No spark on Priora 16 valve reasons

January 15, 2015 Lada.Online 308 496 380

To start the engine, you need to ensure that a spark appears at a certain moment to ignite the air-fuel mixture in the cylinders. Problems with starting the engine occur if one or more elements of the system malfunction. The table lists possible reasons why the Priora does not start.

The spark disappeared on the 16-valve VAZ-2112 injector: causes and diagnostics

Many car enthusiasts have encountered the loss of spark on the 16-valve VAZ-2112 engine. What is this defect associated with? The first thing that suggests itself is the ignition. But, in this case, not everything is so simple, since the problem may lie deeper than it seems at first glance.

The video describes a situation when you lose a spark on the road and the car does not start:

Oil

Many car owners try to change their oil before winter. But not everyone knows that the oil with the lowest viscosity is best suited for winter. Thick oil will simply harden in winter. In addition, when the engine is cold, it is very difficult for it to drive thick oil through the channels. If the picture is complemented by an old battery, then this aggravates the situation even more. Therefore, you need to try to purchase oil of exactly the viscosity at which the engine can start normally even in cold weather. Typically, a product with a viscosity of 5W30 is purchased. But in any case, you need to look at the manufacturer's recommendations. You should not deviate significantly from the tolerances.

The main reasons for the lack of spark

General view of the engine 10-12 series 16 valves

Not all motorists know the reasons for the loss of spark, much less methods for diagnosing and troubleshooting problems. So, it is worth identifying the main reasons, and then deciphering why exactly they become the cause. Finally, you need to consider ways to eliminate the defect. So, what reasons could cause the spark to disappear:

All the reasons have been found and it is worth moving on to the process of eliminating this malfunction.

Are you giving me a spark? Troubleshooting!

First of all, it’s worth noting that you don’t need to rush to check right away. As practice shows, there is a certain sequence of actions and malfunctions that could lead to loss of spark on a 16-valve engine.

Fuel pump

Fuel pump made by Bosch

Ignition is not the first reason for the ignition failure on a car. Before getting into the electrical part of the car, it’s worth delving into the mechanics, so to speak. Turn on the ignition and listen to see if the gasoline pump is working . If it is silent, then you need to check whether gasoline is entering the cylinders.

It is worth starting the diagnostic procedure by checking the fuses for serviceability. Of course, you can only view the one that is responsible for the fuel pump (in this case, when you turn on the ignition, the pump will not pump), but it is recommended to diagnose everything for integrity. If at least one fails, it must be replaced.

The fuses are located to the left of the steering wheel under the light mode switch

If the previous procedure did not help, then we turn directly to the pump itself. For diagnostics, you will have to remove the entire module, which is located under the rear sofa, and disassemble it.

The pump itself is easy to check - the contacts are closed through the tester. If there are no readings, then the part has “died” and requires replacement. If the pump is “live”, then it is necessary to clean the contact group and check the wiring for breaks.

Spark plug

Location of spark plugs on the engine

The candle becomes the second boundary, which may cause the spark to disappear. We unscrew the elements and carry out visual diagnostics. If everything is clean and beautiful outside, then you need to measure the resistance and check the gap. Of course, you can check the performance of a spark plug on a special spark plug stand, but not everyone has one in their garage. Therefore, we do everything the old fashioned way.

We connect the spark plug to a high-voltage wire, which is connected to 1 cylinder, and with the outer side to the body to obtain ground, and provide an ignition contact.

When performing this operation, you should be extremely careful, since the voltage that enters the spark can be fatal. Thus, we check all the spark plugs for the presence of a spark.

An alternative way to check spark plugs

Checking the spark plug using a piezo element from a conventional lighter

Ignition coil

Repaired ignition coil

The ignition coil can be checked using a multimeter. If it is faulty, it is recommended to replace it, but there are brave souls who repair this unit. Of course, not everything always goes smoothly and often everything ends in one thing - the installation of a new one.

High voltage wires

Checking the high-voltage wire with a multimeter

A breakdown or failure of the wire will immediately become known as the car will start to shake. But, if the explosive wires are located incorrectly in the cylinders, then you will have to place them according to the connection diagram. The missing spark problem should go away.

Gas distribution mechanism

The last place to look for a missing spark is the timing belt. Misaligned valve timing can be a problem. This could happen due to incorrect installation of the deposit disk. It is located on the crankshaft pulley and serves as a reference synchronizer for the sensor. If it is positioned correctly, when 1 cylinder is in the TTM, the sensor is placed between the 19th and 20th teeth. You can eliminate the cause by setting the disk correctly to the marks.

Fuel system

Problems here also very often prevent the car from starting when cold. First of all, you need to check whether there is the necessary pressure directly in the fuel rail. The pressure gauge is connected to the fitting installed on it. When, after turning on the ignition, it does not increase, then most likely the following has failed:

gasoline pump;
relay controlling it;
fuses have blown.

You can simply verify that the unit is working – just listen in the cabin. If the pump starts, a characteristic sound will be heard from the rear seats.

After this, you will have to find out whether the suction pipe in the fuel tank is clogged and whether fuel passes through all the hoses.

Often, poor starting is due to the quality of the gasoline being poured being too low. It may, in particular, contain water or other foreign impurities.

It is important to pay special attention to the following point - if the injectors are working, clicks will be heard. If they are absent, you need to check the voltage in the on-board network and the presence of ground. It should also not be ruled out that the problem lies in the ECU or power relay.

It is worth checking whether the candles are wet. This happens quite often after the power plant has overheated. In this case, they are removed from the nests and examined. Quite often, simply wiping them dry is sufficient.

In the end, I would like to say one thing - in order for the car to continue to work without failures in the future, you only need to regularly care for it, carry out preventive maintenance and promptly prepare it for the winter period.

conclusions

Loss of spark on a 16-valve VAZ-2112 may be a consequence of the failure of several vehicle components at once or each individually. But, if the operations indicated in the article did not help, then you should contact specialists at a car service center who will accurately identify the cause and eliminate it.

It is unlikely that several nodes will fail at once. This has not happened in my practice. Unless, of course, you hit the car properly.

The ignition coil rarely fails because it is initially reliable. But the spark plugs and fuel pump often fail.

Even if the timing phase is off, there should be a spark!

There will be a spark, but not at the right time when the air-fuel mixture arrives.

No spark on Priora 16 valve reasons

Before this I repaired the

I have a very strong feeling that the ECU has burned out.

the substitute will reveal it. but it seems to me that you still need to look where you dug (mass on the cylinder head).

Added after 6 minutes 55 seconds:

I changed the sensor, but now when the ignition is on, the fan spins constantly (even if you remove and put on the sensor chip

when cranking the starter the check does not go out

I have a very strong feeling that the ECU has burned out.

the substitute will reveal it. but it seems to me that you still need to look where you dug (mass on the cylinder head).

Added after 6 minutes 55 seconds:

I changed the sensor, but now when the ignition is on, the fan spins constantly (even if you remove and put on the sensor chip

when cranking the starter the check does not go out

The ECU bracket does not matter for January 5.1 and the like - the mass of the controller is not in the cabin, but on the distributor plug - 2 brown wires. It would be necessary to check when cranking with the starter on the MZ connector “+12V” whether it disappears, if not, then we go towards the DPKV wiring - it breaks inside the insulation in the area of the connector itself, it is replaced with a repair connector, the main thing is that if the controller is January 5.1.x, then do not confuse the polarity, If it's BOSCH, then we stick it in at random. When turning on the fan, to reduce the number of tricks, separate the mass of the fan relay from the main ECU. The DT could have been damaged during installation - using a short head, it’s easier to check with a multimeter - on one of the wires there should be +4.95..5.05V (orange), on the other there should be ground (green). It came across to me that the ground track in the controller burned out and as a result of the signals from the mass air flow sensor (ADC 4.98V), TPS, DT went off scale, but the car started!, having restored the track, everything worked as it should.

Added after 1 minute 25 seconds:

DPKV itself rings - about 500-600 Ohms, then ok.

Added after 4 minutes 12 seconds:

If the car has DC, then 1 of the wires can be connected to the mass of the DPS, DT, MAF (they are combined for some reason) - this, by the way, can be the reason for the car not starting when the SOD fan is running - these masses are combined by crimping and are then connected together with the ground of the fan relay – Apparently unnecessary leads are appearing.

If the Lada Priora's starter does not turn

Burnt starter commutator, stuck brushes or severe wear

Open or short circuit in the starter armature winding

Possible malfunction	Diagnostics	Remedies
Low battery	The voltage at the battery terminals without load is less than 12V. When trying to start the engine, a cracking noise is heard from under the hood.	Charge the battery or replace it with a new one
Oxidation of battery terminals or wire terminals, their fit is not tight	When you try to start the car, the voltage in the on-board network drops much more than at the battery terminals. In this case, a crash may be heard under the hood.	Clean the contacts, lubricate them with petroleum jelly and tighten the terminals
The engine or attachments are jammed	Check the rotation of the crankshaft, pump and generator pulley.	Repair engine, generator, pump
The starter is faulty, the starter drive gear or flywheel ring teeth are damaged	Remove and inspect the starter.	Repair or replace starter
The starter switching circuit or starter relay is faulty, the wires are damaged, or the ignition switch contacts do not close	When the key is turned to position “II”, the starter traction relay does not operate (a click is not heard under the hood). Check the +12V supply to the control contact of the traction relay.	Replace starter relay, wires, ignition switch
The starter traction relay is faulty, there is a short circuit or break in the retractor winding, the relay armature is stuck	When the key is turned to position “II”, the traction relay does not operate (there is no click under the hood), but + 12V is supplied to the control contact of the traction relay. Remove the relay and check its operation.	Replace the traction relay
Contacts or wires of the traction relay are oxidized, poor ground contact	When the starter is turned on, a clicking sound is heard under the hood, but the starter armature does not rotate. Using an ohmmeter, check the resistance of the battery-starter circuit, as well as the ground wire. If the circuit is in good condition, remove the starter and check the operation of the traction relay by applying +12V to it from the battery	Tighten the terminals, clean the contacts, replace the traction relay
Open or short circuit in the holding winding of the traction relay	When you try to start the engine, you hear a crashing sound under the hood. The battery voltage is within normal limits. We check the traction relay with an ohmmeter or by its excessive heating.	Replace the traction relay
The starter armature rotates slowly or does not rotate at all. Check the traction relay by applying voltage to the starter contact bolt directly from the battery	Replace starter or armature
Freewheel slipping	When the starter is turned on, the armature rotates, the flywheel is stationary	Replace clutch or starter

Priora won't start, starter turns

Possible malfunction	Diagnostics	Remedies
There is no gasoline in the tank	On the instrument panel the fuel level indicator is at zero.	Pour gasoline
Battery is low	The voltage at the battery terminals without load is less than 12V. When trying to start the car, a crashing sound is heard from under the hood.	Charge the battery or replace it with a new one
Oxidation of battery terminals or wire terminals, their fit is not tight	When you try to start the engine, the voltage in the on-board network drops much more than at the battery terminals. In this case, a crash may be heard under the hood.	Clean the contacts, lubricate them with petroleum jelly and tighten the terminals
Unreliable connection of electrical circuits of engine control and power supply systems	Check the connections of the connectors and the reliability of the contacts in the blocks.	Fix faulty wire connections
Increased resistance to rotation of the crankshaft (scores on the shafts, bearing shells, cylinder-piston parts, deformation of the shafts, frozen engine oil, jammed generator, jammed coolant pump)	The crankshaft turns slowly. If the engine is started in severe frost, and the engine was working properly the day before, then most likely the engine oil has frozen. If you hear extraneous noise when starting the engine, check the free rotation of the pump and generator pulleys.	Use the recommended engine oil. Repair the engine. Replace the pump and generator.
Malfunction in the ignition system	Check for spark.	Check the circuits and devices of the ignition system. Replace faulty system elements.
The high voltage wires are connected in the wrong order or the wire is disconnected	Inspect.	Connect the wires in the correct order
The timing belt is broken or the belt teeth are cut off	Open the front timing cover and check.	Replace timing belt
Disturbed valve timing	Check the marks on the crankshaft and camshaft pulleys.	Set the correct shaft position
Malfunction of the computer (brains), its circuits, crankshaft position sensor or coolant temperature	Check the supply of +12V to the ECU, the sensor circuit, and the absence of damage to the sensors themselves.	Replace ECU, sensors.
The idle air regulator (IAC) or its circuits are faulty	Check the idle air control. When starting the engine, lightly press the gas pedal. If the engine starts and stalls when you release the gas pedal, the sensor is faulty.	Replace sensor
The fuse is blown or the main relay of the control system is faulty	Check fuse and relay.	Eliminate the cause of the blown fuse. Replace fuse and relay
Fuse blown, fuel pump relay. Circuit, relay or pump is faulty.	When the ignition is turned on, there is no sound of the pump running. Check the fuse. Apply voltage to the pump from the battery.	Clean contacts, replace faulty circuits, replace fuse, pump and relay.
The fuel filter is dirty, the water in the fuel line is frozen, the fuel line is damaged	Check the pressure in the fuel rail and the condition of the fuel lines.	Replace the filter, blow out or replace the fuel lines.
Insufficient pressure in the fuel rail	Check the pressure in the fuel rail, the pump strainer and the condition of the fuel lines.	Clean the filter. Replace pump, fuel pressure regulator
Faulty injectors or their power supply circuits	Check the injector windings with an ohmmeter. Check the chains for breaks.	Replace injectors, replace chains
Air leak into the intake tract	Inspect the joints and fittings of the hoses and clamps. During start-up, turn off the vacuum brake booster and plug the receiver fitting.	Eliminate air leaks, replace vacuum booster

Generator

When this element is working properly, it produces a voltage within 14 volts, provided that the engine is idling and there is no load on the vehicle's electrical system.

In this case, the first start leads to an increase in voltage by 2 volts. Later, stabilization occurs to standard levels. They are also affected by:

battery condition;
load;
air temperature.

Problems with the generator are very often the reason for the inability to start the engine. In cold weather, the voltage can fluctuate from minimum values (12.9) to maximum values of 14.8 volts.

The 16-valve Priora in such a situation needs to inspect its generator. It is easy to verify its functionality by connecting the power directly, bypassing the regulator. If it is possible to detect excess voltage, the latter relay needs to be replaced.

If the Priora does not start well when hot

In this case, see the second table; in addition to the reasons described, also pay attention to:

A pressure regulator that can discharge fuel through a membrane into the receiver.
DPKV contacts, if the sensor has been changed, check that the poles are connected correctly.
Faulty ignition module.

Let us remind you that in some cases the Priora does not start due to a faulty immobilizer or alarm system. In some cases, reflashing the engine ECU (electronic control unit) helps solve the problem of poor starting. And regular car maintenance will help eliminate problems of poor engine starting.

Source: xn--80aal0a.xn--80asehdb

Story

The ignition system in Lada cars has changed over generations. Earlier cars with carburetor fuel injection used a distributor ignition system, which is quite unreliable and required manual adjustment and frequent maintenance.

The distributor was replaced with the advent of injection engines by a modular ignition system; a spark in such a system was produced by a module consisting of two coils. This system began to use a crankshaft position sensor, which helped the engine control unit determine the top dead center and compression stroke of the fuel-air mixture.