Hi everyone from Turkey,

 

I have a Skoda Felicia LX '97 with carburettor. What I want to know the engine coolant sensor pinout? Especially I need water temperature gauge pinout. Sorry for the inverted sentences.

 

Sample pic.

 

I think wrong in this picture. The correct pinout in that picture.

 

Sensor color is sample. My cars sensor has blue ring.

 

My cars temp gauge get the value of the bottom two pins but I don't know it's correct. For example hot engine values: bottom pins gives 240 ohm, upper pins gives 300 ohm. cold engine values: bottom pins gives 2560 ohm, upper pins gives 3190 ohm. I think upper pins gives correct value but correct wiring bottom pins.

 

Can you tell me the correct values?

 

Sorry for bad english

I looked at your topic on SkodaTurkey.com to understand better what is your problem.
 
http://www.skodaturkey.com/showthread.php?t=29690
 
Because your posts are probably translated using Google Translator, a few confusing information was introduced in your questions. I will try to clarify everything.
 
The color of the ECT sensor ring: on my car iit s YELLOW. My Felicia has a 135 type engine with carburetor. ECT sensors with a BLUE ring have different thermistor characteristic (resistance - temperature). You asked in another post what resistance values has an ECT sensor from Favorit. I answered your question and I told you the correct values for a Favorit car. The problem is that you asked the wrong question. You thought that an ECT sensor with yellow ring for Favorit is the same as an ECT sensor with yellow ring for Felicia. But that is not correct! Favorit and Felicia have different temperature gauges... so it is obvious they have different ECT sensors.

 

Conclusion: in order to show the correct temperature, the ECT sensor must be paired with the correct temperature gauge. There are 4 different temperature gauges made for Felicia depending on year, motorization, and level of equipment (LX/GLX). Similarly there are 4 different ECT sensors. There are 12 types of instrument clusters... yeah... it is quite a mess.

 

Note: If ECT sensor and temperature gauge are not paired correctly, the gauge needle will stay at 80C or 100C when the engine is warmed up. Normally it should stay halfway at 88-90C.

 

Now let's clarify the pinout for an ECT sensor with YELLOW ring for Felicia. You posted a temperature/resistance table in your topic from SkodaTurkey.com forum (I will insert it below). The table values are for the thermistor that sends data to ECU. In that table we see that we must measure between terminals 1&3. If you look at your original post, you'll see that is exactly what I indicated on my drawing. Pins 1 and 3 of ECT sensor are for ECU, meaning that pins 2 and 4 are for temperature gauge. But then you came with another photo of ECT sensor pins that contradicts the table.

 

Note: don't be confused by the pin numbers of the connector T4m. Connector pin numbers are not identical to sensor pin numbers. I've told you, Skoda messed things badly in ECT sensors area. Ring colors, pins, part numbers... it is very hard to order the right part.

 

The real problem: Forget about the pinouts. You should have asked this: "My temperature gauge behaves erratic. What can I do to fix it?" The answer is:

• check the ECT sensor (boil water in a pot then dip the metallic part of the sensor in it; the resistance at pins 2-4 should drop continuosly)
• check the wiring
• check the PCB of instrument cluster for cracks. The copper is VERY thin and cracks easily. Use an ohmeter and a magnifying glass. I marked on the PCB photo the tracks (yellow) to check. With cyan arrows I marked the weakest spots. Use a soldering pen with a thin tip, thin soldering iron, and a flux pen.

Edited 23 February, 201511 yr by RicardoM

Thank you for your so detailed explanation. Yes, I used google translated some sentences but it isn't enough i think. Sorry for that.

 

I did following for the temperature gauge;

 

1- I checked the wiring. It works fine.

2- I checked the cable connectors. Its works fine.

3- I checked the pcb. It works fine also.

4- I checked the sensor in diffrent water temp, probably It gives the wrong value. Only pin1-3 gives correct value but that for the ECU.

 

so I will have some questions for you;

 

1- What is the correct ect sensor for my felicia lx with carburetor? (135 type engine) Which color ring I should prefer? I'm confused at this point.

2- I understand correct pinouts are 2&4 I was wondering can you gauge your ect sensor (pin1-3 and pin2-4) and share to here? I would like to compare pin1-3 and pin2-4 values. 

Edited 23 February, 201511 yr by blauzahn

Before answering your questions, please confirm if I understood correctly your topic in SkodaTurkey.com forum.

- the temperature gauge doesn't show the correct temperature YES/NO

- sometimes the needle stays at 0 then suddenly jumps to 80 - 90C then drops etc YES/NO

 

If different behavior please describe.

-My cars temperature gauge doesn't show correct temperature. ECT Sensor value 250 ohm but temp.gauge show 70 degree. I will solve this problem using the resistance. 

 

-Yes, some time the needle was jumps but I solved this problem using a soldering iron on pcb gauge signals leg.

Edited 23 February, 201511 yr by blauzahn

My ECT has 2007 Ohm at 20C and 197 Ohm at 90C. It is easier to calculate what resistor to put in parallel than to order the correct sensor...

Edited 23 February, 201511 yr by RicardoM

Thanks Ricardo. These values will be helpful for me. 

Hi,

I lifted this old topic because it relates to my problem.

 

I have 1.3mpi felicia and problem is higher fuel consumption. Now it is around 8,2-8,6L/100km. Before has been nearer to 6L/100km. It is now winter in Finland so cold weather lifts it for sure. But wife says it got higher before cold weathers, and the change was rapid.

 

Temperature gauge is correct, just under 90, and ect gave 253Ohms.

But the other two pins that go to ECU, what resistance should they give? Now it was only 131Ohm.

I thought that if it gave wrong reading to ECU that could be reason.

26 minutes ago, julein said:

But the other two pins that go to ECU, what resistance should they give? Now it was only 131Ohm.

That is OK. If you look at the table above in this topic, the values for the ECU should be half from those for the temperature gauge.

So it's not the ECT.

There are other many other reasons (in a  very broad range) that could result in a higher fuel consumption such as:

• fuel leaks
• stuck (partially) open fuel injector
• faulty fuel pressure regulator
• bad ignition
• stuck brake
• etc.

You'll have to come up with more information after testing the car and/or thinking of other prior events that might be related. A simple observation from your wife is not enough to solve the issue.

Thank you! 

Was hoping for easy solution, but unfortunally not this time either...

 

Car doesn`t seem to leak, dry underneath. But will check once more.

 

Strange thing, car was just in yearly vehicle inspection and passed gas check. Can`t remember the CO values, but under 0,5% and 0,3%. HC was around 80ppm. So it should run with right mixture I think. 

Brakes work fine.

 

I took the car in my own use, so hopefully I will find out something later either driving it or checking it. 

 

Ect has been causing trouble with other cars so thats why I was interested of that first, thank you for clearing that.

20 hours ago, julein said:

Was hoping for easy solution, but unfortunally not this time either...

Now really... what would you expect? "There is a big switch marked ON/OFF in the engine bay that you should turn to OFF" ? I'm not sure what other prior issues necessitated a complicated solution too but in this case a very generic "my wife says the fuel consumption is suddenly 25% higher" is puzzling to say the least. Imagine what an automotive mechanic would do first. Obviously, verify the complaint, like you're doing now. In 50% of situations it doesn't verify. The cause can vary, from wife 'forgetting" she did an extra long trip to check on "a sick relative" to extra weights carried, underinflated tyres or driving with the hand brake partially on, and so on, and so on... For the rest of situations a mechanic has to dig a lot deeper to check a long list, much longer than mine in my previous post. I don't want to be true but my intuition tells me the complaint will not verify.