How to Measure the Crankshaft Position Sensor?
2 Answers
The measurement method for the crankshaft position sensor: 1. The engine's speed signal comes from the crankshaft position sensor. If the sensor does not output a signal, the engine tachometer will definitely not move; 2. Connect the two probes of the multimeter to the two signal wires of the magnetic crankshaft position sensor. Set the multimeter to the 20V range at idle speed. The higher the measured voltage, the higher the speed; 3. Adjust the oscilloscope voltage to 14V and the time to 10mS, then start the vehicle to see the AC signal waveform; 4. Use a decoder to read the engine speed data stream.
As someone who frequently tinkers with cars, when my car wouldn't start last time, I tested the crankshaft position sensor. It's usually located near the crankshaft at the front of the engine. First, I disconnected the negative battery terminal for safety, then used the ohmmeter function of a multimeter to measure the sensor pins. Normal values are typically between 400-2000 ohms. If the reading is outside this range or shows infinity, the sensor might be burnt out. You can also use the voltage function: after turning on the ignition, connect the multimeter to the signal wire - it should show a fluctuating voltage of about 1-5 volts. Remember not to touch hot components as they can burn your hands. If the readings are abnormal after testing, you'll need to replace the sensor. I recommend trying the resistance test first as it's simple and quick. If you're unsure, consult the manual or visit a repair shop to avoid damaging more parts. These steps are quite basic but can save you unnecessary expenses.
