Control Circuit Inspection

Check for open in harness
1. Ignition "OFF"
2. Disconnect ISCA connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 1, 3 of sensor harness connector and chassis ground.
  Specification: approximately 3.6V
  
  Fig 1: Measuring Voltage Between Terminal 1, 3 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 or Short circuit to chassis ground between ISCA harness connector and PCM harness connector.
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect ISCA connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 1, 3 of sensor harness connector and chassis ground.
  Specification: infinite
  
  Fig 2: Measuring Resistance Between Terminal 1, 3 Of Sensor Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "Check for short between open coil and close coil harness" below.
  NO
  - Short circuit to chassis ground between ISCA harness connector and PCM harness connector.
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short between open coil and close coil harness
1. Ignition "OFF"
2. Disconnect ISCA connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 1, 3 of sensor harness connector.
  Specification: infinite
  
  Fig 3: Measuring Resistance Between Terminal 1, 3 Of Sensor Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Shorted circuit between ISCA open signal circuit and close signal circuit.
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.