When Renault Logan won't start. Renault Logan does not start Reasons and how to fix them Renault Logan engine does not start 1.4 reasons

Renault Logan is modern car, which practically does not give its owner any inconvenience and problems in operation. However, even this reliable car sometimes it can malfunction. Often the owner is faced with the fact that the Renault-Logan will not start. Let's take a look at the main reasons why a car may refuse to start and find out how to troubleshoot these faults. This information will be useful to every owner.

Most common problems

Experts identify several main reasons that can prevent the engine from starting normally. If the car starts up with difficulty, constantly stalls or refuses to start, then the following malfunctions can be distinguished:

If Renault-Logan won't start, don't panic right away. The fuel pressure regulator may be out of order. At insufficient pressure in the fuel rail, the electronic engine control unit simply will not give a start command.

If the timing marks are incorrectly set, the engine will also not start. In this case, Renault-Logan will not start because synchronous work phases of ignition of the fuel mixture in the cylinders. This problem may rarely occur, but it should not be ruled out. In addition, the marks can be displaced due to the fact that the belt has jumped one or more teeth. In this case, a poor timing belt tension can be diagnosed. Experts recommend periodically inspecting the condition of this belt and, if necessary, changing it.

Poor starting or engine will not start due to throttle valve malfunction. It is necessary to regulate the volume of air that is supplied to intake manifold when you press the gas pedal.

Problems with starting are possible due to the failure of the immobilizer system. Owners often complain about the loss feedback immobilizer unit with a chip on the key.

If the car often stalls on the move, experts recommend checking the injectors - perhaps, due to various reasons, the quality of the fuel spray torch has deteriorated. Oftentimes, a clogged or clogged dusty area can be the cause of such a serious problem. fuel filter.

If the Renault-Logan does not start well or stalls immediately after starting, then this may be due to an insufficiently efficient fuel pump. Also, the pump may fail.

Starter turns, engine won't start

If Renault-Logan does not start, and the starter turns the flywheel, then the first step is to make sure that the fuel pump is working properly. Sometimes the sounds of the fuel pump can be heard in the cabin. Most often, the sound of the node is heard especially well in the area rear seat... There should be a short, characteristic buzzing.

If during such a diagnosis it was possible to find out that the pump does not work, then the first thing to do is to check whether the fuses are intact and whether the relay of the ECU system and the fuel pump relay turn on.

If the fuses are fully functional, then you should make sure that the relay is turned on. If it turns on, a characteristic click will be heard.

Fuel system

If Renault-Logan does not start, the cause may be in the fuel system. If the fuel pump turns on and then functions normally, then the pressure level in the fuel rail of the vehicle is checked. An ordinary pressure gauge is suitable for diagnostics. You can also perform a peephole check. There is a spool at the end of the ramp - it is pressed on with a suitable device. With a normally operating pump, the pressure should be at least 2.8 atm.

When pressing the spool without a pressure gauge, the fuel should flow in an even stream. In this case, the pressure must be constant. If the pump operates normally, but there is no pressure in the rail, then either there is no fuel in the tank, or the fuel filters are clogged, or there is no permeability in the fuel line. The fuel pump itself may be faulty.

Checking the pressure regulator

If there are malfunctions in the pressure regulator, then it must be changed. To diagnose given node, it is enough to disconnect the hose through which the fuel flows back into the tank. When the hose is disconnected, turn on the ignition. If fuel immediately under pressure comes out of the hose, then the regulator is faulty.

To fix this problem on the road, they muffle the edge of the regulator or pinch the tube. After completing these measures, the car will be able to drive to the place of repair.

Ignition system

When it was possible to make sure that there is pressure in the fuel rail, it is recommended to proceed to the diagnosis of the ignition system. Experts advise checking the spark with a special spark gap. If there is a spark, but the Renault-Logan does not start, it stands first visually, and then with the help of special equipment check the candles for serviceability. If they are in good order, then move on.

Throttle valve

If the damper does not work correctly, then this breakdown can be diagnosed in different ways. To eliminate the malfunction, unscrew the supply pipe and visually check the body inside and directly the damper for possible damage or depletion.

If the engine is not running, the damper is always closed. If for some reason it cannot close completely, then the unit must be cleaned with special means. Then it is necessary to carry out the computer adaptation procedure.

Starts up and stalls

Renault Logan starts up and stalls if there is a malfunction in the immobilizer. This can be diagnosed by the corresponding lamp on the dashboard. If it blinks, it means that we can safely talk about node malfunctions. Usually the immobilizer loses communication with the chip on the key.

Fuel filter

A clogged filter can significantly affect engine performance. The motor will refuse to start or start and stall. If the Renault Logan car does not start and there are no other serious reasons for this, then you need to check and replace the filter.

Open the hood and remove the fuel hose. Then turn on the ignition. If the fuel is supplied at low pressure, then the filter capacity has decreased. To increase the throughput, the element is removed and blown in the opposite direction. They also try to clean the filter as much as possible.

After cleaning the element, it is installed in its original place. If the engine is not trying to stall, but its speed is stable, then the fuel filter needs to be changed.

Doesn't get hot

Among the reasons for this behavior of the car, only one possible can be distinguished - this is a malfunction of the DTOZH sensor. The sensor, of course, needs to be changed, but first it is worth diagnosing.

The engine is started cold and warmed up. Further, the internal combustion engine is muffled. If it is no longer possible to start the engine, then DTOZH is turned off under the hood. If after that the car starts up properly, then the reason is a faulty sensor.

If the engine does not start, then under the hood you need to find a connector with the number R212 - experts recommend wiping and cleaning the contacts. Line B8 in this connector is directly connected to the ignition switch. If there is an open circuit in the circuit, the car will turn the starter, "Renault-Logan" will not start at the same time - the start is blocked automatically.

Doesn't start on cold

Here you can highlight all of the above malfunctions and causes. But there is another small breakdown that is inherent only in these car models. This is a minor defect in the ECU firmware on Euro-3 motors. The ECU needs to be reflashed. Sedans manufactured since December 2007 are subject to flashing. Owners should know this moment, if suddenly Renault-Logan does not start on a cold one.

Conclusion

These are all the reasons why the Renault-Logan engine may refuse to start. Knowing this information, the owners will be able to troubleshoot the road and drive to the place of further repairs or parking. But more often than not, the car does not start because there is no fuel in the tank or the candles have worn out and are faulty. Many people forget about this, but you need to start with this.

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Asks: Mozart Valery.
Essence of the question: Renault Logan will not start on a cold one, but Renault Logan will not start on a hot one.

Bought Logan from a former owner, a Phase 1 car. The mileage is small, but recently a defect has appeared: when starting "on cold" everything works, but when starting "hot" the motor does not start. It turns out that you have to wait 5-6 minutes until the engine cools down. The starter turns, but the motor does not pick up. This was not the case before.

Still, why doesn't my Renault Logan start as it should?

Main reasons

There may be one reason for the defect indicated in the question - a faulty DTOZH sensor. This sensor itself will need to be replaced, but one test can be done first.

Coolant temperature sensor

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I own a Renault Megan 2 car, before that there were Citroens and Peugeots. I work in the service area dealership, so I know the device of the car "inside and out". You can always ask me for advice.

So, we will simulate a problematic situation:

We start up "cold", warm up the engine;
It is necessary to ensure that the motor stops starting. There is no need to wait 5 minutes;
If the engine cannot be started, open the hood and turn off the DTOZH sensor. Try to start up immediately.

Conclusions: if at "step 3" the motor starts up again, then the reason is in a faulty sensor. Further comments are superfluous.

Another likely reason

The connector that causes problems

Disconnect the connector with the ignition off. Do not forget to collect everything as it was.

Line B8 in connector R212 is connected to the ignition switch. If it is cut off, the starter will work, but the engine start is blocked.

Consider the reasons when Renault Logan does not start "on cold". They look trite:

The battery is frozen or discharged;
Water has entered the tank;
The fuel pump is faulty;
Etc.

But there is another reason that is specific only to the Logan family.

Defect of the ECU program on the engine with Euro-3

If the engine complies with Euro-3 standards, then the ECU controller may need to be replaced with firmware. At one time, a review was carried out, but not all responded to Renault's request.

The only "letter of happiness" from Renault

Logan sedans, which are subject to recall, were produced from December 2007 exactly before restyling. We are talking about the transition to "phase 2" (to Euro-4 standards).

Renault Logan won't start? We ourselves check the DTOZH sensor - an example in the video

Every year, engineers are trying to improve the design of engines, for the sake of the economy and environmental friendliness of these units. In connection with this, the number of breakdowns associated with unstable, poor operation of the engine, up to its complete stop, is growing. Renault Logan owners have repeatedly faced the problem of poor engine starting, as well as its unstable work... Of course, if your car engine stalls, the first thing you do is go to the station. Maintenance... In this article, we will talk about the most common malfunctions associated with the operation of the Renault Logan ICE, as well as consider methods for their elimination.

Most common malfunctions

If your Logan's engine does not start well or stalls altogether, the following malfunctions may be the culprit:

Defective fuel pressure regulator.
Bad spark due to the failure of the high-voltage part, namely candles, coils and wires.
Incorrect setting of the gas distribution mechanism marks, as a result of which the asynchronous operation of the fuel combustion phases occurs.
Defective throttle valve that regulates the air flow to the engine.
Possible problems with the immobilizer, as a rule, the control unit loses communication with the key chip.
If the engine stalls unexpectedly on the move, you need to check the quality of the spray. fuel injectors.
Another reason that the engine stalls on the move may be a dirty fuel filter.
If the engine does not start well or starts up and immediately stalls, the breakdown may be associated with the gas pump.
If the engine does not start at all or does not start well and after a while stalls at an unexpected moment, the failure of the crankshaft position sensor may be the culprit.
A worn camshaft and camshaft sensor can cause poor starting and subsequent engine operation.

Let's take a look at some of the reasons bad work motor and we will try to diagnose these breakdowns on our own.

Diagnostics

If the fuel pressure regulator is not working properly, it usually needs to be replaced. To make sure of its malfunction, it is necessary to unscrew the fuel return hose, and then turn on the ignition. If gasoline under high pressure comes from this hose, the regulator does not work accordingly. To eliminate the malfunction on the way, it is enough to plug one end of it, or press down the return pipe, thereby reducing its cross section. Having performed such work, you can easily get to the place of repair.
In the event that a spark is not supplied properly to the cylinders, engine interruptions occur. To make sure that this unit is malfunctioning, you must have a special key on hand for unscrewing the candles. Having unscrewed the candles, it is necessary to connect them to the tips of the high-voltage wires and turn them with the starter several times. If the spark goes to the side or its strength is not enough, this unit needs to be replaced. As a rule, a car with such a breakdown can get to the place of repair on its own.

Attention! Observe the safety regulations when carrying out such work. High voltage part the car is very dangerous to life and health.

If the camshaft timing marks are set incorrectly, the engine runs with significant interruptions, with characteristic pops.

This malfunction cannot be eliminated without the proper equipment and tools. If this malfunction befell you on the road, do not try to fix it yourself. Tow the car to the nearest car service and repair it only there.

If the damper that regulates the air flow is faulty, there are several ways to identify this failure, as well as to fix it. Unscrew the air supply pipe and inspect throttle for integrity.

With the engine stopped, its position should be in the closed state. If this does not happen, this unit must be cleaned, and then adapted using computer equipment. As practice shows, this malfunction appears gradually and cannot just arise on the road. Accordingly, such repairs must be done at a specialized service station.

If your Logan's engine starts and immediately stalls after a while, pay attention to dashboard, namely, regarding the glow of the immobilizer indicator lamp. If this control lamp flashes, the immobilizer unit has lost communication with the key chip. You can continue driving only by using another spare key instead of the old one.

With the help of special equipment, the key used can be entered into the program of the immobilizer unit, but this is done on special equipment.

Tip: Carry a spare key with you if you go on a long journey.

It is possible to check the operation of the fuel injectors only at an equipped stand, respectively, such repairs are carried out by specialists.
If the fuel filter in the car is clogged, of course, this element must be replaced. In case this situation befell you on the road and the engine stalls, there are some recommendations for detecting and eliminating this malfunction.

Open the hood, then remove the fuel hose and turn on the ignition. If gasoline is supplied under low pressure, the filter has a correspondingly poor flow capacity.
To increase the capacity of the fuel filter, it must be removed and thoroughly blown back.
Remove the fuel filter from the clips and perform some operations to clean the dirt from its housing. You can use a thin screwdriver to punch through the paper element.
Reinstall the filter, then start the engine, if the engine starts and runs smoothly, follow to the nearest car service, where it will be necessary to replace the filter element.
If suddenly the engine of your car suddenly stalled and does not start, you need to check the performance of the fuel pump.

To identify a malfunction of the fuel pump, it is necessary to open the hood and dismantle the gasoline supply hose. At this moment, it is necessary to turn the key to position 2, thereby close the fuel pump relay.

If gasoline does not flow, the fuel pump does not work well and has become unusable. We cannot give any recommendations for its emergency repair, since this unit is changing in assembly with the body. In such a situation, the car must be towed to the nearest service where repairs will be carried out.

If the problem is related to the operation of the crankshaft position sensor, it is impossible to diagnose and eliminate this malfunction without special equipment.

Repairs should be carried out only in a specialized service.

Diagnostics and repair of problems associated with wear of the camshaft, as well as its sensor, is carried out only in the engine repair service.

Conclusion

Here is a brief overview of Renault Logan malfunctions. If your Renault Logan engine stalls and won't start, use our article as a troubleshooting guide. We hope that our material will be useful to you.