Inspection Procedures

PROBLEM VERIFICATION
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 .
CHECK ECTS AND ECM CONNECTORS
1. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Are both connectors good?

Yes: Go to next

No: Repair or replace it.
CHECK ECTS RESISTANCE
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.
CHECK POWER TO 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.
CHECK FOR SHORT TO GROUND IN HARNESS
1. Turn ignition switch to OFF position.
2. Disconnect ECM connector.
3. Check for short in harness between terminals 1 and 3 of the ECTS harness connector.
4. Check for short to ground in harness between terminal 1 of the ECTS harness connector and chassis ground.
Fig 3: Checking For Short To Ground In Harness Between Terminal 1 Of ECTS Harness Connector & Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
- Specification: Open loop
  Does resistance indicate open?
Yes: Proceed with ECM PROBLEM PROCEDURE .

No: Repair short to chassis ground in harness.