Really great video. My brain can't quite wrap around one thing. Why does the current in the circuit stay constant? Is it a constant current supply? Or wait, the current actually goes up as the ECT resistance goes down, correct? However, since the circuit always has the constant resistor in it, the current can never really get high enough to overwhelm the wiring, right? Basically, as coolant temp goes up, total circuit resistance goes down, but current is capped at 8mA anyways with the given 12V supply and 1500Ohm constant resistor example, so current is always tiny. Is that correct?
@@jamesmahle1259 technically you could as normal resistors aren’t affected by polarity but in these circuits normally the sensor is designed in a way that the wiring plug can only go on one way
the circuit has 5 v0Its its pr0p0rti0naly shared between the 2 I0ads when the thermist0r I0ses resistance the 0ther resist0r uses m0re 0f the avaiIabIe. as it d0es the ecm Iearns the c00Iant temp
Hello on live data scanner my car show with around 20 degrees less than the dashboard. For example, on the dashboard, my car seems fully heated at 90 degrees but on live data on the scanner, it shows 70 degrees. I also get generic error P01EA which I believe is related to the coolant system. My car has unstable idle when getting hot and when is fully heated, my RPM are floating and sometimes the car shuts off. Is that normal? Can this cause my car to have unstable idle? Thanks!
Would be a good starting point, most cars will generally still start but run rough. If your sensor is broken it will default to think the engine is cold. Cold engines require more fuel so it’s likely injecting more fuel which is probably too much for the engine to start.
Hello! What could be to blame?! After a whole night, at 7 in the morning, when I put the tester on, the outside temperature is 8 degrees Celsius, but the antifreeze temperature is 13-15 degrees Celsius. When starting for the first time with the outside temperature between 5 and 15 positive degrees, after starting, if I try to accelerate, the engine speed fluctuates very badly. If the start-up takes place at outside temperatures below 5 degrees or above 15 degrees, then everything is ok! I changed the temperature probe with a new one OE Wv, checked the wiring and we have no problem, corrosion of connectors or anything else. What could be the cause?!!!!
Hey, what car and what engine is it. The outside temp should be reading similar to the coolant/engine temp in the morning, there may be 5c difference, just depends on climate conditions
It's Wv Jetta Mk6 2.0 Tdi 2013. I've also checked other cars and first thing in the morning they have at most the same antifreeze temperature as the outside temperature, if not 1 degree two lower. Is it possible that there is a fault in the temperature reading ECU that causes the engine speed to fluctuate when I start to accelerate, after the first cold start?!!! Thank you!
@@octaviansorescu7427 hey yes that could cause a fault, have you had any fault codes? I’d also check if it has a fuel temp sensor, what’s that reading, that should be similar to outside temp in the morning. Other things to check is missfires, any logged in the memory. I assume you have a fault code reader to check? fuel filter, when was that last changed? Dirty fuel filter can cause mystery running issues. Any fault codes for the glow plugs? If one of those isn’t working correctly that will cause running issues first thing. Also what is the intake air temperature? You should have a few temp sensors to check between. Ambient temp, intake air temp, coolant temp, fuel temp. Check that for now and if all ok next would be EGR system
Howdy! All other temperatures are very close to the ambient temperature: intake air temperature, fuel temperature, oil temperature, only the antifreeze temperature has a deficiency of 5-7 degrees higher than all the others. I have no error codes and the egr was changed to Origine Wahler recently. Ramp fuel pressure equal to specified, no problem injector correction!
It’s very useful me bro. I expect more video about sensors and convenience system electrical
Really great video. My brain can't quite wrap around one thing. Why does the current in the circuit stay constant? Is it a constant current supply? Or wait, the current actually goes up as the ECT resistance goes down, correct? However, since the circuit always has the constant resistor in it, the current can never really get high enough to overwhelm the wiring, right? Basically, as coolant temp goes up, total circuit resistance goes down, but current is capped at 8mA anyways with the given 12V supply and 1500Ohm constant resistor example, so current is always tiny. Is that correct?
Great video what if fans only turn on when AC is on. Otherwise i get overheating because thermostat won't open. Any ideas
Does the polarity of an ECT matter? If reversed, will in mess with the computer? Thank you
@@jamesmahle1259 technically you could as normal resistors aren’t affected by polarity but in these circuits normally the sensor is designed in a way that the wiring plug can only go on one way
How is possible that when the resistance reduced that voltage also reduced ?? Normally when the resistance goes down should the voltage increase.
the circuit has 5 v0Its its pr0p0rti0naly shared between the 2 I0ads when the thermist0r I0ses resistance the 0ther resist0r uses m0re 0f the avaiIabIe. as it d0es the ecm Iearns the c00Iant temp
Hello on live data scanner my car show with around 20 degrees less than the dashboard. For example, on the dashboard, my car seems fully heated at 90 degrees but on live data on the scanner, it shows 70 degrees. I also get generic error P01EA which I believe is related to the coolant system. My car has unstable idle when getting hot and when is fully heated, my RPM are floating and sometimes the car shuts off. Is that normal? Can this cause my car to have unstable idle? Thanks!
I took mine out of my vw golf 1.9 tdi mk5 and some light oil came out similar to 3 in 1 oil. How do I refill it?
Shouldn’t be any oil in the coolant sensor or the coolant system
Plz type into the close captioning "Video 2 of 3".
I have 2004 honda fit .this sensor is broken .an my car want start .is the sensor causing it ?
Would be a good starting point, most cars will generally still start but run rough. If your sensor is broken it will default to think the engine is cold. Cold engines require more fuel so it’s likely injecting more fuel which is probably too much for the engine to start.
@@GarageTechAutomotive camsensor wire did cut
@@daverobinson7356 👍🏼
Hello! What could be to blame?! After a whole night, at 7 in the morning, when I put the tester on, the outside temperature is 8 degrees Celsius, but the antifreeze temperature is 13-15 degrees Celsius. When starting for the first time with the outside temperature between 5 and 15 positive degrees, after starting, if I try to accelerate, the engine speed fluctuates very badly. If the start-up takes place at outside temperatures below 5 degrees or above 15 degrees, then everything is ok! I changed the temperature probe with a new one OE Wv, checked the wiring and we have no problem, corrosion of connectors or anything else. What could be the cause?!!!!
Hey, what car and what engine is it. The outside temp should be reading similar to the coolant/engine temp in the morning, there may be 5c difference, just depends on climate conditions
It's Wv Jetta Mk6 2.0 Tdi 2013. I've also checked other cars and first thing in the morning they have at most the same antifreeze temperature as the outside temperature, if not 1 degree two lower. Is it possible that there is a fault in the temperature reading ECU that causes the engine speed to fluctuate when I start to accelerate, after the first cold start?!!! Thank you!
@@octaviansorescu7427 hey yes that could cause a fault, have you had any fault codes? I’d also check if it has a fuel temp sensor, what’s that reading, that should be similar to outside temp in the morning. Other things to check is missfires, any logged in the memory. I assume you have a fault code reader to check? fuel filter, when was that last changed? Dirty fuel filter can cause mystery running issues. Any fault codes for the glow plugs? If one of those isn’t working correctly that will cause running issues first thing. Also what is the intake air temperature? You should have a few temp sensors to check between. Ambient temp, intake air temp, coolant temp, fuel temp. Check that for now and if all ok next would be EGR system
Howdy! All other temperatures are very close to the ambient temperature: intake air temperature, fuel temperature, oil temperature, only the antifreeze temperature has a deficiency of 5-7 degrees higher than all the others. I have no error codes and the egr was changed to Origine Wahler recently. Ramp fuel pressure equal to specified, no problem injector correction!
@@octaviansorescu7427 was you getting the same reading with the old temp sensor? Might be worth putting another sensor in just to make sure.