Camshaft position sensor failure with engine failure light on
The camshaft position sensor is a sensing device, also called a synchronization signal sensor. It is a cylinder discriminating and positioning device that inputs the camshaft position signal to the ECU and is the main control model for ignition control. The purpose of the camshaft position sensor is to collect the position signal of the valve camshaft and input it into the ECU so that the ECU can identify the top dead center of the cylinder to perform sequential fuel injection control, ignition timing control and deflagration control. In addition, the camshaft position signal is also used to identify the moment of the first ignition when the engine is started. Because the camshaft position sensor can recognize which cylinder piston is about to reach the top dead center, it is called a cylinder recognition sensor.
According to the working principle, the camshaft position sensor can be divided into three types: electromagnetic type, Hall type, and magnetoresistive element type.
Common phenomenon of camshaft position sensor failure
Engine failure light is on, vehicle does not ignite, fuel is weak, engine power drops , Fuel consumption increase, engine knock, etc.
Common failures of camshaft position sensor
Camshaft position sensor function failure, camshaft position sensor sensor unreliable signal , The camshaft position sensor has no signal, the camshaft position sensor sensor signal is too small, the camshaft position sensor sensor is electrically faulty, the camshaft position sensor sensor is short-circuited to the positive electrode, etc.
According to the fault analysis of the fault point, the general fault points are, the camshaft position sensor circuit failure, the camshaft position sensor failure, the gas distribution phase is incorrect, and the camshaft signal plate is damaged Or there may be foreign objects.
Camshaft position sensor failure detection
1. Alternative method, install a normal camshaft position sensor experiment, read the fault code to see if it exists, if there is no camshaft position sensor failure , If the fault still exists, continue to the next step.
2. Camshaft position sensor circuit failure check
Multimeter resistance detection, sensor temperature is 10~50℃ in cold state, camshaft position sensor resistance is 835~1400Ω, hot state When the temperature of the sensor is 50~100℃, the resistance of the camshaft position sensor is 1060~1645Ω.
Check the decoder and use the computer diagnostic tester to test. If the camshaft position sensor is damaged or the related circuit fails, the fault code P0340 or flash code 14 will appear. The cause may be the camshaft position sensor failure , The camshaft position sensor circuit is open or shorted or the ECU is faulty.
Disconnect the ignition switch, disconnect the camshaft position sensor, turn on the ignition switch, and measure the ground voltage and resistance of the 3 terminals of the connector power terminal. The ground voltage of 1 and the ground is 4.8V~5.2V ; 2 and the ground voltage is 12V; 3 and the ground resistance is less than 1Ω.
3. Check whether the gas distribution phase is installed correctly according to the maintenance manual.
4. Check whether the camshaft signal plate is damaged or has foreign matter.
5. Visually check whether the sensor is damaged, whether the circuit is damaged or ablated, etc.
The emergence of automobile fault codes comes from the failure of the accessory itself on the one hand, and from other related accessories on the other hand. The problem must be gradually eliminated and finally solved.
After the above introduction, do you all understand? The above is the explanation of the camshaft position sensor failure. I hope you can use it for reference. The above summary is for your reference only.
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