Esteem L4-1590cc 1.6L SOHC 0 MFI 16V (1995)
Engine Temperature Sensor: Description and Operation
Incorporated with coolant temp. gauge and installed to thermostat case, this sensor measures the temperature of the engine coolant and converts its
change into that in resistance through the thermistor like the air temperature sensor. That is, as coolant temperature lowers, resistance increases and as it
rises, resistance decreases. By monitoring the resistance of the coolant temperature sensor, ECM detects the engine coolant temperature and that affects
most systems under the control of ECM.
Engine Coolant Temperature Signal For A/T
ECM transmits the engine coolant temperature signal to TCM by grounding B13 terminal which receives battery voltage from TCM. TCM uses
this signal as one of the factors to control shift to the 4th (O/D) gear, lock-up and T/M throttle pressure.
