Crankshaft Position Sensor Monitoring Method?
3 Answers
Crankshaft position sensor testing method: Unplug its wiring connector, use a multimeter to measure the resistance between each terminal on the sensor. The readings should comply with the values specified in the attached table; otherwise, the sensor should be replaced. Unplug the crankshaft position sensor's wiring connector. When the engine is rotated, there should be pulse signal outputs between the G1, G2, and G terminals. If there is no pulse signal output, the sensor needs to be replaced. More relevant information is as follows: 1. Inspection of the crankshaft position and angle sensor. Use the DC voltage setting of a multimeter to measure the power supply voltage of the crankshaft position and angle sensor; the normal value should be 12V. Use the DC voltage setting of a multimeter to measure the output signal voltage of the sensor during startup. The crankshaft position signal voltage should be 0.8~0.9V, and the crankshaft angle signal voltage should be 2~3V. 2. Measuring the Hall sensor output voltage. Turn off the ignition switch, open the distributor cap, pull out the central high-voltage line on the distributor cap and ground it, remove the rubber sleeve from the ignition connector plug, but keep the connector plugged in. Connect the voltmeter probes to terminals 3 and 6, turn on the ignition switch, rotate the engine in the direction of engine rotation, and observe that the voltmeter reading should vary between 0~7V. Additionally, the voltage should change 4 times for every two rotations of the crankshaft. Otherwise, it indicates a fault in the Hall effect generator, which should be replaced.
Checking the crankshaft position sensor is crucial, and I often do it myself. First, plug the diagnostic scanner into the OBD port to read trouble codes like P0335. If it appears, it may indicate a sensor issue. Then, observe the RPM signal in the live data stream—it should fluctuate steadily. If it's unstable or zero, further testing of the sensor's output voltage is needed. Use a multimeter to measure the AC signal, which typically varies between 0.5V and 5V. Without tools, remove the sensor to check for looseness or dirt in the mounting position, and clean the connectors to prevent oxidation. A worn-out sensor can cause hard starts or engine shaking. I've also found wiring damage to be common during repairs, so regular inspections can prevent breakdowns on the road.
Last time my car had acceleration issues, the mechanic taught me how to monitor the crankshaft position sensor with simple methods. Start the engine - if the RPM fluctuates noticeably, you can roughly diagnose it by listening. Connect a Bluetooth OBD adapter to a phone app and check if the crankshaft signal data is consistent; intermittent signals may indicate sensor failure. Without a scanner, manually measure: locate the sensor connector, unplug it, then use a multimeter to test voltage across three wires - the power wire should show 12V, while the signal wire should vary with RPM. Sensor dust accumulation is a common issue - after cleaning, my car ran much smoother. For prevention, regularly inspect wiring for aging.
