Component Inspection

B1238 Ambient Temperature Sensor Open (High)

Inspection/Repair - Component Inspection

Component Inspection

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

Specification :Refer the specifications in fig.1




Fig.1) ** Specifications : Resistance value of ambient sensor as a function of temperature.





4. Is "resistance" display near the specified value?





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

Specification :Approx. 5 V




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