1. Connect a test lamp or ohmmeter to the incoming and outgoing wire of the sensor. To do this, disconnect the wires from the sensor.
Attention! The sensor screwed into the cylinder block usually does not have a ground wire.
2. When the sensor is triggered, the resistance is zero. Otherwise, the resistance is infinite.
3. You can quickly check the operation of the coolant and brake fluid level sensors if, with the ignition on, you disconnect the power supply wire from the sensor and attach it to ground. If the control lamp on the instrument panel lights up, the sensor is faulty. A special case is the oil pressure sensor: when the engine is not running, the sensor is triggered (the control light is on) and only at a certain oil pressure the sensor switches off.
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