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Sensor Inspection

Disconnect the knock sensor connector and measure resistance between terminals 1 and 2.
Standard value : about 5MΩ [at 20°C (68°F)]
If the resistance is continuous, replace the knock sensor.
Tightening torque

Knock sensor:

16~25 Nm (160~250 kg.cm, 12~18 lb.ft)
Measure the capacitance between terminals 1 and 2.
Standard value : 800~1600 pF

Fig 1: Measuring Capacitance Between Terminals 1 And 2
Courtesy of HYUNDAI MOTOR CO.