Knock Sensor (Prizm GSi)
- To check knock sensor resistance, use ohmmeter and measure resistance between sensor terminal and engine block. Knock sensor is located on rear of engine block and has a Black wire connector. Replace sensor if resistance is not 3300-4500 ohms.
- To check knock sensor operation, remove connector from knock sensor. Connect voltmeter between sensor terminal and ground. Adjust voltmeter to 200 millivolts on AC scale.
- Tap on engine block near knock sensor and note reading. Replace knock sensor if no reading is obtained.