Component Inspection

1. Ignition "OFF"
2. Disconnect knock sensor connector
3. Measure resistance between terminals 1 and 2 of the sensor connector (Component side).

   Specification: Approx. 5^MΩ at 20°C (68°F).

   Fig 1: Measuring Resistance Between Terminals 1 And 2 Of The Sensor Connector (Component Side)

   Courtesy of HYUNDAI MOTOR CO.

1. Remove knock sensor from vehicle and secure (across mounting boss) in a shop vise.
2. Set up an oscilloscope as follows:

   Channel A (+): terminal 2 (-): terminal 1.

3. Rap on vise with a ball peen hammer while monitoring oscilloscope screen (there should be a spike of less than 1 volt with each hammer strike).

   Specification: knock sensor send a voltage spike with hammer strikes.

1. Check the installation torque of the knock sensor.

   Specification: Approx. 16 ~ 28N.m (160~250 kg.cm, 11.8~18.4 lb.ft)

YES 

• Check knock sensor for contamination, deterioration, or damage. Substitute with a known-good knock sensor and check for proper operation. If the problem is corrected, replace knock sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

NO 

• Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.