Component Inspection

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.

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.

Specification : Approx. 5 V




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