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EC-178 < COMPONENT DIAGNOSIS > [VQ35HR] P0125 ECT SENSOR P0125 ECT SENSOR Description INFOID:0000000003133341 The engine coolant temperature sensor is used to detect the engine <Reference data> *: These data are reference values and are measured between ECM terminals 71 DTC Logic INFOID:0000000003133342 DTC DETECTION LOGIC NOTE: DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION With CONSULT-III 1. Turn ignition switch ON. 2. Select “DATA MONITOR” mode with CONSULT-III. 3. Check that “COOLAN TEMP/S” is above 10 ° C (50 ° F). With GST Follow the procedure “With CONSULT-III” above. ° C (50 ° F)? SEF594K Engine coolant temperature [ ° C ( ° F)] Voltage* (V) Resistance (k Ω ) –10 (14) 4.4 7.0 - 11.4 20 (68) 3.5 2.37 - 2.63 50 (122) 2.2 0.68 - 1.00 90 (194) 0.9 0.236 - 0.260 SEF012P DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0125 Insufficient engine cool- • Voltage sent to ECM from the sensor is not practical, even when some time has passed • Engine coolant temperature is insufficient for closed loop fuel control. • Harness or connectors (High resistance in the circuit) • Engine coolant temperature sensor |