What does P0343 mean?
Trouble P0343 is a common trouble code that indicates the camshaft position sensor circuit is too high. This sensor is electromagnetic and is connected to the rotating part of the camshaft to record the position of the teeth, as well as the stroke of each piston, so that the car's computer can control fuel injection and ignition timing. Changing the position of the camshaft creates different gaps that change the magnetic field to change the sensor voltage. If the vehicle's PCM detects that the camshaft position sensor circuit voltage is too high compared to the manufacturer's specification, it will store P0343.
Decoding codes
Next, we will look at the most common codes encountered during diagnostics of on-board computers of VAZ 2114 cars. Of course, on-board computers are also electronics, and they can cause certain failures, such is the specificity of their operation. However, often the fault codes displayed by the on-board computer are still true.
Description of the error
We will not consider all codes without exception, but especially for our readers we have selected errors that occur most often when diagnosing VAZs.
| Codes | Description |
| 0102, 0103 | Incorrect signal level of the mass air flow control indicator. |
| 0112, 0113 | Incorrect signal from the intake air temperature indicator - the element needs to be replaced. |
| 0115 — 0118 | Incorrect signal from the antifreeze temperature measuring element - the indicator needs to be replaced. |
| 0122, 0123 | Interference or incorrect signal from the throttle position control indicator - it is advisable to replace the element. |
| 0130, 0131 | The oxygen sensor is faulty. |
| 0135 — 0138 | The oxygen sensor heating device has failed - the component must be replaced. |
| 0030 | Failures in operation or a break in the circuit of the oxygen sensor heater to the converter were detected. |
| 0201 — 0204 | An open circuit was detected in the injector control circuit. |
| 0300 | The on-board computer (BC) has detected random or multiple misfires - in this case, the car may not start immediately. |
| 0301 — 0304 | Misfires were detected in the engine cylinders. |
| 0325 | The on-board computer detected an open circuit in the detonation device. |
| 0327, 0328 | The knock sensor is malfunctioning—the device needs to be replaced. |
| 0335, 0336 | A breakdown in the functioning of the crankshaft position sensor has been detected - it needs to be replaced. |
| 0342, 0343 | The car's BC has detected a failure of the phase sensor - the device needs to be replaced for optimal operation. |
| 0422 | The neutralizer device does not work. |
| 0443 — 0445 | The canister purge valve has stopped working - it needs to be replaced. |
| 0480 | The cooling fan has stopped working - the element needs to be replaced. |
| 0500, 0501 , 0503, 0504 | The car's BC has detected a malfunction in the speed sensor - the indicator needs to be changed. |
| 0505 — 0507 | There are malfunctions in the functioning of the idle speed controller, which affect the number of revolutions (lower or higher). If this code occurs, the regulators must be replaced. |
| 0560, 0562, 0563 | During diagnostics, the BC detected failures in the supply of mains voltage. A more thorough diagnosis is needed that will identify the exact areas in the circuit that need to be replaced. |
| 0607 | The detonation channel is not functioning. |
| 1115 | Failures in the operation of the oxygen sensor heating circuit were detected. |
| 1135 | An open circuit was observed in the heating circuit of the oxygen sensor; a short circuit may have occurred. It is better to replace the sensor. |
| 1171, 1172 | Incorrect potentiometer gas level. |
| 1500 | The BC detected an open circuit in the fuel pump device. |
| 1509 | The electrical control circuit for the idle control element is overloaded. |
| 1513, 1514 | The on-board computer detected an open circuit in the idle speed device. |
| 1541 | When this code appears, there is an open circuit in the fuel pump relay adjustment circuit. |
| 1570 | A break was detected in the traction control system. |
| 1600 | The BC reports that communication with the traction control system has been lost. |
| 1602 | It is one of the most common codes when diagnosing fault codes. Indicates a loss of on-board power supply voltage to the electronic control unit. |
| 1606, 1616, 1617 | During diagnostics, a breakdown of the uneven road surface detection device was identified. |
| 1612 | A fault was detected in the electronic unit reset. |
| 1620 | Problems with the permanent storage device. |
| 1621 | Failure of the random access memory device. |
| 1689 | If this combination of numbers appears during diagnostics, the on-board computer may show incorrect error codes. |
| 0337, 0338 | Errors in the functioning of the crankshaft position control element or an open circuit. |
| 0481 | The second cooling fan has stopped working - it needs to be replaced. |
| 0615 — 0617 | During the diagnostic process, breaks or short circuits in the starter relay circuit were identified. |
| 1141 | The heating device for the first oxygen sensor after the neutralizer has left the working row. |
| 230 | This error code means the fuel pump relay is broken - the device needs to be replaced as soon as possible. |
| 263, 266, 269, 272 | These codes indicate a breakdown of the driver of the first, second, third or fourth injectors - the elements need to be replaced. |
| 640 | This combination indicates an open circuit in the lamp circuit. |
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We have presented to your attention the most common combinations of codes found when diagnosing VAZ cars.
Causes of error P0343
The most common cause of P0343 is engine oil or moisture getting into the camshaft position sensor signal wire. Other reasons are:
- Camshaft position sensor malfunction
- Worn or damaged ground wire
- Worn or damaged power cord
- Starter motor malfunction
- Low or completely discharged battery
- PCM malfunction
Meaning and interpretation of error codes
To read the faults, first consider the list with a table of UEr errors that self-diagnosis produces (the author of the video is Ivan Vasilyevich).
| Number | Description |
| 1 | Problems with the functioning of the microprocessor. |
| 2 | Self-diagnosis of the VAZ 2114 detected problems with the electrical wiring of the fuel level indicator controller. The signal level coming from the sensor may be too high or low. It is necessary to test the controller and check the wiring. |
| 4 | Increased voltage in the on-board network. |
| 8 | Low voltage. What to do: in this and in the previous case, the battery and generator must be checked. |
| 12 | There is a problem with the diagnostic indicator circuit on the instrument panel. |
| 13 | The control unit cannot detect the signal coming from the oxygen controller. |
| 14 | An increased signal is received from the refrigerant temperature controller. |
| 15 | The problem is in the operation of the coolant temperature sensor (coolant temperature sensor) - the on-board computer records a reduced signal level. |
| 16 | There is increased voltage in the car wiring. |
| 17 | Reduced voltage in wiring. |
| 19 | Problems have been reported in the operation of the crankshaft position sensor (CPS). An incorrect signal is sent to the control unit. |
| 21 | Problems with the operation of the TPS controller (throttle position sensor). There may be problems with the throttle valve. Check the connection circuit and sensor. |
| 22 | A reduced signal is sent from the TPS. |
| 23 | The intake air temperature controller gives an increased signal. |
| 24 | There are problems with the speed controller. Its failure can be diagnosed by a non-working speedometer. |
| 25 | Reduced signal from the incoming air temperature controller. |
| 27,28 | Incorrect signal coming from the CO sensor. |
| 33,34 | Malfunctions of the mass air flow sensor (mass air flow sensor). Check the flow meter connection circuit and its functionality. |
| 35 | The ECU has detected a deviation in the idle speed values. The sensor may be faulty. |
| 41 | Incorrect pulse coming from the phase controller. |
| 42 | Problems with the electronic ignition wiring. |
| 43 | An incorrect pulse is supplied from the detonation controller. |
| 44,45 | Problems with the composition of the combustible mixture. It can be depleted or over-enriched. |
| 49 | Check for vacuum loss. |
| 51,52 | Problems in the functioning of the PROM or RAM. |
| 53 | There is no CO controller pulse. Open circuit or sensor failure. |
| 54 | No impulse is received from the octane corrector controller. |
| 55 | When the load on the power unit is reduced, the ECU detects depletion. |
| 61 | Problems with the oxygen controller. |
These codes can add up; if you see the number 6, this may indicate errors 2 and 4, or if the number 9 is displayed, errors 1 and 8.
In order to immediately read and decipher problems when diagnosing, it is advisable to download and always carry with you a printout with a description. When diagnosing using a computer, codes on engine 21124 may differ depending on the car model. To read the codes, you need to know how they are supposed to be deciphered. Errors must be reset after they have been deleted (the video was filmed and published by the KV Avtoservis channel).
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| Number | Decoding |
| p0102, p0103 | An incorrect pulse is supplied from the mass air flow sensor controller. This means you need to check the wiring. |
| p0112, p0113 | 112 or 113 - the incoming air temperature sensor needs to be replaced. |
| p0115-p0118 | Errors from 0115 to 0118 - the antifreeze controller sends an incorrect impulse. There may be problems with the wiring or the sensor itself. |
| p0122, p0123 | TPDZ. The controller is sending an incorrect signal. If the wiring is damaged, interference may occur. |
| p0130, p0131 | The lambda probe requires diagnostics and replacement. |
| p0135-p0138 | Error 0135 and higher - the lambda probe heating regulator needs to be replaced. |
| p0030 | The ECU reports problems in the electrical circuit in the area from the lambda probe heater to the converter. If error p0030 occurs, you need to test the electrical circuit and the sensors themselves. |
| p0036 | P0036 - a break in the wiring of the heating device DK-2 was detected. |
| p0300, p0302 | When codes 300 and 302 appear, the ECU reports a misfire. |
| p0301 | Gaps were detected in the cylinders of the power unit. Compression needs to be checked. |
| p0325 | The knock sensor is not working correctly. In particular, we are talking about a break in the connection wiring. |
| p0335, p0336 | P0036 error VAZ 2114 or 10335 - the DPKV has failed or its connection circuit is damaged. If the wiring is intact, then the sensor is replaced. |
| p0340 | Phase sensor malfunction. |
| p0341 | Error VAZ 2114 0341 means a problem with the camshaft controller. |
| p0342, p0343 | Problems with the phase controller. With such an error, detonation of the car engine is possible. Most likely, only replacement will solve the problem. |
| p0346 | P0346 VAZ error - also a problem with the phase regulator. |
| p0363 | P0363 - misfire of the combustible mixture was detected. In cylinders that refuse to work, the fuel supply is cut off. |
| p0422 | Failure to operate the neutralizing device. |
| p0443, p0444, p0445 | Malfunctions 0443, p0444 and 0445 - adsorber regulator, purge is not carried out. |
| p0480 | The engine cooling fan device has failed. The power unit may overheat if it is not replaced in a timely manner. Before replacing, you need to check the connection contacts to the wiring. |
| p0501-p0504 | Error 0501 VAZ 2114 and error code 0504 - the speed controller refuses to work. The device needs to be replaced. |
| p0505, p0506, p0507 | The idle speed sensor does not work or does not work correctly. Its failure can lead to floating idle speed. Possible engine tripping. The controller itself is tested and the wiring is checked. |
| p0607 | The knock controller operates intermittently. |
| p1135 | Error 1135 VAZ 2114 - you need to test the oxygen controller. |
| p6060 | Processor failure. If the fault remains after resetting the code, then the controller must be replaced. |
| p2020 | It is necessary to test the intake flap position sensor. |
| p1617 | Error 1617 - Rough road controller, wiring damage. |
| p1513 | There is a short circuit in the wiring of the idle speed sensor. It is necessary to test the electrical circuit and check the contacts. |
| p1602 | Failures in the voltage supply to the vehicle's electrical network are detected. |
| p0560 | Incorrect voltage level in the on-board network. This parameter can be overestimated or underestimated. The car battery, as well as the generator unit, are subject to testing. |
| p1514, p0511 | The appearance of these errors indicates a problem with a break or short circuit in the IAC (idle speed regulator) wiring. First of all, diagnose the sensor contacts, and then test the circuit, if possible. The sensor itself may also be damaged. |
| p1303 | P1303 - A detected misfire of the air-fuel mixture in the third cylinder is reported. The malfunction must be corrected as quickly as possible, since it can be critical for the neutralizer. |
| p1578 | Throttle valve malfunction. Literally, the problem stands for “zero adaptation parameter is outside the permissible value.” There are several options to solve the problem. The first thing you need to do is clean the throttle valve. If this does not help, then the throttle is adapted. To do this, you need to activate the ignition, and then start the engine after 40 seconds. Alternatively, you can test and tighten the contact terminals on the throttle. |
| p1621 | Malfunction of the RAM, memory problems in the control unit. Detailed testing of the computer is required. |
| p0650 | Problems in the control circuit of the on-board computer error code indicator State. |
| p2135 | P2135 - malfunction of the throttle assembly. If replacing the sensor and cleaning the damper did not help, then the problem may have to be solved by flashing the on-board computer. |
| p2187 | Lean mixture in internal combustion engine cylinders. You need to do a detailed diagnosis of the problem. |
How does a mechanic diagnose a P0343 code?
First, the mechanic will visually inspect the camshaft position sensor as well as its wires for any damage. If moisture or engine oil gets on the sensor or its wires, a mechanic will clean the necessary components using electrical contact cleaner or alcohol. It will then clear the error codes from the computer's memory and retest the system to see if P0343 appears again. If the error code appears again, the problem is most likely a problem with the sensor itself. The mechanic will check the sensor's operation using a multimeter and replace it if necessary. He will then clear the error code from the computer's memory again and test drive the vehicle to check the operation of the installed sensor.
How to fix the problem?
To fix the problem, you should reset the error and repeat the diagnostics after a couple of days. It is advisable to use an OBD2 scanner. If the code does not disappear, you should check the parts and assemblies of the “four” described above. Sometimes, to eliminate the malfunction, it is enough to clear the sensor of oil and clean the contacts. This procedure can be combined with replacing the timing belt and engine lubricant. In this case, it is useful to eliminate the reason for its contact with an electrical component. If the sensor fails, it should be replaced. Broken or damaged wiring must be repaired. To restore the battery's charge, sometimes it is enough to charge it well with a charger and clean the terminals, but you may need to buy a new battery or repair the generator if the problem is in it.
The ECU, if broken, must be replaced. This is one of the most unpleasant and expensive breakdowns associated with this error. Fortunately, it is rare.
SYMPTOMS AND INSPECTION
Signs of a malfunctioning camshaft sensor, by which you can determine that the device has failed, are as follows:
- Increased fuel consumption;
- Problems in the vehicle self-diagnosis mode;
- Reduced acceleration dynamics;
- The “Check Engine” sign or errors 0343 or 0340 appear on the dashboard.
The “Check Engine” icon, as a rule, lights up when the DF is completely out of order. The following happens: you turn on the ignition, after which the starter starts working, at this time the ECU unit should receive a signal from the sensor, but since the DF is broken, it is not there, and the electronic control switches the engine to twin injection mode (based solely on the data received from the DKPV ), turning off the phased injection of the fuel mixture.
If you find any signs of malfunction, you need to check the DF. You can do this yourself; you only need a tester (multimeter), which can be purchased at any car store for 400-600 rubles. The device is inexpensive, but useful - you will need it several times when diagnosing a car.
On fourteenths with a 16-valve engine, DF models 21120-3706040 are installed, on 8-valve engines - 21110-3706040. Checking each of them has some features.
- On the multimeter probe (V1 mode), which will be connected to contact “E” on the sensor, set the voltage to 13.5 V, on the second probe (connect to contact “B”) - 0.9 V;
- We close the probes on the corresponding contacts. We bring a metal plate to the end part of the DF (a screwdriver will do). If the device is working normally, the multimeter will show that the voltage at pin “B” has dropped to 0.4 V (should return to 0.9 when the plate is removed). Differences in readings – the sensor needs to be replaced.
Checking the DF of a 16-valve engine:
- We switch the tester to V2 mode. On the probe of contact “E” we set the voltage to 13.5 V, on contact “B” - 0.4 V;
- Insert a screwdriver into the hole at the end of the DF housing. When the sensor is working, the voltage at contact “B” will increase to 0.9 W and drop back if the screwdriver is removed.
Additional comments for troubleshooting P0342
The camshaft position sensor is an integral part of the system that allows the vehicle to operate reliably, smoothly and quietly. If the sensor does not operate properly, symptoms will occur indicating a problem. If the problem is not solved for a long time, it can lead to more serious problems. Therefore, if a P0342 error is detected, it is recommended that you contact a qualified technician as soon as possible to diagnose and resolve the error.
It should also be noted that if this error code is stored in the PCM and the Check Engine Light illuminates, the vehicle will most likely fail an emissions test.
