Connect scantool to Data Link Connector(DLC).
Engine "ON"
Monitor the "WATER TEMP SENSOR" Parameter on the Scantool.
Are the DTC B1203 present and is parameter of "WATER TEMP.SENSOR" fixed ?
※Parameter of "WATER TEMP SENSOR" will be fixed at 20℃, if there is any fault in WATER TEMP SENSOR
YES
Go to "Inspection & Repair" procedure
NO
Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.