Renault Logan is a modern car that practically does not give its owner any inconvenience and problems in operation. However, even such a reliable car can sometimes 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.

The 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. With 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 the synchronous operation of the ignition phases of the fuel mixture in the cylinders is disrupted. 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 malfunction. It is necessary to regulate the amount of air that is supplied to the 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 of feedback between the immobilizer unit and the 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. A clogged or dusty fuel filter can often be the cause of this serious problem.

• 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 rear seat area. There should be a short, characteristic buzzing.

If during such diagnostics 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 peep test. 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 this unit, 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 is necessary first visually, and then using special equipment to check the spark plugs for serviceability. If they are working properly, 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, then 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 supply hose. Then turn on the ignition. If the fuel is supplied at low pressure, it means that 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 one 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 be aware of this point, if suddenly the 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 of ​​a dealership, so I know the car's structure "inside and out." You can always ask me for advice.

So, we will simulate a problematic situation:

1. We start up "cold", warm up the engine;
2. It is necessary to ensure that the motor stops starting. There is no need to wait 5 minutes;
3. 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 engine 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 in the ECU program on an 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

The situation when the starter actively spins the crankshaft, but the Renault Logan engine does not start, can discourage even the most optimistic driver. Sometimes the search for the cause of the malfunction takes more than one hour and takes a lot of energy and nerves. To reduce this time, you need to navigate typical breakdowns and know the algorithm for finding them. Today we will talk about what may be the reasons why the 8-valve 1.6 and 1.4 engines of Renault Logan, Largus, Sandero do not start.

The main reasons and how to eliminate them

Cause 1. The idle speed adjustment is broken

In some cases, a violation of the idle speed control leads to the fact that when the engine is started, the fuel mixture does not enter the cylinders. It is quite simple to diagnose an electronic malfunction. If the problem is in this unit, then it is enough to press the accelerator pedal and open the throttle valve - the engine will start immediately. The solution to the problem is to clean the idle speed controller.

Cause 2. Faulty crankshaft position sensor (DPKV)

(DPKV) sends pulses to the electronic engine control unit (ECU). In the future, the microprocessor interprets them into signals that control the power supply systems, ignition, etc. Therefore, a breakdown of the crankshaft sensor can be detected not only by direct replacement, but also by indirect signs associated with a lack of voltage at the key nodes of the internal combustion engine.

How to check the crankshaft position sensor

In order to check the serviceability of the crankshaft sensor, we check for a spark. To do this, remove from any cylinder with a tip and attach it to a known working candle. Its body is connected to the "mass" of the car, after which the crankshaft is scrolled with a starter. The absence of a spark is not direct evidence of a breakdown of the DPKV - in addition, you should check whether the fuel pump is receiving power.

Checking the power supply to the fuel pump

To access the fuel pump, move the rear seat of Renault Logan and lift the fuel filler flap - it is held by plastic latches that can be easily squeezed out with a screwdriver or other flat object. Next, remove the block from the fuel pump connector and connect a 12-volt test light to its black and brown wire (the other two are responsible for the fuel level sensor readings).

It is not recommended to measure voltage with a multi-ammeter due to the fact that its readings will not allow judging the current strength and power consumption. After turning on the ignition, the control lamp should light up for just a few seconds. This will give you confidence that the fuel pump is powered and that it regularly supplies fuel to the fuel rail.

If after the light does not light up (further fuel supply is not carried out), then, in combination with the absence of a spark, this fact is direct evidence of a DPKV breakdown, which is the reason why the 8-valve Renault Logan, Sandero, Largus engine does not start.

Cause 3. Malfunction of the fuel pump

Among the reasons why the fuel mixture does not enter the cylinders, in the first place are the malfunctions associated with the fuel pump. Next, we will tell you how to diagnose the performance of the fuel pump itself and check the health of the electrical part.

The fuel pump is out of order

After gaining access to the top of the fuel pump, clean all dust surfaces with a brush or compressed air. Remove the fuel inlet fitting (in the photo it is indicated by an arrow) and take it along with the hose to the side.

It is very easy to check if the pump is pumping fuel. To do this, a thin tube is connected to the pump outlet, the other end of which is lowered into a small container. It is enough to turn the ignition key for a few seconds and turn the engine with a starter to make sure that fuel is flowing into the line. And, nevertheless, even if this does not happen, do not make hasty conclusions - perhaps the pump is not supplied with 12 V. How to check the electrical part has already been mentioned above. If everything is in order with the power supply, then you can safely change the pump turbine - with a high degree of probability, the cause of the breakdown lies in it.

There is no power at the fuel pump connector

If, as a result of checking the fuel pump, it was found that no power is supplied to its connector, then first of all we check the fuse. The fusible element is located on the left side (in the direction of the car) of the engine compartment, in the safety block. In the fuel pump supply circuit for 8-valve engines of volume 1.4 and 1.6 Renault Logan, Largus, Sandero and other similar cars, a fusible element is used, designed for a current of 25 A - its location in the block is indicated by an arrow in the photo.

A blown fuse by 99% indicates problems with the fuel pump, although the possibility of a short circuit of its positive wire to ground cannot be ruled out. It is not difficult to check the latter - it is enough, with the connector removed from the pump, to insert a working fuse into the block. If at the same time the control lamp comes on, then you can start dismantling and replacing the pump. Otherwise, you should ring the wires of its power supply and eliminate the short circuit.

If, when examining the fuse, it was found that it remained intact, then you should check whether a "plus" comes to its contacts from the on-board network of the car. In addition, check the operation of the relay, which is responsible for switching the power supply of the fuel pump.

To do this, the device circled in the top photo is removed from the block, and a jumper is installed in its place. The latter are closed by the connectors corresponding to the power contacts of the switching element. The appearance of power at the pump terminals indicates the serviceability of the circuit. Otherwise, it is necessary to make sure that the switching element itself is operational and that there is a control signal on its contacts.

To find out if the control voltage is supplied to the relay, check for the presence of a constant "plus" at the corresponding terminal in the fuse box block and diagnose whether the control "minus" comes to the block.

Keep in mind that "-12V" appears on the input contact of the relay only when the engine is running, so you should not only turn on the ignition, but also crank the engine with the starter. If the lamp connected to the control "minus" and the positive terminal does not light up, then the cause may be either a broken wire to the control unit, or problems with the ECU itself, the immobilizer, etc.

Something else useful for you:

Wiring problems

The situation when voltage does not appear on the fuel pump even when the power terminals in the relay block are bridged occurs quite often. Of course, the only thing that can be assumed in this case is a wire break on the way from the engine compartment to the fuel tank. However, not everything is so simple. The fact is that the developers of Logan or Sandero have a weak link in the design in the form of a connector, which is located under the interior carpet right at the left pillar.

In a dry environment, all its contacts are in good condition, so there are no wiring problems. However, the location of the connection was chosen so poorly that over time, moisture (and it somehow penetrates into the interior) does its dirty work and the contacts oxidize. Of course, in this case, the performance of individual components (including the fuel pump) cannot be guaranteed, which leads to the failure of the power unit to start.

To gain access to the ill-fated connector, you need to remove the trim of the left side post and raise the carpet. After that, you should disconnect the block and check for the presence of voltage at the lowermost terminal, which is indicated by the arrow in the photo - it is responsible for the positive wire.

If there is a signal, then it is enough to clean the contacts so that the fuel pump power is restored. If this does not happen, then you should look for an open circuit on the side of the tank. In the case when the voltage does not even reach the connector, it is necessary to ring the circuit to the safety block and eliminate the open in this section.

As you can see, there are many reasons why the Renault Logan engine refuses to start. Of course, we cannot take into account all possible factors and mention every malfunction, however, if you act according to the scheme proposed above, then with a great degree of probability you will be able to start your Logan or Sandero.

A three-part video that explains in detail and shows why the 8 valve engine does not start on Renault Logan, Sandero or Lada Largus.

Seal

In pursuit of efficiency and environmental performance of motors, engineers annually make a lot of efforts to improve these units. This need is due to an increase in the number of malfunctions caused by unstable operation or unauthorized stopping of a running engine. Renault Logan owners are well aware of the problem of difficult starting. If the unit has stalled, then the first thought that came to you is to go straight to the service. Often the most common problem is when the engine of a car does not start on a cold one, many car owners immediately have a question, what are the reasons?

Here we will consider the most common failures in engine operation on Renault Logan and provide methods for eliminating them. And most importantly, you need to understand the reasons why the engine does not start, especially on a cold one.

What are the most common faults?

If the Renault Logan engine is difficult to start, does not start or constantly stalls, then the following may be among the main reasons for this breakdown:

• the fuel pressure regulator is out of order;
• poor spark production due to malfunctions of candles or coils;
• incorrect installation of gas distribution marks, which causes the lack of synchronous operation of the fuel ignition phases;
• irregularities in the operation of the throttle valve, which regulates the volume of air supplied to the intake manifold;
• possible failure of the immobilizer due to frequent cases of loss of feedback with the key chip by the control unit;
• if the engine tends to stall on the move, check the injectors for the quality of the fuel spray;
• another reason for stopping the engine may be a dirty fuel filter;
• poor start-up of the unit or its shutdown immediately after start-up indicates ineffective operation or failure of the gas pump;
• if the engine starts, but after a while it stops functioning, then a faulty crankshaft sensor may be the culprit;
• also, a worn camshaft or its sensor can provoke the engine to an unstable start and unstable operation.

Now let's start analyzing the reasons for the unstable operation of the engine and try to diagnose the malfunctions with our own hands.

Diagnostic features

1. When the pressure regulator malfunctions, it must be replaced. To confirm its faulty state, disconnect the fuel return hose and then turn on the ignition. If pressurized fuel immediately begins to flow from this hose, then this is direct evidence of a malfunction of the regulator. To eliminate breakage on the road, you should plug its edge or pinch the tube, which will reduce the section. After completing these manipulations, you can guaranteed to get to the repair station.
2. If there is no full spark, then this causes interruptions in the operation of the motor. To exclude this aspect from suspicion, you must use a special candle key. Having unscrewed the candles, we connect them to the lugs of the high-voltage cables for the ignition distribution and turn the starter a few turns. If the spark discharge is insufficient, the assembly must be replaced. With such a malfunction, the car is able to arrive at the place of repair without outside help.

1. Attention! When performing work of this nature, compliance with the requirements of safety rules is a prerequisite for execution! High voltage is very harmful to health!
2. Incorrect installation of marks on the valve timing provokes the engine to significant interruptions in speed. The fact is accompanied by specific claps. The malfunction cannot be eliminated without resorting to the use of specialized equipment. If a breakdown is caught on the road, then personal attempts to eliminate it are contraindicated. It is recommended to tow the car to the service, where it will be provided with qualified technical assistance.
3. In case of incorrect operation of the damper that regulates the air flow, the breakdown is diagnosed in several ways. After checking, you should start troubleshooting. To do this, unscrew the air supply pipe and inspect the inner surface of the body and the damper itself for damage, as well as workings on the walls.
4. On a stationary motor, it is in the closed position. If the impossibility of complete closure is noticed, then the node needs to be cleaned. After that, the damper will have to be computerized. In practice, it has been confirmed that the occurrence of a malfunction is of an increasing nature. Its sudden appearance on the way is impossible. It is recommended to carry out the corresponding list of repair measures in a specialized workshop and in advance, at the first symptoms of a deviation in work.
5. When, after starting and short-term operation, the engine immediately stalls, pay attention to the behavior of the immobilizer lamp located on the dashboard. When it blinks, the specified node can be counted among the causes of the malfunction. This usually happens due to the loss of electrical communication with the chip located in the key by the immobilizer unit. It will be possible to resume movement only after changing the faulty key to a spare analogue.
   Special equipment available in the arsenal of specialized services allows you to "register" the key in the software of the unit.
6. Tip: We recommend bringing a spare key with you on long journeys.
7. Checking the performance of the fuel injectors is diagnosed using a special test bench. This procedure should also be entrusted to specialists.

1. When the fuel filter is clogged, it must be replaced. If an unpleasant malfunction occurs on the road, when the engine tends to stall, we recommend using the recommendations below to eliminate the defect.
2. We open the hood of Renault Logan and dismantle the fuel supply hose, after which we turn on the ignition. If the flow of fuel is carried out at low pressure, then the filter began to show insufficient flow capacity.
3. To increase this ability, we dismantle the filter element and blow it in the direction opposite to the normal fuel supply mode. You should also clean the filter as much as possible. To do this, we use a screwdriver or a suitable thin object necessary to influence the paper insert.

1. Install the filter in its original place and start the Renault Logan engine. If the unit does not stall, and its speed does not "float" or "jump", we go to the nearest service to replace the unusable element.
2. If the engine suddenly stops, we check the operation of the fuel pump. To this end, we open the hood and remove the fuel supply hose. At the same moment, turn the key to position "2", which initiates the activation of the pump relay.
   When the flow of gasoline is not detected, then the pump is faulty. In this case, it is not possible to issue specific recommendations for the temporary elimination of the malfunction. The only measure is to tow the Renault Logan car to the nearest workshop.
3. If the failure of the crankshaft sensor turned out to be the cause of the malfunction, then the elimination of this breakdown on the road in the absence of special equipment is also impossible.
4. It happens that the engine does not start at all, especially on a cold one, in this case, it is advisable to contact a specialist in a service center.
   In this case, repair measures in a Renault Logan car are carried out only under the conditions of a specialized service.
5. Diagnostics and repair work due to wear of the camshaft or its Renault Logan sensor, when the engine does not start, are performed in a service based on engine repair.

In custody

In the article, we have given a short list of malfunctions that occur with Renault Logan engines. This material is recommended to be used in the form of instructions that allow you to determine the indicated breakdowns. We hope our article is useful.

Recently, more and more requirements for environmental friendliness and safety have been imposed on cars. As a result, the number of installed sensors and units increases. Over time, this becomes the cause of a large number of breakdowns. For example, after a while Renault Logan may not start well. In this case, you can try to contact the service center or, according to the main signs, eliminate the malfunction yourself.

We will try to take a closer look at common problems and the main ways to fix them in this article. Almost all of them are associated with the fact that Renault Logan is bad to start on a cold one.

If the Renault Logan engine does not start, the starter turns but the car constantly stalls, then there are several main causes of malfunctions:

• Malfunctioning fuel regulator
• Candles do not spark, coil problem
• Incorrect installation of timing marks, desynchronization of the ignition phases
• Failure of the throttle, which is responsible for supplying the air mixture
• Failure of the immobilizer, loss of communication with the chip
• Clogged fuel injectors, poor atomization of fuel
• Dirty fuel filter

Diagnostics

To fix the problem, you first need to determine exactly at what level of the system the failure occurred. This requires component diagnostics, during which some peculiarities should be taken into account:

• If the pressure regulator is out of order, then you must immediately change this component to a new one. To do this, you must first disconnect the fuel return hose, then turn on the ignition. If fuel starts to flow from the hose, this will indicate a failure of the regulator. If this problem occurs while driving, on the highway, then you need to squeeze the tube or drown it with something so that you can get to the nearest service station
• When the spark fails, it can also cause serious engine interruptions. In this case, you need to use a special candle wrench, with which all the candles are unscrewed. It is necessary to carefully inspect the electrodes and lugs of high-voltage wires. If there are traces of carbon deposits, then most likely they are defective. For a quick check, you can ask the assistant to turn the ignition key for a few seconds so that the starter turns a little, but the engine does not "grab". At this time, it is tedious to connect the candle to the high-voltage wire and watch for the appearance of a spark. If it is absent, then you can get to the place of repair, but an accurate diagnosis of the unit and its replacement should be carried out as soon as possible. It is important to remember that high-voltage wires are very dangerous and should be diagnosed and handled with extreme caution.
• Incorrectly set timing marks of the valve timing lead to the fact that the engine starts to work with severe interruptions and jumps in speed. This will also be accompanied by strong pops from the exhaust manifold. The malfunction can only be eliminated with special equipment. It is not recommended to try to independently adjust the timing of the timing if a breakdown occurs on the road, this should only be done by specialists at the service station.
• Improper throttle setting or contamination can be detected in several ways. The most effective is to disconnect the air pipe and inspect the condition of the damper, search for defects on the walls of the body and traces of wear.
• If Renault Logan does not start or immediately after starting it stalls, then you need to look at the immobilizer lamp indication, which is located on the instrument panel. The reason may be the loss of communication with the chip. In this case, reprogramming of the key may be required, so when traveling on long journeys it is always better to have a working duplicate with you in order to be able to start the car.