Component Inspection

Check ECTS.

Ignition "OFF".
Disconnect ECT sensor connector.

Measure resistance between terminals "1" and "3" of the ECT sensor connector.

Specification: (error range is 2~3%.)

ECT SENSOR SPECIFICATIONS

Temperature (°C/°F)	0 (32°F)	20 (68°F)	40 (104°F)	80 (176°F)
Resistance (kΩ)	5.9	2.5	1.1	0.3
Voltage (V)	3.4~3.6	2.5~2.7	1.5~1.7	0.5~0.7

Fig 1: Measuring Resistance Between Terminals 1 And 3 Of ECT Sensor Connector

G07347430

Is the measured resistance within specifications?
YES
- Go to " 2 Check ECM" as below.
NO
- Check ECT sensor for contamination, deterioration, or damage. Substitute with a known-good ECT sensor and check for proper operation. If the problem is corrected, replace ECT sensor and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Check ECM.
1. Ignition "OFF".
2. Connect Scantool and Ignition "ON" & Engine "OFF".
3. Select simulation function on scantool.
4. Simulate voltage at terminal "1" of ECT sensor signal connector.
  
  Fig 2: Simulating Voltage At Terminal 1 Of ECT Sensor Signal Connector
5. Does the signal value of ECT sensor change according to simulation voltage?
  YES
  - Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good ECM and check for proper operation.
    If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.