Control Circuit Inspection

■ Check voltage 

1. IG "OFF" and disconnect IDB connector.
2. Connect the probe to High/Low side of the injector circuit and select the oscilloscope in the menu.
3. IG "ON".
4. Check the voltage between injector control terminal of the IDB and chassis ground.

   Specification:  approx. 3.5V

   Fig 1: Checking Voltage Between Injector Control Terminal Of IDB And Chassis Ground

   Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured voltage within specification?

   YES 

   • Substitute with a known - good IDB and check for proper operation. If the problem is corrected, replace IDB and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Repair open or short in injector control circuit between IDB and PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.