Error P0343 - what it means, symptoms, causes, diagnosis, solution

What does code P0343 mean?

P0343 is triggered when the engine control module (ECU) receives a faulty signal from the camshaft position sensor (CPS).

A common cause is a faulty camshaft sensor or damaged wiring. The DPRV is installed on one of the camshafts. P0343 is a common trouble code that has been used by all automakers since approximately 2000.

Some engines have multiple camshaft position sensors. Since the camshaft must be in sync with the crankshaft sensor when starting, a common symptom is that the engine will be hard to start or not start at all.

The four-stroke crankshaft rotates two revolutions per cycle, and the camshafts rotate one revolution per cycle. Older cars usually do not have a camshaft sensor, but only a crankshaft sensor. This is because older cars don't need to know what RPM the crankshaft is at.

Each cylinder is supplied with ignition and fuel once every two revolutions of the crankshaft. To do this, the DPRV is used to determine whether the cylinder is in the intake or combustion cycle.

In older cars without a camshaft sensor, the spark plugs fire twice per revolution, this is called "wasted spark." Thus, to avoid firing the ignition coils twice per revolution when only one is required, a camshaft sensor is used.

Location of fuse and relay blocks Lada 4×4

If during the inspection it turns out that the camshaft position sensor itself has failed, then it must be replaced. As a rule, these units are non-repairable, since their body is sealed and cannot be disassembled. The sensor is inexpensive, and the replacement procedure is simple, and even a novice car enthusiast can handle it.

The sensor replacement algorithm is as follows:

With the engine not running, disconnect the negative terminal from the battery.
Disconnect the “chip” from the camshaft position sensor (as when checking).
Depending on the vehicle model, it is necessary to remove parts that prevent access to the sensor. For example, on modern cars like the Lada Vesta, it is necessary to remove the bracket for auxiliary units.
Using a wrench, unscrew one or two mounting bolts, depending on the type of fastening. The size of the wrench can be different, usually for VAZs it is a 10 mm wrench.
After dismantling the mount, you must similarly remove the sensor from its seat.
Installing a new sensor is performed in reverse order.
Connect the negative terminal to the battery.

Replacing this part is relatively easy. The on-board computer registers errors such as P0340, PO342, PO343.

Error P0340 appears on the self-diagnosis system if the crankshaft rotates. Code P0342 - the camshaft electrical circuit shows a low signal and code P0343, accordingly, shows a high signal. It is necessary to check the wiring - for this purpose it is good to use an oscilloscope or other testing device.

Mechanical specialists, even if the sensor is in good working order, still recommend changing it every 4-5 years - such prevention will protect you from breakdowns and accidents, especially since the part is very cheap despite its importance. After all, the semiconductors inside the sensor react poorly to temperature fluctuations - remember your school physics course.

Also interesting: Chevrolet Niva suspension: front, rear, device and tuning

There is a special offer on our website. You can get a free consultation with our corporate lawyer by simply submitting your question in the form below.

The preparatory stage will require the collection of certain tools:

additional lighting, if required;
Phillips screwdriver;
rags;
new controller;
key to 10.

The sequence of actions is described as simply as possible:

First open the hood.
The tie from the rubber pipe of the air duct must be released.
We remove the air duct itself.
The controller is easy to find in the first part of the block.
Remove the terminals and unscrew the bolt. The main thing is that the phase is maintained.
All that remains is to remove the sensor and replace it with a new part.
We put on the terminals and mount the air duct pipe back.

Troubleshooting table for P0343

Error	Description	Causes	Elimination
P0343	The camshaft position sensor circuit is high.	Camshaft sensor malfunction.

Damage to the 5V power wire from the control module (ECM).

Corrosion/poor connection in sensor connector.

Faulty ground wire to ECM.

Short circuit of the power and ground wires.

Low battery voltage / faulty alternator.

Repair any damage to the wiring between the camshaft sensor and the control unit.

Clean the sensor from oil.

Clean the sensor connector.

Replace the camshaft sensor.

Meter design and location

The operating principle of the DPRV is based on the Hall effect - the sensor reacts to the approach of a metal mass by changing the voltage on the signal wire. The design of the device is similar to another element - the crankshaft position detector. Inside the plastic case there is a coil where the 12 V on-board voltage is constantly supplied.

The meter is installed on the engine cylinder head in close proximity to the camshaft. The latter is equipped with a special plate or gear, whose rotation affects the DPRV. The work algorithm looks like this:

After turning on the ignition and starting the engine, a supply voltage of 12 V is supplied to the sensor. Through the third signal wire, the element supplies the controller with a voltage of 90–95% of the original one.
When the protrusion on the rotating part of the camshaft passes next to the DPRV housing, the voltage at the signal contact drops to 0.2–0.4 volts, depending on the design of the device and the vehicle model.
When the voltage drops, the electronic unit clearly “sees” the valve timing, promptly supplies the fuel mixture to the engine cylinders and directs the spark discharge to the desired spark plug.

When the meter is faulty, the electronics are unable to control the operation of the gas distribution mechanism. In such cases, the control unit goes into error and is guided by the signals of other meters. Spark generation and fuel supply are adjusted according to the programmed program, which affects the operation of the power unit.

How to Diagnose Trouble Code P0343

This is a guide on how a professional auto mechanic would diagnose a P0343 code. This may require some skill in vehicle wiring and the necessary tools. You will receive information on how to do everything correctly, without replacing faulty parts.

Always connect the car charger when troubleshooting. Low voltage can cause other error codes and even damage control units.

If you do not find any damage to the wires or the DPRV, then it may be a faulty engine control unit. But this happens really rarely. Before replacing the control unit, make sure you check everything else as they are quite expensive.

P0343 is triggered when the engine control module (ECU) receives a faulty signal from the camshaft position sensor (CPS).

Each cylinder is supplied with ignition and fuel once every two revolutions of the crankshaft. To do this, the DPRV is used to determine whether the cylinder is in the intake or combustion cycle.

More information about testing and troubleshooting

The Niva Chevrolet camshaft sensor creates stable engine operation. The work is based on the Hall effect. Thanks to it, the tilt of the gas distribution device is controlled according to the crankshaft. The system that controls the operation of the spark plugs and the flow of gasoline receives a corresponding signal.

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It works based on monitoring the potential difference of the required electricity, and is associated with the operation of the crankshaft position analyzer. Simply put, it informs the location of the piston of the internal combustion engine cylinder, while all cylinder stroke cycles occur sequentially. If it stops working, the device and indicator turn on, thanks to which a mixture of air and fuel occurs, dosing is suspended and the reserve mode is activated. Replacement is recommended every five years. If it is faulty, the on-board computer will display the following errors, PO343, PO342, PO340.

Connecting scanners or computers equipped with special software is the best option for identifying most faults. The main thing is to choose software that matches the current car brand.

If the camshaft sensor is faulty, the following error options appear:

P0339. In this case, intermittent signals are received from the sensors.
P0343. The signal is at a high level, but it exceeds the norm.
P0342. The signal level for the electrical circuit is too low.
P0341. The compression/intake strokes of the cylinder-piston group differ from the current valve timing.
P0340. There is no position locator signal.

Most buyers do not have scanners or laptops with software. Therefore, a simpler method is to check with a multimeter.

In total, there are no more than 3 stages in such diagnostics:

The wiring is subjected to visual inspection. Next, the circuit is rung to check for a break.
The outgoing current is measured at the control contact of the sensor. There is definitely a malfunction if there is something wrong with it.
Check functionality by approaching a metal object.

During the first stage, the most important thing is to make sure that the wiring remains intact and that the contact of the connecting block is reliable enough. Conducting cables should be inspected additionally to ensure that there is no melting of the insulation or cracks or kinks. Using a multimeter it is easy to make calls and search for a break. An additional responsibility is cleansing from oxidation. This is the first sign of problems.

After diagnosing the entire system, you can move on to the sensor itself. Standard alligator clips are easily replaced with wires with needles. The main thing is to correctly determine the location of the two power contacts and the third wire going to the controller. The voltage between the bus ground and the contact is checked by turning on the power. The signal should remain at normal level.

If the values obtained are higher or lower than normal, the sensor must be replaced.

The part is completely removed from the engine in order to perform final diagnostics and make a final decision.

Before testing the sensor using a multimeter or other electronic tools, you must check its mechanical integrity. In particular, it is installed in a housing with an O-ring, ensuring its secure fastening. We need to check its condition. It would also be useful to check the integrity of the sensor body, whether there are cracks or other damage on it. It is advisable to check the drive disk to see if the teeth are damaged or if there are metal shavings on the sensor body or nearby.

On the Internet you can find information that supposedly the DPRV can be determined to work by simply checking its magnetic properties. In particular, bring a small metal part to its end (the working sensitive part), which should “stick” to the sensor. In fact, this is not the case, and a non-working DPRV may or may not have magnetic properties. Accordingly, verification must be performed using other methods.

There are two main ways to test the camshaft position sensor - using an electronic multimeter and using an oscilloscope. The first method is simpler and faster, but the second is more accurate and provides more diagnostic information.

Troubleshooting table for P0343

Error	Description	Causes	Elimination
P0343	The camshaft position sensor circuit is high.	Camshaft sensor malfunction.

Damage to the 5V power wire from the control module (ECM).

Corrosion/poor connection in sensor connector.

Faulty ground wire to ECM.

Short circuit of the power and ground wires.

Low battery voltage / faulty alternator.

Repair any damage to the wiring between the camshaft sensor and the control unit.

Clean the sensor from oil.

Clean the sensor connector.

Replace the camshaft sensor.

Recommended Tools to Fix P0343

To read fault codes - FOXWELL NT301. For advanced troubleshooting, you may need a more advanced scanner.
Car charger: with battery repair function or simple.
To check the integrity of the wiring and sensor, use a regular digital multimeter or a more expensive device.
For an extended check of the signal from the camshaft sensor, use an oscilloscope.

Let's take a closer look

Trouble code P0343 reads "Camshaft Position Sensor A Circuit High (Bank 1)." Often, in programs that work with an OBD-2 scanner, the name may have the English spelling “Camshaft Position Sensor “A” Circuit High Input (Bank 1)”.

Chevrolet Niva error codes: decoding and description of meanings

The popular Russian-made model is very widespread in the CIS countries due to its optimal cost and increased cross-country ability, which is critically important in the conditions of domestic operation. Motorists buy cars for off-road travel and small towns, where the quality of roads leaves much to be desired.

The disadvantages of the car include weak wiring - when the load increases to the design limit, on-board electronic systems often fail, which causes software failures. Chevy Niva error codes appear on the dashboard display or are detected using special equipment, but the common thing is that they all indicate a malfunction of a specific component.

Chevrolet Niva error diagnosis

The most reliable way to identify what is wrong with a car is to diagnose electrical appliances and equipment. The procedure allows you to accurately identify breakdowns and quickly repair your car.

There are two ways to detect a problem in a car.

The simplest procedure allows the motorist to independently identify the damaged area and repair the damage. Thanks to the successful firmware of the on-board computer, some errors are displayed on the standard display. In this case, nothing happens on its own - you will need to perform several steps manually:

If the manipulations are correct, one of the indicated codes will appear on the display, and each Niva Chevrolet error number will be responsible for its own section of the highway:

Oxygen

The Chevrolet Niva oxygen sensor is also called a lambda probe; it is located in the exhaust gas system on the receiving pipe. The oxygen contained in the exhaust gas interacts with it, thereby creating a potential difference at the outlet. It varies from approximately 0.1 to 0.9 V. For it to function normally, its temperature must be at least 360 degrees.

https://www.youtube.com/watch?v=SqqIBAU8osQ

How to Diagnose Trouble Code P0343

Always connect the car charger when troubleshooting. Low voltage can cause other error codes and even damage control units.

We pay for photo reports on car repairs. Earnings from 10,000 rubles/month.

Error p0340 is defined as a malfunction of the camshaft position sensor circuit (in English - Camshaft Position Sensor A Circuit). It can occur for various reasons - when the camshaft sensor fails, there are faults in its wiring, problems in the operation of the engine control unit (ECU). The error itself is not critical, and if it occurs, the machine can be used. However, some inconveniences arise - increased fuel consumption, reduced power, etc. Eliminating the reasons why error code p0340 was generated is not difficult, and most car owners can handle it.

Speeds

The Chevrolet Niva speed sensor helps to determine exactly how fast the car is moving. The received information is transmitted to the speedometer. In addition to this, it also performs such functions as:

Controls fuel consumption
Displays information on the dashboard
In cars with automatic transmission, it is part of the system that is responsible for engine control.

If for some reason it fails, then further movement becomes difficult. The causes of failure may be contamination or oxidation. If the device stops working, first of all you need to check for the following problems:

Contacts have oxidized
There was a break in the electrical wiring
Wire insulation is damaged
There are mechanical damages

Diagnostics can be done both visually and using a multimeter. To do this, the sensor is removed, after which you need to connect the plus to the contacts, and the minus to the ground of the car. We switch the multimeter to power measurement mode and if it shows that the voltage has increased, then the element can be considered faulty.

To change it you need to disconnect the battery. When the car is de-energized, we find the sensor which is located on the rear cover of the transfer case. Disconnect the terminal from it and unscrew it with a wrench.

Diagnostics can be done both visually and using a multimeter. To do this, the sensor is removed, after which you need to connect the plus to the contacts, and the minus to the ground of the car. We switch the multimeter to power measurement mode and if it shows that the voltage has increased, then the element can be considered faulty.

Symptoms of malfunction

The main driver symptom of P0343 is the MIL (Malfunction Indicator Light). It is also called Check engine or simply “check light”.

They can also appear as:

The vehicle will most likely run with this trouble code. But it may be difficult to start, and there may also be a drop in power and unstable engine operation. To avoid damage to other engine components, if this code is detected, it is recommended that the problem be repaired as soon as possible.

Idle move

The Chevrolet Niva idle speed sensor ensures the supply of air to the engine during idling. When a signal is received by the ECU, the sensor moves the valve, changing the flow hole in the air valve. If it fails, it will not be possible to repair it, since it has a non-demountable design.

To replace it, you need to prepare a thirteen socket wrench, pliers and a Phillips screwdriver and do the following:

Unscrew the mounting bolts and remove the housing from the throttle valve
Disconnect the wiring connector of the engine regulator
Unscrew a couple of screws on the throttle body
Removing the regulator
Remove the O-ring from the existing hole.

To summarize, we can conclude that the failure of any of the above elements can seriously affect the operation of the car, therefore, in the event of a malfunction, you need to replace a new part as soon as possible. All replacement work can be carried out independently.

Operation of the DPRV sensor

First of all, you need to decide what a crankshaft position sensor (abbreviated as CPS) is, what it is needed for and where it is installed. The main function of this device is to determine the position of the camshaft at a specific moment in time. The relevant information is transmitted to the electronic engine control unit (ECU) so that it programmatically calculates the timing of fuel injection from each injector. This ensures the so-called phased injection. If its operation is disrupted, the control unit automatically goes into emergency mode, in which pair-parallel injection is provided instead of phased injection. This leads to excessive fuel consumption and loss of engine power.

To resolve the P0340 code, it is also important to know the location of the sensor on the engine. This is relevant from the point of view that in the event of such an error, additional diagnostics of the DPRV and/or its wiring are most often performed. So, on eight-valve engines, the sensor is usually located at the end of the cylinder head, closer to the first cylinder. On sixteen-valve engines, similarly, it is also installed on the cylinder head, in close proximity to the first cylinder. Its close location to the first cylinder is due to the fact that on gasoline engines the sensor records the position of the piston of this cylinder at the so-called top dead center. On diesel engines, the position of all pistons is recorded.

Removing the phase sensor

The Niva Chevrolet phase sensor operates on the Hall effect principle. It works as follows: there is a special pin on the camshaft and when it runs parallel to the end of the sensor, the sensor begins to transmit a voltage pulse to the existing controller, which should have the same position as the piston of the first cylinder in the compression position. That is, it is needed so that fuel injection and the order of operation of the engine’s cylinders correspond to each other.

In the event of a failure, it or its chain controller writes a special code into its memory and activates the alarm. And to remove it you need:

Disconnect the battery
Remove the decorative casing from the engine
Disconnect the connector from the sensor
We unscrew the bolt that secures it to the cylinder block.
We remove the part from its seat
Install the new one in reverse order

The part is removed from the engine to finally verify that there is a specific problem. On the cylinder head this structure is inserted into a special hole. Next, everything is screwed on with one bolt. It is enough to unscrew this connecting element, and then pull out the part and wipe it off with engine oil. The main thing is not to disconnect the block to which the additional wires are connected.

The ignition can be turned on after the multimeter is connected - to the middle contact, the ground of the car. The steel element is brought close to the end part of the part. For example, a regular key is perfect for this. All that remains is to monitor the readings that appear on the display. If everything is normal with the sensor, it reacts to the approach of any metal whose voltage is 02.-0.4 V. A high indicator is not taken into account.

If there are no changes in the tester’s performance, the device definitely needs to be changed. The main thing is to remember about the possibility of missing an o-ring even with new original spare parts. This part of the structure must be purchased separately, or an old one must be used.

Disconnect the negative terminal from the battery
We remove the decorative casing to gain access to the element we need
We press the block and disconnect it from the sensor
Unscrew the bolt that secures the part to the cylinder block
We remove the part from the existing hole in the block head
We change to a new element, doing all the steps in reverse order.

Also interesting: Checking control devices and their sensors Niva 2121, Niva 2131

It is recommended to replace it every five years, even if it is working properly. The replacement job takes about twenty minutes, everything will depend on what technical skills you have.

Signs of an error

There are a number of indirect signs by which you can determine that there are problems with the camshaft position sensor or its wiring. The situations described below may indicate other breakdowns, so if they occur, additional diagnostics with an error scanner (for example, the popular ELM 327 device or its equivalent) is needed. So, when a sensor error p0340 occurs:

It is worth noting that the listed changes in the behavior of the car are not so relevant for engines running on gasoline. The loss of power and increase in fuel consumption are not so great. The only inconvenience that can be noted is that the car starts worse, you have to turn the starter for a long time.

But as for cars equipped with gas-cylinder equipment, here the problems described above can manifest themselves “in full.” The loss of power and increase in consumption will be significant. Another trouble will await owners of cars that have modern gas equipment installed, in particular the fourth generation. So, this equipment has its own electronic control unit. And if a phase sensor error 0340 occurs (as the DPRV is sometimes called), there will be a constant disruption of the operating parameters. Because of this, gas-cylinder equipment, firstly, will need to be constantly reconfigured, and secondly, despite all the adjustments, it will still work in a non-optimal mode, consume more fuel and cause the driver problems with loss of power of the car, constantly stall and etc.

Error P1602

P1602 (Court Controller, Power Loss) is another common Chevrolet Niva error.

Code P1602 is entered if the following conditions are met:

The codes should be cleared using a scan tool. If the code is entered again, check the power supply circuit from the battery to pin “12” of the controller.

What errors have you encountered on Chevrolet Niva? You will find other reference information on ChevyNiva here.

Keywords: Niva on-board computer | Niva engine | esud niva

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Reasons for the error

There are only three main causes of engine error p0340:

Sometimes the cause of error p0340 is incorrect installation of the sensor. However, this is a rather rare case, since it only has one seat. Perhaps the fastening is not strong enough (small tightening torque, which is why the sensor can vibrate when driving) or there is a large gap between the working (sensitive) part of the sensor and the so-called rapper - a tooth on the indicator wheel located on the camshaft.

How to run diagnostics?

Press the daily mileage reset button and hold it. Turn on the ignition and release the button.

The arrows on the dashboard start moving - this is the entry into the mode. Press the button briefly twice and it will display an error code.

As follows:

Nothing is clear, but there is a special table that deciphers these codes. It looks like this.

Sometimes it happens that the code we need is not in the table. This is fine. If the figure is not the same as in the table, then this means the presence of two malfunctions at the same time. For example, code 6 means the simultaneous presence of codes 2 and 4. And code 10 means errors 2 and 8.

All other error codes are deciphered in the same way. True, this system is quite primitive. Normal diagnostic tools have more detailed information about faults. The codes would look, for example, like this:

“P0303” - 03 means misfire, and the second 03 is the cylinder number. That is, the engine is tripping.

Error codes on the dashboard provide little information. It is much better to use special diagnostic equipment. Even the cheapest one can scan almost all Chevrolet Niva engine errors.

It may happen that an unknown combination of numbers and symbols appears on the dashboard, this indicates that the on-board computer is warning you that there are certain malfunctions in the car, and in order to correctly decipher the error codes on the Niva Chevrolet car and make the necessary repairs, you need to know what this or that information warns about. This article will help you with this, as in it we will look in detail at what different combinations of numbers mean and how to correct them.

But before we look at what errors there may be, let’s figure out how to detect and decipher them in general. In order to do this, you must first of all diagnose the car itself, since you can’t do without it. One of the simplest diagnostic methods is the information that appears on the dashboard, but in addition to numbers, certain phrases can also be displayed, but the car owner cannot always understand the translation of this message.

To find out in more detail about the causes of a breakdown on a Niva Chevrolet car, you can use a special scanner. It is a laptop computer with special software installed, thanks to which self-diagnosis occurs without any problems.

Now let's take a closer look at what errors can appear in the Chevrolet Niva SUV and what they mean.

On which cars is this problem most common?

The problem with code P0343 can occur on different machines, but there are always statistics on which brands this error occurs more often. Here is a list of some of them:

Audi (Audi a4, Audi TT)
BMW
Cadillac (Cadillac SRX)
Chery (Chery Amulet, Jagi, M11, Tiggo)
Chevrolet (Chevrolet Avalanche, Aveo, Lacetti, Traverse)
Chrysler
Citroen (Citroen C4)
Dodge (Dodge Ram)
Ford
Geely (Geely MK)
Hyundai (Hyundai Accent)
Kia (Kia Rio, Sportage)
Lexus
Mercedes
Opel (Opel Corsa)
Peugeot (Peugeot 308)
Skoda (Skoda Octavia)
Toyota (Toyota Camry)
Volkswagen (VW Beatle, Jetta, Passat, Tiguan)
VAZ 2110, 2111, 2112, 2114, 2115
Volga Chrysler, 31105
Gazelle Chrysler, 405
Lada Vesta, Granta, Kalina, Largus, Niva, Priora
UAZ Patriot

With fault code P0343, you can sometimes encounter other errors. The most common are: P0030, P0036, P0124, P0332, P0335, P0336, P0340, P0341, P0342, P0345, P0346, P0347, P0348, P0349, P0365, P0366, P0367, P0368, P0369, P039 0, P0391, P0392, P0393 , P0394, P0606, P2122, P2138.

How to get rid of error p0340

Methods for getting rid of malfunctions that caused the formation of error p0340 (malfunction in the camshaft position sensor circuit) depend on the causes of their occurrence, as well as the specific car model - for example, Nissan, Ford, Chevrolet, Opel, Toyota. , VAZ (in particular, VAZ 2114). However, the general verification algorithm will be as follows:

Scheme for checking the PRV sensor

Finally, it is worth noting that when identifying malfunctions of the camshaft sensor, it makes sense to check the operation of the crankshaft sensor, since these shafts work synchronously, and if there is no signal from the camshaft sensor, then the ECU uses signals from the crankshaft sensor. It is necessary to check whether there are any errors in the memory of the electronic engine control unit regarding the DPKV, and also, if possible, inspect its mechanical condition and wiring (similar to the DPKV).

Air flow

The air flow of the Niva Chevrolet is controlled using a hot-wire sensor, which is located between the hose of the intake pipe and the air filter. The magnitude of the direct current depends on the direction and amount of moving air that passes through it. In the event of a system malfunction, a code is stored in memory and the alarm is activated.

To replace, you need to prepare a 10mm wrench and a screwdriver and do the following:

Disconnect the connector from the sensor
Loosen the air pipe clamp
We unscrew the bolts that secure the sensor and the o-ring
Installing a new one