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 5V
  
  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 "Check for short to ground in harness" below.
  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 3 is 0 V.
  - Possible cause: Open or short between terminal 21 of PCM and terminal 3 of Fuel sender.
Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect Fuel sender connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 1 and 3 of Fuel sender harness connector.
  Specification: infinite
  
  Fig 2: Measuring Resistance Between Terminal 1 And 3 Of Fuel Sender Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Short circuit to ground between Fuel sender harness connector and sender signal circuit.
  - 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 3 is 0 V.
  - Possible cause: Open or short between terminal 21 of PCM and terminal 3 of Fuel sender.