FULL AUTO AIR CONDITIONER Troubleshootinn
3. Inspection of compartment-temperature sensor, outside-air-temperature sensor, and air
sensor circuits
Air conditioner
compressor relay
Air conditioner control
command
Sensor
powersource
Controlled variable
I
Controlled
I
conversion
Compartment
sensor
Fin
sensor
J
Outside air
temperature
sensor
Troubleshooting Hints
l
Diagnosis
No. 11, 12 [Fix compartment temperature sensor input signal at 25°C (77°F).
No. 13, 14 [Fix outside-air-temperature sensor input signal at 15°C
No. 21, 22 [Fix fin
sensor input signal at -2°C
l
Air conditioner control unit terminal voltages
Terminal No.
Signal name
Condition
Terminal voltage
5
Outside-air-temperature sensor
Temperature at sensor 25°C (77°F)
2.2 2.8
Sensor power source
Normally
4.8 5.2
16
Compartment temperature
Temperature at sensor 25°C (77°F) (4
2.3 2.9
sensor
17
Fin
sensor
Temperature at sensor 25°C (77°F)
2.3 2.9
when air conditioner is OFF
TSB Revision
Summary of Contents for 3000GT 1991
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