Renault Sandero intermittently won't start. Why won't it start? Fuel pipe damage

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asks: Mozart Valery.
Essence of the question: Renault Logan starts when cold, but Renault Logan does not start when hot.

Bought Logan from former owner, a car from "phase 1". The mileage is small, but recently a defect has appeared: when starting “cold”, everything works, but when starting “hot start”, the engine 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 right up?

Main reasons

There can be only 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 dealer center, so I know the device of the car "from and to". You can always turn to me for advice.

So, let's simulate the problem situation:

  1. We start "on a cold", warm up the engine;
  2. It is necessary to achieve that the engine 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. Let's try to start right away.

Conclusions: if at “step 3” the engine started up again, then the reason is in a faulty sensor. Further comments are unnecessary.

Another possible reason

Connector that causes problems

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

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

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

  • Frozen or discharged battery;
  • Water got into the tank;
  • The fuel pump is faulty;
  • Etc.

But there is another reason that is unique to the Logan family.

ECU program defect 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 everyone responded to Renault's request.

The only "letter of happiness" from Renault

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

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

The situation when the car refuses to start or immediately stalls after starting is one of the most unpleasant surprises in the life of a car owner. What can be the cause of such problems in Renault Sandero Stepway and how to fix it, we will tell in our today's article.

Starter does not work

Break in the power circuit. The cause of a power failure may be poor contact at the battery terminals or damage to the wiring from the starter to the control unit. Tightening the terminals and replacing damaged wiring will completely fix the problem.

Lack of battery voltage

Weak charge battery can be easily identified by the fading instrument lighting during an attempt to start the engine. If the battery is completely discharged, the devices will not light up at all. In this case, it is enough to change the battery, charge the old one from another car or connect it to a special charger. In stores, you can also find portable launchers that will come to the rescue away from home.

Electricity to the starter may not be supplied even after one of the fuses has blown. They are very inexpensive, but they can burn out due to a short circuit in the circuit. If the new fuse fails again, you should contact a professional auto electrician.

Starter malfunction

If everything is in order with the power supply of the starter, but it does not respond to turning the key, the reason may be in the breakdown of the mechanism itself. Needs cleaning, repair or replacement.

Engine mechanical failure

This is perhaps the most negative scenario. The starter in this case does not work simply because it is not able to crank crankshaft. A simple solution not here, the motor will have to be repaired or replaced with a serviceable one, but first, in any case, you will need to make a thorough diagnosis.

No fuel coming in

No matter how trite it may sound, but first of all it is worth checking if the gas tank has run out. The fuel level sensor may well break down and display false information on the instrument panel. However, this is a rather rare case.

No food at fuel pump

As with the starter, the appropriate fuse and wiring will need to be checked.

Fuel pump malfunction

The Sandero Stepway gas pump can fail for various reasons. For example, due to the low quality of gasoline or overheating when working in an empty tank. The problem is solved by replacing the pump motor, or the entire assembly.

Fuel pipe damage

When driving off-road or simply on poor pavement with stones, there is a risk of damaging the fuel line. Gasoline in this case will flow to the ground and will not reach the engine. Repairing the damaged area will return the machine to service.

Refusal fuel injectors

Since it is unlikely that all injectors will fail at the same time, the problem is most likely in the engine control unit. It will need to be replaced or repaired.

Spark plug

Candles may produce insufficient spark to start, the issue can be removed by cleaning the candles or replacing them.

Ignition coil failure

In addition to the failure of the module itself, the reason is often hidden in poor contact at the connector. The solution is to clean the contacts or replace the coil.

Problem with sensors

Numerous sensors that send information to the engine control unit sometimes do not work correctly. Here you need a competent specialist with special equipment for diagnostics.

Other Common Causes

Exhaust pipe clogged. If the destroyed catalyst will clog exhaust pipe, the exhaust gases will have nowhere to go and the car will not start. In such a situation, the catalyst is removed from the exhaust system and either the engine is reconfigured to work without it, or a new one is installed.

Compression failure. Compression in the engine internal combustion is its ability to maintain operating pressure in the combustion chamber. The parameter is measured with a special device. The presence of problems with compression is indicated by unstable idling, increased consumption of gasoline and oil, blue exhaust smoke.

Problems with the immobilizer. A dead battery in the ignition key will not allow you to start the engine, as well as a chip inside the key. You can use a spare key to check the version.

There are many answers to one of the most popular questions on automotive Internet forums. Of course, without being able to diagnose or at least visually inspect the car, it is often impossible to get to the bottom of the problem and identify its cause. However, malfunctions due to which Renault may not start can be divided into several categories depending on the “symptoms”:

    Starter not spinning

    The battery does not supply enough voltage

Usually this can be understood by the instrument panel fading during an attempt to start, or when there is no power to all car devices at all. Solved by replacing or charging the battery;

    Break in the starter power circuit

There are times when the wiring from the control unit to the starter is damaged, or there is poor contact at the terminals of the starter solenoid relay. To solve the problem, wiring repair or cleaning / tightening of the terminals is required;

    Faulty starter

After making sure that the starter power is normal, you can come to the conclusion that the starter itself is broken. In this case, repair or bulkhead (cleaning / lubrication) of the starter is required;

It is possible that power is not being supplied to the starter. This can be due to either a blown fuse, or a serious breakdown. electronic system car. If the fuse has nothing to do with it, it is better to contact a qualified service;

    Jammed engine

The saddest of options when the starter does not turn simply because it cannot turn the crankshaft for a reason mechanical failure engine. Usually resolved overhaul or replacement of the engine (or cylinder head);

    No fuel coming in:

    The fuel in the tank has run out

If the fuel level sensor fails, it can mislead the driver, showing a sufficient level of fuel when it actually is not.

Solved by refueling;

    Fuel line damaged

Happens especially after driving off-road. The fuel pipe may be torn or broken. In this case, the fuel flows out, not reaching the injectors. Solved by replacing or repairing the damaged part;

    Fuel injectors not working(for petrol engines)

Usually due to the lack of power to the injectors from the control unit, since it is almost impossible for all fuel injectors to fail at the same time. May require repair or replacement of the engine control unit (“brains”);

    No power to the fuel pump(for petrol engines)

As in the case of a lack of power to the starter, it can be solved by replacing the fuse. Otherwise, qualified diagnostics with a scanner is required;

    Fuel pump defective(for petrol engines)

Very often, a fuel pump malfunction is the result of low-quality fuel (mixed with water, resin, etc.). It is solved by replacing the pump assembly or the motor (turbine) separately;

    No spark:

    The ignition module (coil) does not work

Sometimes it is due to poor contact at the ignition module connector or its breakdown. May require module replacement;

    Spark plugs need to be replaced (cleaned)

Worn spark plugs often produce insufficient spark, which can prevent the engine from starting. In this case, the candles must be replaced;

    Malfunction of one of the sensors responsible for the correct operation of the engine or the engine control unit

Electrical sensors that transmit parameters to the engine control unit can directly affect the start of the car, namely, block the spark or fuel supply when trying to start. The problem requires competent diagnostics by the scanner;

    Violations in the intake or exhaust systems of the engine:

    Problems with the intake tract

Due to worn gaskets intake manifold or throttle, as well as general contamination of such components as: throttle valve, regulator idle move, gas recirculation valve, etc. - Starting the engine may be difficult or impossible. It is solved by cleaning the listed parts and replacing the necessary gaskets with new ones, after which it may be necessary to reset the adaptive settings of the ECU with a scanner;

    Clogged catalytic converter

If the catalyst has collapsed and clogged the exhaust pipe, the engine may not start, because. exhaust gases will have nowhere to go. In this case, the catalyst is removed from exhaust system and, either they change it to a new one (which is very expensive), or they reflash the engine control unit to work without a catalyst;

Good evening. Renault Sandrera 2010 suddenly stopped starting. Mileage 56 thousand. The problem happened when the wife went to pick up the children from the dacha in the Yaroslavl region. From Moscow to the dacha, the wife drove normally. Travel time was 7 hours. The next day, the wife was going to go back to Moscow, but the car would not start. Put in another battery and it started. After the battery was removed from the running car, it died. We borrowed a battery from a neighbor and went to Moscow. Travel time was 4 hours. The car has arrived. The question is what could be wrong? Old battery? Generator? Can the battery be removed while the engine is running?

1 answer

    good afternoon.
    it is highly undesirable to remove the battery on a running car (with the exception of cars where there is no electronics such as old Muscovites for a penny), there are jumps in the electrical system and some kind of sensor may burn out, it is best to light it with wires.
    If I understand correctly, it won’t start, it turns the starter badly or doesn’t turn at all.
    Cause the car wouldn't start, the battery was dead.
    and that's why he sat down for two reasons, either the battery became unusable or it was not charging.
    When the car is driving, the warning light is on "acb" on the tidy, signaling that there is no charge?
    first of all, with the battery installed on the car, measure the voltage at the terminals, it should be in the region of 12.5 - 12.8 volts, then start the car and also measure the voltage at the terminals should become more than about 13.8-14.5 volts, (turn on the gas voltage should increase slightly) this indicates that the generator is working. also turn on as much as possible all electrical consumers at the terminals, the voltage should be at least 12.8 volts.
    If the alternator is working then the battery is to blame.

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 causes a lot of breakdowns. For example, after a while, Renault Logan may not start well. In this case, you can try contacting service center or, according to the main signs, independently eliminate the malfunction.

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 related to the fact that Renault Logan is hard 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:

  • Fuel Regulator Malfunction
  • Candles do not produce a spark, the problem with the coils
  • Incorrect installation of timing marks, desynchronization of the ignition phases
  • Failure of the throttle, which is responsible for the supply of air mixture
  • Immobilizer failure, loss of communication with the chip
  • Clogged fuel injectors, deterioration in the quality of fuel atomization
  • Fuel filter clogged

Diagnostics

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

  • If the pressure regulator fails, then you must immediately change this component to a new one. To do this, first disconnect the fuel return hose, then turn on the ignition. If fuel begins to flow from the hose, this will indicate a failure of the regulator. If this problem occurred while driving, on the highway, then you need to pinch the tube or muffle it with something so that you can get to the nearest service station
  • When the spark disappears, 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 examine the electrodes and tips of high-voltage wires. If there are traces of soot, then most likely they are faulty. For a quick check, you can ask an 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 a candle to a high-voltage wire and follow the appearance of a spark. If it is absent, then you can get to the place of repair, but you should carry out an accurate diagnosis of the unit and replace it 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 marks of the phases of the gas distribution mechanism 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 phases if a breakdown occurred on the road, this should only be done by specialists at the service station.
  • Wrong setting throttle valve or its 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 housing and traces of wear.
  • If Renault Logan does not start or stalls immediately after starting, then you need to look at the indication of the immobilizer lamp, which is located on the instrument panel. The reason may be the loss of communication with the chip. In this case, it may be necessary to reprogram the key, so it is always better to have a working duplicate with you on long trips in order to be able to start the car.

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