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HOMESERVICE MANUALSHYUNDAI2003ELANTRA L4-2.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSKNOCK SENSORTESTING AND INSPECTION
2003 Hyundai Elantra L4-2.0L

Knock Sensor: Testing and Inspection

2003 Hyundai Elantra L4-2.0LSECTION Testing and Inspection



KNOCK SENSOR
The knock sensor is attached to the side of the cylinder block to sense engine knocking. A knocking vibration from the cylinder block is applied as pressure to the piezoelectric element This vibrational pressure is then converted into a voltage signal which is relayed to the ECM. If engine knocking occurs, ignition timing is retarded to suppress it.

Circuit Diagram:






HARNESS INSPECTION PROCEDURE

SENSOR INSPECTION
1. Disconnect the knock sensor connector and measure resistance between terminals 1 and 2

Standard value : about 5 MOhm [at 20 ° (68 °F)]

2. If the resistance is continuous, replace the knock sensor.

Tightening torque
knock sensor: 16 - 25 N.m (160 - 240 kg.cm, 11.8 - 18.4 lb.ft)




3. Measure the capacitance between terminals 1 and 2

Standard value : 800 - 1600 pF
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.