Component Inspection

Air Conditioner
B1203 Heater Water Temperature Sensor Short(Low) - Inspection/Repair:_:Component Inspection

Component Inspection

Check Water temp.sensor
1. Ignition "OFF"
2. Disconnect Water temp.sensor and Connect A/C control unit main harness connector.
3. Measure resistance between Signal(+) terminal of Water temp.sensor harness connector and Sensor ground harness connector.(Component side)

Specification :Refer the specifications in Fig.1)




Fig.1)





FIG.1) ** Specifications : Resistance value of water sensor as a function of temperature.
** The actual value may differ from it according to various engine condition.
4. Is "resistance" display near the specified value?





Check A/C-ECU
1. Ignition "OFF"
2. Disconnect Water temp.sensor and Connect A/C control unit main harness connector.
3. Ignition "ON"(ENGINE "OFF").
4. Measure voltage between Signal(+) terminal of Water temp.sensor harness connector and chassis ground. (Component side)

Specification :approx. 5V




5. Is "voltage" display near the specified value?