Signal Circuit Inspection

The inspection of ECTS signal line is for finding whether there is a open or short circuit in harness.

Check for open in harness
1. Ignition "OFF"
2. Disconnect ETC sensor 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 power in harness" below.
  NO
  - In case over 5V: Short circuit to battery between ECTS harness connector and PCM harness connector.
  - In case 0V: Open circuit between ECTS harness connector and PCM harness connector.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
    NOTE:
    In case, when ECTS connector is disconnected, the voltage at terminal 1 is 0V.
    
    Possible cause: Open or short between Terminal 1 of ETCS connector and terminal 39 of PCM.
Check for short to power in harness
1. Ignition "OFF"
2. Disconnect ECT sensor connector and PCM connector.
3. Ignition "ON" & Engine "OFF"
4. Measure resistance between terminal 1 and 3 of sensor harness connector.
  Specification: infinite
  
  Fig 2: Measuring Resistance Between Terminal 1 And 3 Of Sensor Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
5. Is measure resistance within Specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Short circuit between cluster signal circuit and ECTS signal circuit.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure