With the ignition off, disconnect the engine management system wiring harness connector from the crankshaft position sensor.
We connect the tester probes to terminals "2" and "3" of the wiring harness block. With the ignition on and the crankshaft stationary..
…the tester should record a voltage of about 2.5 V.
There should be a similar voltage between terminals "1" and "3" of the wiring harness connector.
If the voltage values are not within the norm, we check the serviceability of the circuit between terminal "3" of the connector and "ground", as well as between terminal "1" of the connector and terminal "M21" of the ECU harness connector (terminal "2" of the connector and terminal "M5" of the ECU harness connector).
If the voltage values do not match the serviceable circuits, the electronic control unit is faulty.
To check the sensor, we remove it.
By connecting the tester probes to the terminals "1" and "2" of the sensor, we measure the resistance of its winding. It should be equal to 500–600 Ohm.
Switch the tester to the AC voltage measurement mode..
…and we bring a steel rod to the end of the sensor several times.
If the crankshaft position sensor is in good working order, the device should record voltage surges.
We replace the faulty sensor with a new one.
The material was created based on information from the website: «chevyman.ru»