- Nov 21, 2011
- 211
Back in March of this year I installed a new thermostat (Motorad 413-192) and ECT sensor (ACD 213-963) because of low engine coolant temperature readings (scangauge data). After installing the new components a stabilized coolant temperature was approx. 200°. Recently stabilized coolant temperatures are now around 182° and will set the P0128 DTC.
Does anyone have the specs for the ECT sensor of resistance vs temperature? I'm leaning toward the sensor being faulty but thought I'd make some comparison measurements of it's resistance and also if it's being supplied the correct voltage.
Another reason I suspect the sensor is I generally observe ambient temperature, as displayed on the DIC, transmission fluid temperature as shown on the scangauge and engine coolant temperature, also scangauge data when the vehicle is first started after sitting overnight. When the vehicle has set overnight and the various fluid temperature are stabilized they generally will be within 2-3° of each other. Now the engine coolant temperature will read about 10° lower.
Does anyone have the specs for the ECT sensor of resistance vs temperature? I'm leaning toward the sensor being faulty but thought I'd make some comparison measurements of it's resistance and also if it's being supplied the correct voltage.
Another reason I suspect the sensor is I generally observe ambient temperature, as displayed on the DIC, transmission fluid temperature as shown on the scangauge and engine coolant temperature, also scangauge data when the vehicle is first started after sitting overnight. When the vehicle has set overnight and the various fluid temperature are stabilized they generally will be within 2-3° of each other. Now the engine coolant temperature will read about 10° lower.