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4 DETECT MALFUNCTIONING PART Check the following. I Harness connectors F112, F28 I Harness for open between ECM and engine coolant temperature sensor I Harness for open between TCM (Transmission Control Module) and engine coolant temperature sensor © Repair open circuit or short to power in harness or connectors. 5 CHECK ENGINE COOLANT TEMPERATURE SENSOR Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure. SEF304X OK or NG OK © GO TO 6. NG © Replace engine coolant temperature sensor. 6 CHECK THERMOSTAT OPERATION When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant OK or NG OK © GO TO 7. NG © Repair or replace thermostat. Refer to LC-16, “Thermostat”. 7 CHECK INTERMITTENT INCIDENT Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140. © INSPECTION END GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) Diagnostic Procedure (Cont’d) EC-191 |