Inspection Procedures

1. Connect a Hi-Scan (Pro) to the data link connector.
2. Start the engine and monitor the ECTS signals while warming up engine to normal operating temperature.

   Scanned temperature on the Hi-Scan (Pro) should be close to actual engine coolant temperature, is it? 

No: Go to next

Yes: Problem is intermittent or was repaired and engine control module memory was not cleared. Proceed with INTERMITTENT PROBLEM PROCEDURE  .

1. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

   Are all connectors good? 

Yes: Go to next

No: Repair or replace it.

1. Turn ignition switch to OFF position.
2. Check resistance of ECTS between terminals 1 and 3 of the ECTS connector.

Fig 1: Checking Resistance Of ECTS Between Terminals 1 & 3 Of ECTS Connector

Courtesy of HYUNDAI MOTOR CO.

• Refer to  SPECIFICATIONS   for more information. 

Is resistance within specification? 

Yes: Go to next

No: Replace ECTS.

1. Turn ignition switch to OFF position and disconnect ECTS connector.
2. Turn ignition switch to ON position.
3. Measure voltage of ECTS signal harness between terminal 1 of the ECTS harness connector and chassis ground.

Fig 2: Measuring Voltage Of ECTS Signal Harness Between Terminal 1 Of ECTS Harness Connector & Chassis Ground

Courtesy of HYUNDAI MOTOR CO.

• Specification: approximately 5V 

  Is voltage within specification? 

Yes: Go to next

No: Repair open or short to chassis ground in harness.

1. Turn ignition switch to OFF position.
2. Disconnect ECM connector.
3. Check for open in signal harness between terminal 1 of the ECTS harness connector and terminal 31 of the ECM harness connector.

Fig 3: Checking For Open In Signal Harness Between Terminal 1 Of ECTS Harness Connector & Terminal 31 Of ECM Harness Connector

Courtesy of HYUNDAI MOTOR CO.

• Specifications: below 1ohm 

  Does resistance indicate continuity? 

Yes: Go to next

No: Repair open in harness.

1. Check for open in ground harness between terminal 3 of the ECTS harness connector and terminal 73 of the ECM harness connector.

Fig 4: Checking For Open In Ground Harness Between Terminal 3 Of ECTS Harness Connector & Terminal 73 Of ECM Harness Connector

Courtesy of HYUNDAI MOTOR CO.

• Specification: below 1ohm 

  Does each resistance indicate continuity? 

Yes: Go to next

No: Repair open in harness.

1. Turn ignition switch to ON position.
2. Check for short to power in signal harness between terminal 1 of the ECTS harness connector and chassis ground.

Fig 5: Checking For Short To Power In Signal Harness Between Terminal 1 Of ECTS Harness Connector & Chassis Ground

Courtesy of HYUNDAI MOTOR CO.

• Specifications: below 0.5V 

  Is voltage within specification? 

Yes: Proceed with ECM PROBLEM PROCEDURE  .

No: Repair short to power in harness.