Component Inspection

Check ECTS.

Ignition "OFF".
Disconnect ECT sensor connector.

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

Specification:

TEMPERATURE AND RESISTANCE SPECIFICATIONS

Temperature (°C/°F)	0°C (32°F)	20°C (68°F)	40°C (104°F)	80°C (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

G07374097

Is the measured resistance within specifications?
YES
- Go to " 2 Check PCM" 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 PCM.
1. Ignition "OFF" & Engine "OFF".
2. Connect scantool and Ignition "ON".
3. Select simulation function on scantool.
4. Simulate voltage at terminal "3" of ECT sensor signal connector.
  
  Fig 2: Display - ECT Sensor Voltage Simulation
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 damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good PCM and check for proper operation.
    If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.