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 to contact the service center or, according to the main signs, fix the problem 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 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, it is necessary to use a special candle key, 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.
- Incorrect 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 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 on long trips it is always better to have a working duplicate with you in order to be able to start the car.
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In the article, we will consider possible malfunctions that may occur during the operation of a Renault / Dacia Sandero car.
The engine will not start
Starting an engine with a fuel injection system is the same at any ambient air and liquid temperatures in the engine cooling system.
To start the engine, you only need to turn on the starter without pressing the gas pedal, and the system itself will adjust to the required parameters of fuel supply and ignition timing.
If the engine does not start after three attempts, then:
Open the hood by pulling the drive handle towards you
Measuring the oil level with a dipstick
On a K4M engine, the oil level must be between the top and bottom of the shaded area.
In the K7J and K7M engine - between the lower and upper marks on the dipstick
Checking the coolant level
It should be between the MIN and MAX marks on the expansion tank.
We examine the engine. We pay attention to the drips of gasoline, oil and coolant.
We check the integrity of the wiring.
We check the fit of the wiring harness pads in the connectors of the ignition coils.
After inspecting the engine and systems, we try to start the engine again.
If the engine does not start on the first attempt, then we press the gas pedal all the way and turn on the starter for two to three seconds.
In this mode, the cylinders are purged, fuel is not supplied through the injectors, and voltage is not applied to the spark plugs.
After purging the cylinders, we try to start the engine in normal mode without pressing the gas pedal.
If the engine still does not start, then:
The power system does not work;
The ignition system does not work;
Start system not working.
Startup faults
The starter does not turn on.
The reason may be a violation of contacts and connections.
Open or short circuit in the starter switching circuits, malfunction of the traction relay.
If clicks are heard when the starter is turned on, then the cause is a discharged battery, oxidized or weak contacts on the battery or starter.
Also, the cause may be a malfunction of the holding winding of the traction relay.
If the starter turns on, but the armature either does not rotate or rotates slowly.
The reason is that the battery is discharged, the contact connections are broken, the contacts of the traction relay are burnt, the collector is dirty or the brushes are worn out, an interturn or short circuit in the starter windings.
If the starter is engaged, its armature rotates, but the flywheel is stationary.
The cause may be a loosening of the starter to the clutch housing, damage to the teeth of the flywheel or drive gear, slipping of the freewheel of the drive, breakage of the lever, driver ring or buffer spring of the starter drive.
If the starter does not turn off after starting the engine.
The reason is a malfunction of the starter freewheel, sintering of the contacts of the traction relay. If such a malfunction occurs, you must immediately stop the engine.
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
A weak battery charge 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 turn the crankshaft. There is no simple solution here, the motor will have to be repaired or replaced with a serviceable one, but first, in any case, a thorough diagnosis will be required.
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 power to the 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.
Fuel injector failure
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 damaged catalyst clogs the 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 an internal combustion engine is its ability to maintain the operating pressure in the combustion chamber. The parameter is measured with a special device. The presence of problems with compression is indicated by unstable idle, increased consumption of gasoline and oil, and 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.
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asks: Mozart Valery.
Essence of the question: Renault Logan starts when cold, but Renault Logan does not start when hot.
I bought Logan from the 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 of the dealership, 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:
- We start "on a cold", warm up the engine;
- It is necessary to achieve that the engine 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. 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
