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)





fig. 1) ** Specifications : Resistance value of ambient 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 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. 5V



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