Nix2

That's all I think about this topic - I created a separate topic (for the sake of order) regarding strictly "Idle speed of Fabia 1.0 TSI"

Hello. My Fabia 1.0TSI/95KM (2019) probably has an increased idle speed because the VCDS shows approx. 945-955rpm (regardless of the engine temperature), and at the same time the tachometer on the dashboard randomly shows approx. 1000 or approx. 950rpm once. (the readings differ by approximately 1-2mm on the scale, so the difference is approximately 50-100r, but there is a difference) The photos were taken from a tripod, from exactly the same angle, so there is no question of the camera's "point of view". All power consumers are turned off, the engine is warmed up. So the imprecise tachometer readings on the dashboard are a separate issue, and the VCDS displaying a value of 945-955rpm, which seems too high for this engine, is a separate issue... I have connected the VCDS dozens of times and it is always 945-955rpm. Maybe your colleagues have a screenshot of VCDS, what does it look like? Regards

I also drive a 2019 Corolla 1.2T every day (similar turbo engine with direct injection, 1.2L/116 HP, but with 4 cylinders). The Corolla does not offer such surprises as the Fabia. When you let off the gas, it slows down obediently. And the WLTP and WLTP regimes must also meet...

In my Fabia, Skoda engineers were extremely stupid when it came to the "Anti-Stall" aspect. Fabia happily displays the green ECO leaf, and at the same time FORCES the driver (driving ECO) to press the brake pedal ADDITIONALLY at every third intersection... this is ECO, wear of brake pads, gasoline and the environment... And what happens when you go down long hills (in the mountains) and use engine braking? It's possible, but initially when you brake the engine to a speed of about 1200 rpm, fuel consumption is ZERO. When we exceed (down) the speed of 1200 rpm, the fuel consumption of a rolling car is... - about 2.0L/100km... Wonderful ecology

I tested the car for 2 weeks and measured various parameters via VCDS. Yesterday I drove a similar Skoda Rapid (2018, 120,000 km, in perfect condition, no errors, drives quite ok and according to the owner everything is ok) and... I discovered that the car behaves EXACTLY like mine. Conclusion - this is how it should be! This Rapid "pulls" at idle speed... A separate issue is the imprecise tachometer readings on the dashboard. I noticed that there are random readings from about 1000rpm to about 1200rpm, and the VCDS scanner constantly shows about 945-955rpm. I will come back to the issue that the car drives itself, without pressing the gas pedal - I think this is an algorithm that prevents the engine from stalling (throttling) and that is why the controller strives to maintain such (increased) revs. (this suggestion appeared earlier in this thread). I think that if someone drives dynamically (i.e. uses little engine braking), he or she will not notice that the car wants to move without pressing the gas pedal. However, if someone drives "eco" and sometimes allows the revs to drop to the magic limit of about 1000 rpm, they will immediately notice this phenomenon... Regards

Yes, that's right, each car has its own (sometimes intelligent and sometimes not) charging algorithm, but what can be said for sure: there cannot be a voltage of 12V on terminal "30", because this means NO charging (and if there is no charging, the voltage will quickly drop to below 12V), then the voltage of the battery itself... of course we are talking about a running engine. I also cleaned the OBD socket as a preventive measure As for the revolutions - in all conditions, at all engine temperatures, the idle revolutions stabilize and amount to approximately 950 rpm (and this is also what the tachometer on the dashboard shows)

I did a second longer ride, the voltage of terminal 30 ranged from approximately 12.2V to 14.4V and it changed literally every second, randomly. Then I checked and cleaned the battery terminals, the battery ground to the body, and the entire fuse box and fuses directly next to the battery. (I wanted to check the ground on the engine, but I don't see such a ground cable anywhere) There is some result - but not entirely, now VCDS shows the voltage at idle and on the road in the range from approx. 13.5V to 14.4V (it changes randomly) Now there are no indications of 12.7V, the minimum is 13.5V, the same voltage as the VCDS indications is on the battery terminals. However, the revs were still higher (VCDS indicates approx. 950 rpm on a warm engine). Are these unstable charging the right lead in this case? Or maybe it is "suspicious" because it is 5 years old (i.e. from new) and the car has start/stop...

Yes, The voltage measured with a multimeter (a good quality one, Fluke, and in the "LowZ" mode, i.e. with some load) directly on the battery terminals at any engine speed is about 14.4V, and according to the diagram from Skoda Rapid (I can't find the diagram for Fabia III but I think it's the same) the main bus "30" is connected directly to the battery positive. On this bus, the ECU (via VCDS) measures and gives a voltage of 12.7-13.7 V... so something is wrong. Tomorrow I check all battery and ground connections.

Yes it's true. Today I connected VCDS (the engine has the UDS protocol) and what surprised me was the voltage of terminal 30 was very very low, from 12.7 to 13.7V! This is the main PLUS and should have the same voltage as at the battery poles (which I measured earlier and which is approximately 14.4V at idle? Perhaps this is the reason for the higher idle speed - "undercharged: battery?" This is what it looks like.

In the Fabia III, the pedal is "electronic" - there is no cable, so it should not "jam". I can do a test drive with the driver and read/record individual measurement blocks on VCDS, such as "accelerator pedal deflection", "throttle opening", etc., but which parameters should I pay attention to? It seems to me that these revolutions are forced by one of the temperature sensors... perhaps, for example, the intake air temperature sensor? (and the outdoor temperature sensor readings seem ok)

@Rooted Yes, regardless of the distance traveled, the idle speed is too high and the temperature on the display is always 90 degrees C.

The revolutions are increased regardless of the engine temperature, additional load, lights, air conditioning, turning the steering wheel or with a greater electrical load, e.g. air conditioning on, turning the steering wheel and others. The Start/Stop system always works when it should, with no messages or warning lights appearing. I also checked the battery charge - the battery terminals show approximately 12.3-12.4V a few hours after the last car ride, and immediately after starting the engine it is 14.4V (proper charging). The engine (apart from idle speed) runs well, consumes little, has good dynamics and warms up quickly (after approx. 2.8 km of running at a temperature of approx. 13 degrees C, it already reads 90 degrees C). There are no errors either in the engine or in other modules. I have a VCDS interface and I checked the "throttle body adaptation" twice - in this engine model, this procedure takes literally only 2 seconds and a message about the successful procedure is displayed. However, this does not change anything, the revolutions are still at 1000-1200 (they randomly drop to either 1000 or 1200 rpm) - I also noticed minor irregularities in these idle revolutions - e.g. when pressing/releasing the clutch.

I haven't been on the thread for a long time, but during these 3 months someone else was driving a Fabia and noticed something that probably changes the matter... Well, now what is definitely happening is that the idle speed simply NEVER goes down to the factory setting (approx. 800 rpm) and they stay at the level of 1000-1200rpm, which is why the car "accelerates itself"... I wrote earlier that the idle speed drops to the factory value, but this is not the case (I was wrong in previous posts). The idle speed is too high and it always happens, regardless of the engine temperature (which heats up quickly). Where to look for the cause in such a case? Regards

I accidentally misled you - it's not about switching to eco mode (this Fabia doesn't have any driving modes) but about eco-driving itself, because that's when this condition becomes particularly noticeable.

Yes, but it's annoying, because when driving in eco mode (lots of engine braking), you have to use the brake...