Without Scan Tool

OVERALL FUNCTION CHECK
Instead of performing the Diagnostic Trouble Code (DTC) Detecting Condition, the following method can be used for checking the function of the engine coolant temperature sensor. (However, the DTC detection cannot be confirmed.)

NOTE: If both DTC 13 (P0115) and 98 (P0125) are displayed, first perform TROUBLE DIAGNOSIS FOR DTC 13.

1) Turn ignition switch "ON".




2) Probe voltage meter between Engine Control Module (ECM) terminal 59 and ground.
3) Start engine and run it at idle speed.




4) Check that voltage of engine coolant temperature changes to less than 3.3 volts within 15 minutes. (Be careful not to overheat engine.)