Component Inspection

Check ECTS.

Ignition "OFF".
Disconnect ECTS connector.

Measure resistance between terminals 1 and 3 of the ECT sensor (to ECT sensor side).

Specification:

TEMPERATURE SPECIFICATION

Temperature (°C/°F)	0 (32°F)	20 (68°F)	40 (104°F)	80 (176°F)
Voltage (V)	3.4~3.6	2.5~2.7	1.5~1.7	0.5~0.7
Resistance (Ω)	5.1~6.5	2.1~2.7	0.9~1.3	0.26~0.36

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

Check PCM.
1. Ignition "OFF".
2. Connect Scantool and Ignition "ON" & Engine "OFF".
3. Select simulation function on scantool.
4. Simulate voltage at terminal 3 of ECT sensor signal connector.
  
  Fig 1: Scantool Display - Simulate Voltage At Terminal 3 Of ECT Sensor Signal Connector
5. Does the signal value of ECT sensor changes 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 PCM and check for proper operation.
    If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.