Posts Tagged: knock sensor
Test a Knock Sensor: Step-by-Step Guide
Test a knock sensor yourself If you have a check engine light and a knock sensor code, the cause can be a bad knock sensor, or an issue with the knock sensor wiring or electrical connector. You can test the knock sensor yourself. Start by checking the condition of the wiring harness and electrical connector. Feel the wire for signs of an open, or rodent damage. Remove the connector from the sensor and check for corrosion. If the wiring looks good, move on to the bias voltage test Test the … Read More
Chevrolet P0325
Diagnose and fix Chevrolet P0325 A Chevrolet P0325 refers to the engine knock sensor. The computer uses signals from the knock sensor to adjust engine timing to reduce detonation. A P0325 is defined as a problem with the Knock Sensor Circuit. Test a knock sensor on a Chevrolet On a late model Chevrolet, start by checking the knock sensor connector for damage. Next, open the connector and check for signs of corrosion. If the connector is in good shape with no corrosion, conduct the following tests. Using a digital multimeter, … Read More
How a knock sensor works
What a knock sensor does and why it’s so important A knock sensor receives a quick bias voltage from the ECM at startup, but that’s just to test the integrity of the connection. From that point on, the sensor doesn’t require any voltage. Here’s how a knock sensor works. There’s a piezoelectric crystal inside the sensor that generates an AC voltage when it’s compressed by engine vibrations. The vibrations occur if the engine encounters preignition or detonation. So, a knock sensor is really kinda of a microphone that allows the ECM … Read More