Originally Posted by varunr
We know that in some modern cars, there's no temp gauge and it's all dealt with a single alarm (?) and visual tell-tale. Now, assume that the temp sensor goes kaput, what will be the reaction of the car's ECU? Even while using the gauge, during the failure conditions, will the temperature gauge show a zero (way below normal) or high (shooting up..!)? Or in other words, how will we get to know that the temp sensor has gone bad?
I understand that your question makes sense but I think ASS
people will take care of such issues if happens.
What I can say is ECU should be intelligent enough to detect the such Temp Sensor issue and throw corressponding error code. Example:
P0128 - Coolant temperature below operating range - Explanation: low coolant level - Probable cause: faulty CTS, faulty thermostat
P0125 - Coolant temperature always low - Explanation: powertrain control module verifies the engine is a proper operating temperature - Probable cause: Check coolant level, Thermostat defective, ECT (engine coolant temperature) sensor defective