Error P0340 - what it means, symptoms, causes, diagnosis, solution

Owners of 8–16-valve fuel-injected cars produced in Togliatti often encounter engine malfunctions. At the same time, the Check Engine light often lights up. Among the mass of possible malfunctions, diagnostics often reveal a malfunction of the camshaft position sensor (CPS). Error code P0340 is a common problem on VAZ models. Next, we will tell you why the problem occurs, what signs indicate a DPRV failure, and how to change it.

Principle of operation

The DPRV sensor operates on the Hall principle and is capable of determining the position of the camshaft as accurately as possible at different periods of operation by reading pulses. The device transmits the received information to the electronic control unit (ECU). After this, the main controller adjusts the fuel injection for each injector at a certain time. That is, knowing the position of the camshaft, the on-board computer is able to establish a phased supply of gasoline to the cylinders.

Trouble Code P0340 – Camshaft Position Sensor A Circuit Malfunction (Bank 1)

Trouble code P0340 reads "Camshaft Position Sensor A Circuit Malfunction (Bank 1)." Often, in programs that work with an OBD-2 scanner, the name may have the English spelling “Camshaft Position Sensor “A” Circuit Malfunction (Bank 1).”

Technical description and interpretation of error P0340

This diagnostic trouble code (DTC) is a generic powertrain code. The P0340 code is considered a generic code because it applies to all makes and models of vehicles (1996 and newer). Although the specific repair steps may vary slightly depending on the model.

This code indicates that a problem has been detected in the camshaft position sensor circuit. Since we are talking about a circuit, this means that the problem could lie in any part of the circuit - the sensor itself, the wiring, or the ECU. Therefore, the malfunction does not always lie in the camshaft position sensor itself.

Symptoms of malfunction

The main driver symptom of P0340 is the MIL (Malfunction Indicator Light). It is also called Check engine or simply “check light”.

They can also appear as:

1. Difficult start or no start;
2. Difficult starting with misfires;
3. Loss of engine power.

Reasons for the error

A P0340 code may mean that one or more of the following problems have occurred:

• Wires or connectors in a circuit may be grounded, shorted, or open
• The camshaft position sensor may have failed.
• There may be a fault in the ECU
• There is an open circuit
• The crankshaft position sensor may be faulty.

How to Troubleshoot or Reset Trouble Code P0340

Some suggested steps to troubleshoot and fix error code P0340:

1. Visual inspection of all electrical wiring and connectors in the circuit.
2. Checking the integrity of the circuit wiring.
3. Check the operation (voltage) of the camshaft position sensor.
4. If necessary, replace the camshaft position sensor.
5. Also check the crankshaft position diagram.
6. Replace circuit wiring and/or connectors as necessary.
7. Diagnose/replace ECU as needed.

Diagnosis and problem solving

Check the engine or review the vehicle's service history for recent timing belt repairs. As well as the camshaft sensor or crankshaft sensor.

Signs of an error

For balanced engine operation, the ECU collects data from all sensors. If there is no signal from one of them or having received incorrect parameters, the computer warns the driver about this. To do this, he lights up the Check Engine icon on the instrument panel. If there is poor communication with the DPRV, the on-board controller also signals a problem in the system. During diagnostics, the scanner will show error P0340 (quite often on VAZ 2114–2115). Over the long years of using “fours” and “tags”, owners have learned to recognize signs of engine malfunction that are directly related to the camshaft position sensor:

1. The engine refuses to start.
2. The car starts with great difficulty.
3. The engine stalls at idle speed.
4. Failures appear and former power is lost.
5. Fuel consumption increases.
6. The engine starts to stall.
7. Check Engine light is on.

If the listed symptoms are not observed, and the diagnostic controller shows error P0340, then most likely a failure occurred in the computer itself. On VAZ 2110, 2111, 2112, 21114, 21124 and other models, Bosch M7.9.7 and January 7.2 ECUs were installed. They may become buggy after free firmware updates.

Finding the cause of error P0340

Using a diagnostic scanner, you need to make sure that there is an error. After this, you can begin to search for the culprit of its appearance:

1. Check the DPRV wiring (between the connector and the sensor) for damage, short circuit or corrosion.
2. Check the sensor connector for mechanical damage or corrosion.
3. Check the wiring from the connector to the ECU for damage, short circuit or corrosion.
4. Eliminate the causes of other errors that are stored in the ECU memory, which may be related to the operation of the DPRV.
5. Use a scanner or oscilloscope to check the voltage of the DPRV for compliance with performance indicators (individually for each car).
6. If the DPRV voltage readings are incorrect, the sensor must be replaced.
7. If the voltage reading is within the normal range, the engine control module may be faulty. It may need to be replaced or reprogrammed.

Common mistakes when diagnosing P0340

Before replacing the DPRV, it is very important to carefully check the wiring and connectors of the sensor to eliminate these causes of malfunction. Very often this is not done, and replacing the sensor does not help solve the problem.

Another common mistake is that the diagnostician does not take into account the problem with the presence of misfires or a malfunction of the crankshaft position sensor (CPS). These factors can cause the P0340 code to appear.

Read all the details about checking the camshaft sensor in our article - https://autofakty.com/datchik-polozheniya-raspredvala-raspolozhenie-neispravnosti-proverka/

Reasons for failure

Quite often, the cause of error P0340 on VAZ models is the sensor itself (DPRV). Over time, its internal contacts are destroyed. But sometimes a failure occurs due to other reasons, such as:

1. Wear of camshaft pulleys (appearance of backlash).
2. The timing belt jumped 1-2 teeth.
3. The wires on the power supply have oxidized.
4. Broken wire or short circuit.
5. The plug came loose randomly.

Very often error P0340 appears on VAZ Kalina models. The car simply refuses to drive without changing the throttle. Here, the fault is often the controller itself, located under the heating radiator, where it is simply filled with coolant (antifreeze, antifreeze) when depressurized. The experts already know: if the “brains” are washed and dried, the fault disappears and Kalina will drive again.

How to replace the camshaft sensor on a VAZ 2115 - step-by-step instructions

1. Turn off the engine if it is running.

3. Disconnect the power connector for the phase sensor.

4. Using a “10” socket, unscrew the bolt securing the camshaft sensor.

5. We take out the sensor, perform a visual inspection, and also, if necessary, check it according to the principle described above. If the DPRV is faulty , replace it with a new one.

6. Assembly is carried out in reverse order. After replacement, start the engine and check if the “Check” light is on. Do a test drive to check that everything is ok.

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On which engines does p0340 pop up more often?

According to the observations of service workshop specialists, failure of the air flow control valve occurs more often on 16-valve engines. But engines with 8 valves also suffer from error P0340, especially after installing gas equipment (LPG). Moreover, the malfunction is repeated regularly, so the technicians have to adjust the gas equipment to the optimal fuel supply mode again and again. As a result, such cars have chronic problems with engine starting and loss of power.

Replacing the device

Dismantling the part is not difficult. We find it behind the air filter. The phase sensor housing is secured with a bolt.

First, disconnect the terminals from the battery. In this case, the electronic unit will be de-energized. The control unit memory is reset to zero.

If you don't turn off the on-board network, you won't feel the difference. After replacement, the unit will maintain the same mode as with a faulty phase sensor. Process control returns to normal only after several engine starts.

Tools and materials for removing the sensor are available in the arsenal of every motorist. You need to prepare a key for ten, sealant, alcohol, rags. It is convenient to unscrew the fastening bolt using a socket wrench. Take the sealant from ZOLLEX. It is designed for temperatures up to 350°C.

Replacing the sensor will take 10 minutes. First of all, disconnect the wire block from the phase sensor. To do this, you need to bend the latch with one hand and pull out the wiring with the other. Next, unscrew the only bolt. It's on the back side. We take out the body of the spare part.

Do not apply great force when removing the DF.

Moreover, you should not use impact-type locksmith tools. The plastic housing may crack. Residues will fall inside.

Before installing a new device, you need to clean the seat. Apply a thin layer of sealant to the joining ring. Let stand for a few minutes. We put the camshaft sensor in place. We tighten the bolt.

Feel free to connect the wires. Oxidized contacts on the plug are cleaned with alcohol. The pinout of the wires will not be disturbed. The VAZ 2115 has a lock. When connecting the terminal block, watch the latch. The latch should engage.

That's all. Don't forget to connect the terminal to the battery. Turn on the ignition. We start the car and watch the instrument panel. The indicator should go out within a second after starting. This means that the replacement was successful.

Of course, the main test of the VAZ 2115 will take place on the road. Therefore, we turn on the gear and enjoy the growl of the engine. If the problem is solved, the engine will restore its former agility, and the car will restore its acceleration dynamics.

Source

Replacing the DPRV

If there is no wire break, and the power supply is not in place, then most likely the problem is in the DPRV itself. It needs to be changed. To work, you will need a 10 mm socket wrench (head). The sensor is located in a visible place, on the right side of the head. Attached with only 2 bolts. But despite the close and convenient location, getting to the distant bolt is very inconvenient. There have been cases in practice when owners removed the intake manifold and the ramp with injectors. Other owners simply broke the sensor housing and then removed the bolt. In general, the process of replacing the DPRV looks like this:

1. Disconnect the negative terminal from the battery.
2. Disconnect the DPRV plug.
3. Unscrew the 2 sensor mounting bolts.
4. Install a new DPRV.
5. Connect the power plug.
6. Place the negative terminal on the battery.

There is no need to start the car right away. First, turn the ignition on and off 2-3 times. Let the ECU see the working sensor. Then you can start the car and check the quality of the engine. If the Check Engine icon is still on, you need to connect the controller and erase error P0340.

Where is the unit located?

The sensor is located on the engine in two versions: on an 8-valve engine it is installed on the cylinder head, and on a 16-valve engine it is installed on the side of the drive camshaft in the area of ​​the generator. It can be easily found and dismantled without visiting a car dealership, although the second option will require more effort and skills.

Phase sensor connector VAZ 2114 (8 valves)

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:

1. Using an error scanner, check the ECU memory for errors p0340 and possible others. If only one error is detected (or related ones, for example, p0342, p0343), then you should try to reset, as indicated above. That is, remove them using software or by disconnecting the negative terminal of the battery for 10...20 seconds. If the error disappears after starting the engine, it means that it was a false response of the sensor or ECU. If the error occurs again (you should read the error number again with the scanner), then you need to continue further diagnostics and repairs.
2. Check the latch, which ensures rigid contact between the chip and the sensor body. In some situations, it can be broken off, and this leads to loss of contact between all or individual wires and contacts on the sensor.
3. Check the quality of installation of the sensor in its mounting location. In particular, check the tightening torque of the nut (usually the sensor is secured using a bolt with a nut with a diameter of 10 mm or similar, depending on the specific engine). Make sure that the engine has the correct sensor for this particular motor. In particular, not only in terms of fastening, but also in model, since sensors may differ in both geometric shape and size, and because of this, the sensitive element of the sensor will not detect the passage of a rapper near it, which will lead to the absence of corresponding signals on the ECU. If the sensor is not suitable, you need to buy a new camshaft sensor and replace it.
4. Visually check the condition of the contacts and terminals in the electrical circuit for connecting the camshaft sensor. In some cases, oxidation (rust) occurs on critical terminals, which leads to a decrease in the quality of contact. This is due to exposure to moisture and/or simply old age. If oxides are detected, you must get rid of them by thoroughly wiping the contacts. To clean difficult stains, you can use special electrical contact cleaners.
5. Using a multimeter in continuity mode or measuring insulation resistance, you need to verify the integrity of the wires coming from the computer to the camshaft sensor. Usually there are three wires. In addition to checking the integrity of the wires, it is also necessary to check the insulation resistance value in pairs between them, as well as between each of the wires and the machine body (“ground”). However, in the latter case, the ground wire will “ring” with the body. Moreover, in the process of the described test, the multimeter probes must be placed on the contacts of the corresponding connectors.

VAZ error codes - table with a list of all errors

Very often, various errors occur in VAZ cars, and in fact, it is not necessary to go to a mechanic to diagnose them; it is enough to read the error code and look at its value in the error table.

The error codes are the same and apply to the following VAZ brands:

1118 Kalina, 2104, 21041, 2105, 2107, 21074, 2109, 21093, 21099, 2110, 21102, 21103, 2111, 2112, 2113, 2114, 21114, 21124, 21 15 with engine injector 8 and 16 valves, 21150 , 21154, 2131, 2170 Priora, 2190 Granta, 2123, 21214, 2131 Niva;