With the ignition off, disconnect the engine management system wiring harness connector from the crankshaft position sensor.
We connect the tester probes to the terminals "2" and "3" of the block of the wiring harness. With the ignition on and the crankshaft stationary..
... the tester should detect a voltage of about 2.5 V.
A similar voltage should be between terminals "1" and "3" of the wiring harness block.
If the voltage values do not correspond to the norm, we check the health of the circuit between the terminal "3" of the block and the "ground", as well as between the terminal "1" of the block and the output "M21" of the block of the ECU harness (terminal "2" of the block and terminal "M5" of the block of the ECU harness).
If the voltage values \u200b\u200band serviceable circuits do not match, the electronic control unit is faulty.
To check the sensor, remove it.
By connecting the probes of the tester to the terminals "1" and "2" of the sensor, we measure the resistance of its winding. It should be equal to 500-600 ohms.
We switch the tester to the AC voltage measurement mode..
... and several times we bring a steel rod to the end of the sensor.
With a working crankshaft position sensor, the device should detect power surges.
Replace the defective sensor with a new one.