Using Stethoscope And Voltmeter

Operation Sound Check

1. Using a stethoscope, check the injectors for a clicking sound at idle. Check that the sound is produced at shorter intervals as the engine speed increases.
   NOTE: Ensure that the sound from an adjacent injector is not being transmitted along the delivery pipe to an inoperative injector.
   Fig 1: Checking Injector With Stethoscope

   Courtesy of HYUNDAI MOTOR CO.
2. If a stethoscope is not available, check the injector operation with your finger. If no vibration is felt, check the wiring connector, injector or injection signal from the PCM.
   Fig 2: Checking Injector With Finger

   Courtesy of HYUNDAI MOTOR CO.

   Resistance Measurement Between Terminals

3. Disconnect the connector at the injector.
4. Measure the resistance between terminals.

   Standard value: 13~16Ω (at 20°C (68°F))

5. Re-connect the connector to the injector.
   Fig 3: Checking Injector With Voltmeter

   Courtesy of HYUNDAI MOTOR CO.