Signal Circuit Inspection

Check for open in harness
1. Ignition "OFF"
2. Disconnect Fuel sender connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 1 of sensor harness connector and chassis ground.
  Specification: approximately 12V
  
  Fig 1: Measuring Voltage Between Terminal 1 Of Sensor Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure voltage within Specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure
  NO
  - Open circuit or short circuit to chassis ground between Fuel sender harness connector and PCM connector.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NOTE:
  In case, when the Fuel sender connector is disconnected, the voltage of Fuel sender terminal 1 is 0 V.
  - Possible cause: Open or short between terminal 21 of PCM and terminal 1 of Fuel sender.