Diagnostic Procedure For Sensors

Diagnostic Procedure For Sensors

AMBIENT SENSOR

TROUBLE SYMPTOM:
Fan speed is not switched when the fan speed control dial is in AUTO position.

Wiring Diagram:

Step 1-7:

IN-VEHICLE SENSOR

TROUBLE SYMPTOM:
Blower fan speed, outlet port and inlet port do not change after turning the AUTO switch to ON

Wiring Diagram:

Step 1-6:

EVAPORATOR SENSOR

Wiring Diagram:

Step 5-6:

SUNLOAD SENSOR

TROUBLE SYMPTOM:
- Sensor identifies that sunlight is at maximum. Then, A/C system is controlled to COOL side.
- Sensor identifies that sunlight is at minimum. Then, A/C system is controlled to HOT side.

NOTE: When the sunload sensor check is performed indoors or in the shade, it could be diagnosed as having an open circuit. Always check the sunload sensor with the sun shining on it.

Wiring Diagram:

Step 1-5: