General Information

Air Conditioner
B1242 Evaporator Sensor Open (High) - General Information

Component Location





General Description

The Evaporator sensor located on the HVAC unit and detects the evaporator core temperature. It is a negative type thermistor whose resistance is inversely proportional to temperature. The Evaporator sensor converts the measured temperature into a voltage value and delivers it to A/C ECU. When core temperature is blow threshold value, A/C ECU interrupts compressor relay power, in order to prevent evaporator freezing by excessive cooling.

DTC Description

DTC B1242 sets if Evaporator sensor signal is at or over 4.9V for 0.3 seconds.

DTC Detecting Condition





Specification

** Resistance value of evaporator sensor as a function of temperature.






Diagnostic Circuit Diagram