Principle and maintenance of camshaft position sensor

Everyone knows that the camshaft is an important part of the car. As technology advances. The camshaft position sensor came into being. The camshaft position sensor is one of the most important sensors in the control system. It is usually installed in the distributor. It is similar to the crankshaft position sensor introduced before, but it is not exactly the same.

Camshaft position sensor fault diagnosis and troubleshooting methods 1. Check high-voltage sparks Pull out the high-voltage wires of each sub-cylinder to test the cylinder body, and check the high-voltage sparks The strength of each cylinder is normal, and the high-pressure spark of each cylinder is normal. 2. Check the spark plug The normal gap of the spark plug is generally 0.8mm, and the spark plug gap of the high-energy electronic ignition system is larger, up to 1.2mm. After checking the gap of each spark plug is normal. 3. Check the air filter to clean the filter screen of the air filter, and check whether the filter screen is damaged. 4. Check whether the intake system is leaking. Check whether the intake hose behind the air flow meter is broken. 5. Check the fuel pressure. Install the fuel pressure gauge and start the engine to check the fuel pressure. The fuel pressure is 250kpa. Unplug the fuel pressure regulator vacuum tube. The pressure is 300kpa (normal range 270-310kpa). Turn off the engine and the pressure is also maintained at 150kpa. , Indicating that there is no problem with fuel. 6. Check the cylinder pressure Use a cylinder pressure gauge to check the pressure of each cylinder. 7. Check the ignition timing with a timing gun, and the ignition advance angle is normal.

The difference between the camshaft position sensor and the crankshaft position sensor The structure and work of the camshaft position sensor and the crankshaft position sensor The principle is basically the same, and they are usually installed together, except that the installation position of each model is different, but it must be installed at a position with a precise transmission relationship with the crankshaft, such as the crankshaft, camshaft, flywheel or distributor. The ECU of the electronic fuel injection system using only the crankshaft sensor has a special program to distinguish the ignition sequence to distinguish the cylinder ignition sequence. It is different from the method of using two sensors, which means that the popular point is 'counting'1-3-4-2'. Therefore, the program can distinguish different ignition cylinders at the same crankshaft angle by 'countingBut this is just a simple theory, the actual situation should take into account other factors, such as: timing (including variable timing), lift (including variable lift), ignition advance, intake and exhaust overlap and so on.

Camshaft position sensor detection method When the camshaft position sensor is faulty and the signal is interrupted, the diagnostic instrument can detect the fault information, thereby showing the camshaft position sensor failure. It includes two detection methods: 1. Detection of the sensor power supply voltage. Turn off the ignition switch, press the sensor wire connector plug, and connect the positive and negative meters of the multimeter to the terminals 1 and 3 respectively. When the ignition switch is turned on, the voltage Should be 4.5V or more. If the voltage is zero, it means that the wiring harness is broken or short-circuited. Or the ECU is malfunctioning; after turning off the ignition switch, continue to detect whether the wire is open or short-circuited. 2. Use a multimeter to check the resistance of the resistance of the wire resistance between the 1 terminal of the sensor and the 62 terminal of the ECU, the 2 terminal of the sensor and the 76 terminal of the ECU, the 3 terminal of the sensor and the 67 terminal of the ECU. The resistance between the wires should be Not more than 1.5 ohms. If the resistance is too large or infinite, it means that the wiring harness is in poor contact or the wire is broken, and the wiring harness should be repaired or replaced.

What is a camshaft position sensor? A camshaft position sensor is also called a synchronization signal sensor. It is a cylinder discriminating and positioning device that inputs the camshaft to the ECU The position signal is the main control signal for ignition control. The working principle of camshaft position sensor A straight shaft is generally equipped with many cams. The straight shaft is connected with the equipment to be tested through mechanical transmission, and will move in a certain position on the circumference with the rotation of the equipment. The Engine Camshaft For Mercedes Benz will be placed on top of the mechanical contact at the required position, and let it open or close to give a signal to control the device.

Camshaft position sensor function

The function of the camshaft position sensor is to collect the position signal of the valve camshaft, and Enter the ECU so that the ECU recognizes the top dead center of cylinder 1 to perform sequential injection control, ignition timing control, and knock control.

In addition, the camshaft position signal is also used to identify the timing of the secondary 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. The advantages and disadvantages of the camshaft position sensor: it can achieve high speed, compact structure and high reliability. Disadvantages: immutability, the action time cannot be changed.

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