What is insufficient coolant temperature?
This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine.
Where is the engine temperature sensor located?
In most cars, the primary ECT sensor (ECT sensor 1) is installed near the thermostat in the cylinder head or block or on the thermostat housing. A second coolant temperature sensor could be installed in another part of the engine, or in the radiator.
What does closed loop fuel control mean?
In a nutshell, closed loop is where the engine operates with a feedback loop. A sensor closes the loop. The sensor in question is a lambda sensor, also known as an oxygen sensor or air/fuel ratio mixture sensor. In closed loop mode, the engine listens to the lambda sensor to adjust fuel/air mixture.
What does an ECT sensor do?
A coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off.
What sensors are used in closed loop?
In a closed-loop system, an oxygen sensor, along the exhaust path, measures the oxygen to provide feedback regarding the air/fuel mixture and automatically adjusts the amount of fuel required for starting. As the engine temperature rises, sensors provide output to adjust the air/fuel for running.
What causes closed loop fault?
On a two bank vehicle Closed Loop – Fault is when one bank O2 sensor or A/F sensor has a fault. This can be caused by a bad sensor or by one bank being extremely rich or extremely lean. The vehicle will then substitute fuel trim corrections from the “good” bank to the bank it believes has a fault.