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How To Test And Repair Camshaft Position Sensor - Self Checking

How To Test And Repair Camshaft Position Sensor - Self Checking

October 26 , 2023 0

The cam sensor, also known as the cam position sensor, is a positioning sensing device for cylinder discrimination, and what effect does a bad camshaft sensor have on the car, which can lead to misfiring, making it more difficult to start the engine, or the ECU is unable to obtain the information fed back from the sensor, leading to abnormal control of the engine intake and exhaust system and affecting its performance. In addition, a damaged camshaft sensor can also make the car crankshaft reverse when starting, leading to intake manifold backfire problems. Also the inability of the ECU to get information can lead to problems with uncontrolled injection, which can lead to an increase in fuel consumption. The vehicle may also experience severe shuddering, similar to a vehicle out of cylinder working condition. Generally when the camshaft sensor malfunctions, the engine malfunction light will be detected, thus the malfunction indicator light on the vehicle dashboard will light up, reminding the owner to carry out timely inspection and repair of the vehicle. In the case of the normal state of the device, the role of the camshaft sensor can be based on the operation of the cylinder, into the ECU electronic control unit, so as to use the information to carry out sequential injection control, ignition moment control and deflagration control. In addition, the camshaft sensor can act as an emergency ignition in the event of a crankshaft sensor failure.

Common Reasons For Camshaft Position Sensor Failure

How To Detect If The Camshaft Position Sensor Is Faulty

One method is to use a multimeter resistance check sensor 1 terminal and ECU 62 terminal, sensor 2 terminal and ECU 76 terminal, sensor 3 terminal and ECU 67 terminal resistance value, under normal circumstances, the resistance value will not be more than 1.5 ohms, if too large or infinity is the sensor is faulty, the need for repair and replacement. Another method is to use an oscilloscope to measure the signal waveform between the signal output of the magneto-electric camshaft position sensor and the iron end when the engine is running, and the waveform on the oscilloscope should be sinusoidal, with an amplitude between 0 and 5V. The amplitude of the waveform will not change, only the waveform frequency will increase with the increase in engine speed. There is another method is to disconnect the ignition switch, press the sensor wire connector plug, with a multimeter positive, negative meter were connected to the connection 1 and 3 terminals, turn on the ignition switch, the voltage should be 4.5V or more. If the voltage is zero, the wiring harness is broken, short circuit. Or the ECU is faulty; when disconnecting the ignition switch, you should continue to detect whether there is a break or short circuit in the wires. The function of the camshaft sensor is that it can be transmitted to the ECU electronic control unit according to the operation of the cylinders, so as to carry out sequential injection control, ignition moment control and deflagration control. If the vehicle appears to ignition does not work, idle speed is not stable, the car shaking, acceleration is weak, fuel consumption increases, the fault light continues to light up and other phenomena, it also indicates that the camshaft sensor is faulty.

How to Test, Two Wire Sensors

If you have a two-wire magnetic sensor, set your multimeter to "AC Voltage".
Have an assistant turn on the ignition key without starting the engine.
Check to see if current is flowing through the circuit. Ground one of your probes and connect the other probe to each sensor wire. If there is no current flowing through both wires, the sensor circuit is faulty.
Have your helper try to turn on the ignition or start the engine.
Touch one of your gauge probes to one of the sensor wires and the other to the other wire. Check your gauge display and compare your readings to your manual specifications. In most cases, you will see a fluctuating signal between 0.3 and 1 volt.
If there is no signal, you have a bad sensor

How to Test, Three Wire Sensors

First, use your vehicle's service manual to identify the power, ground, and signal wires. Next, test the sensor circuit by setting your multimeter to "DC Voltage".
Have your helper turn on the ignition key, but do not start the engine.
Touch the black probe on the meter to the earth wire and the other probe to the power wire. This is usually 10 to 12v
Have your helper start or start the engine.
Touch the signal wire with the red probe on the meter and the earth wire with the black probe. It will typically vary between 0 and 5v. If the voltage signal is below spec, it's likely a bad sensor. If there is no signal output from the sensor, it is most likely a bad sensor. Remove the sensor and inspect for signs of physical damage or contamination

If you don't notice any problems with the crankshaft or camshaft position sensors or their circuits, you may experience intermittent malfunctions or failures in related components. For example, your timing belt or timing belt tensioner may be weak or overstretched. It needs to be adjusted or replaced promptly .