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Home >> Hyundai >> 2003 >> Elantra GLS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0325: Knock Sensor 1 Circuit Malfunction >> Inspection/Repair >> Component Inspection

Component Inspection

  1. Component resistance 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 Sensor Connector (Component Side)
      G07331206
  2. Output signal inspection.
    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 1 (-): terminal 2.

    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.

  3. Installation torque inspection.
    1. Check the installation torque of the knock sensor.

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

  4. Has a problem been found?

    YES

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

    NO

    • Check for poor connection between PCM 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.
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