few tenths of a second the voltage is reduced further to a nominal 4.4 volts.
Control
The ECM calculates when/how the glow plugs should be supplied with power. The required voltage level is
sent as a PWM signal to the glow plugs' relay/control module. In turn the glow plugs' relay/control module
controls the glow plugs, also using a PWM signal.
The glow plugs' voltage level is controlled based primarily on engine speed, outside temperature, engine
temperature, injection quantity (mass) and time.
Example:
Heating "Pre glow" and "Readiness"
When the ignition key is turned from position 0 or I to position II the glow plugs are activated for a
maximum of 15 seconds if the outside temperature falls below + 5°C. Above + 5°C no heating is allowed.
This temperature limit is however adapted to the current altitude. At an altitude of 3000 metres above sea
level for example heating is permitted at an outside temperature of +20°C.
The first three seconds of the preheating period are indicated in the DIM and this is called "Pre glow".
After three seconds the heating changes over to a mode called "Readiness".
"Start glow" and afterglow "Post glow"
The glow plugs are also activated in ignition position III. The period is called "Start glow". Maximum time
in this phase is 90 seconds.
When the engine has started the control of the glow plugs changes over to afterglow, the so-called "Post
glow" mode.
Good starting properties are obtained by means of the glow plugs also being activated after the engine has
started (i.e. reaching approx. 400 rpm = CAN signal "Engine running").
The temperature is initially 1000°C. After 15 seconds the temperature is lowered to 950°C. After a further
75 seconds the temperature is lowered to 850-900°C.
In "Post glow" the glow plugs are activated for a maximum of 180 seconds.
Several examples that affect the heating:
• No heating is allowed if the engine temperature exceeds +30°C.
• "Post glow" is calibrated for different environments and continues for a maximum of 180 seconds.
Included in the calculated time are parameters such as coolant temperature, outside temperature and
altitude.
• The heating is switched off at an engine speed above 4000 rpm. If the engine speed decreases then
heating is resumed. The period for which the glow plugs were not activated is also included in the
total glow duration.
• If the injected quantity exceeds 50 mg per operating cycle and cylinder then the heating is
temporarily halted. (Full load is approx. 65 mg). If the injected quantity returns to below 50 mg then
heating is resumed. The period for which the glow plugs were not activated is also included in the
total glow duration.
• Irrespective of the glow duration, the glow plugs' relay/control module compensates for voltage
variations during heating, both high and low voltages. This is so that the glow plugs shall always
work with the correct output. The glow plugs have full functionality down to 8 volts and limited
functionality from 8 volts down to 6 volts.
• There is a function in the engine control module (ECM) that calculates the amount of energy in the
glow plugs during "Pre glow".
When heating is interrupted and then resumed after a short time then the amount of energy supplied
is adapted so that the glow plugs attain the required energy.
This is to prevent the plugs from being supplied with a too high voltage and thereby reaching too
high temperatures. (The glow plugs can manage 1130°C and are destroyed at approx. 1200°C).
By calculating how much the temperature of the plugs has fallen during the shutdown period the
supply voltage is adapted so that the temperature of the plugs does not become too high.
• During regeneration the glow plugs are activated with a small load for example. By increasing the
engine's load the temperature of the exhaust gases also increases which is necessary to obtain a
correct regeneration process.
Glow plug relay/control module for glow plugs
The relay/control module for glow plugs contains powerful transistors (MOSFET) which each supply their
own glow plug. There is a shunt for each glow plug that is used to diagnose the plugs in the event of short
circuit and open circuit. Any diagnostic trouble codes (DTC) are sent to the ECM where they are stored.
Thanks Man
Short video and to the point! Nice. Thumbs up ;-)
Thank you.One more
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This wideo is what i need & searching for. Thanks :D
Then you may need this too
ruclips.net/video/Kjuicmc6-ZA/видео.html
@@JustMe6904GitarosPamokos hello, I have a renault megane 62plate. It has a key fob. The glowplug light will only come on when I press brake and then start button. It stays on for 1.5secs. Is there anyway to over ride this to get more time for them to heat up??
Thanks in advance.
thank you nice introduction
That was as useful as a head full of DUD plugs.
great video,cheers
Thnx 😉👌
Why my montero hard starting in the morning
Does this mean that it’s ok for the Glow light to show on the dashboard for 30seconds after I turn on the car engine ?
If it shows the real preheat and afterglow time, then its ok.
thanks
If I could wait, I would. My car has push-button start and the ECU starts cranking when it decides the glowplugs are heated enough. It's never failed to start quickly so I guess it's not a problem.
Wow, your car is from the future, lucky you !!! 😆😅😄
Its because you push the break pedal as i assume its an auto.
If you just press start stop without the pedal it will not start but heat up!
I was always told the relay box stops voltage/heating going to the glow plug after the light on the dashboard goes out to prolong glow plug life and a safety feature wto make sure the glow plug does not stay on and burn out.
The glow plug starts to heat up again when the engine is started and warms up for another minute
How can it when the relay knocks the glow plug off?
@@GRACEORT watch this ruclips.net/video/Kjuicmc6-ZA/видео.html
Good to know
On my 2010 Renault Clio all the lights go out after about 5 seconds. Should I replace the plugs at 70,000 as I have trouble starting at 0 degrees C ?
Check first if its really bad. There ar several things that may affect engine's start. Starter's crank RPM, compression in cilinders, injection quality, fuel pressure, glow plugs.
After engine start glow plug works in any circumstances?!
I'm not sure abaut all cars, but usualy afterglow works for some time after engine was started even in summer time.
my vehicle heater symbol 15 secon ds after off vehicle not a pickup please explain problem
Some systems, like in my car indicator doesn't know if glow plugs are working so need to check if the glow plug is really hot.
Hello
Hi,
Identical operation on OM 611 CDI engine.
Why is it so, the relay box is damaged?
Everything is OK. Video made for drivers to know that preheat continues for about 20 seconds even after indicator turns off.
@@JustMe6904GitarosPamokos but japan cars shows real time i guess... their indicators glows long time :D
Most modern cars have variable pre-glowing time based on engine and outside temperature. And it’s much shorter then displayed in this video. Couple of seconds maximum.
Yes, but any way power goes to the glow plugs about 25 seconds. So if you want better heated combustion chamber- its better prolong heating than make a multiple preheat. This advice is for those, who have problems with cold start on older diesel cars.
ruclips.net/video/hYNb8pjUJFc/видео.html
@@JustMe6904GitarosPamokos I understand, would be nice it would still work this way. Also i can’t change the glowing time anymore with diagnostic software.
It's true that the BMW diesel engines start heating glow plugs after you unlock the car and open the doors?
I don't know, but it's easy to check- connect the bulb on long wire to the glow plug and place it outside. Then you'll see if the light turns on when you unlock and open the door.
Vw Audi does it I'm sure. About bmw not.
@@ForWhhY does this apply to the CR TDI engines? (haven't noticed it on the old 1.9)
I think that’s the fuel heater, that goes on, when you open the door, I think.
Stupid Manufactures... Everyone and their Dog thinks they stop when the dashboard light goes off...
And we do put the contact on and off 5 times for 5 second intervals.... Fucking Amazing...
That's why i made this video ;) next my video shows multiple preheat vs continuous preheat .
Good joke abaut their dog 👍😆👍😅👍😄👍😃
Paano tangalin Ang heater plug,bakit naiiwan Ang nada git na ty
The glow plug indicator takes more time to turn off
Yes, but it doesn't meen that the glow plugs are max temperature. Old glow plugs take more time to reach max temperature.
Oh. So they're not always on?
Only before cold start +5°C and lower, and for some time after start, untill coolant reaches needed temperature.
thanks
Madt
Wrong conclusion. Compression strokes during start heat up air in combustion chamber - so first working cycle (engine starts) more possible before glow plug switch off i.e. sooner 20 secs. Better to think before to say something, errr.., not correct exactly ;)
Next time, better think before writing a comment. I didn’t suggest waiting for the glow plugs to turn off. A better heated combustion chamber improves engine starting and it’s better anyway than trying to start the engine too soon.
@@JustMe6904GitarosPamokos OK, let say engine manufacturers force us to start diesel unreasonably early? Mymy! We are fooled again! This is not otherwise than a conspiracy!
ruclips.net/video/hYNb8pjUJFc/видео.html
ruclips.net/video/59xxQZNOHjg/видео.html
ruclips.net/video/6ULKMsSnYH4/видео.html
Madt