The position of the crown camshaft position A actuator circuit group 1 can be found in the related manual. Camshaft position sensor is a kind of sensing device, also called synchronous signal sensor. This is a cylinder identification and positioning device. Camshaft position signal input to ECU is the main control signal of ignition control. The methods to measure the quality of the camshaft position sensor are: 1, the camshaft sensor is generally a three-wire Hall sensor, the power line 12v or 5v, the signal line and the ground line; 2. Pull out the plug key and open the second gear. Measure with a voltmeter to confirm that the power cord has voltage output. Use the instrument to determine the ground wire. Use a voltage block. One rice stick is connected to the determined power line, and the other rice stick is connected to the other two lines. The measured voltage is the ground wire, and the rest is the signal wire. 3. At this time, turn off the key lead-out signal wire, plug it back in and start the engine to measure the signal wire and ground wire to see if there is signal voltage. The output voltage should be lower than the power supply voltage. If no signal voltage comes out, the sensor is broken.