What does a Sunload sensor do?
Sunload sensors monitor the intensity of sunlight and adjust the HVAC control to improve the comfort level of the driver and passengers on sunny days. Sunload sensors are usually located at the top of the dash and are often mounted on a removable plate, speaker grill, or defroster vent.
How many Sun sensors are there?
In order to detect the Sun’s attitude in two directions, at least three coarse sun sensors are usually needed, unless a pyramid coarse sun sensor is used.
How can I test the sun load sensor?
Park the vehicle in bright sunlight. With ignition on KOEO check voltage readings against specifications. The voltage reading on display should be low. Start the engine and run the air conditioning on MAX for a few minutes, until the passenger compartment cools down.
How does the sunload sensor work in the shade?
NOTE: Sunload sensors do not respond to fluorescent light, which is read as darkness. When the sunload sensor is checked indoors or in the shade, an open circuit might be indicated. Always check the sunload sensor at a place where sun shines directly on it.
Why does my compressed air compressor not unload?
Compressor does not unload. Check if pressure switch is correctly set and working. Check inlet valve and loading solenoid for good operation. If the safety valve is located before the oil separator, check differential pressure of oil separator. Oil in compressed air can have various causes: Water is a natural by product of air compression.
How to troubleshoot a rotary screw air compressor?
Check the current draw with a current clamp meter. If the motor draws exeessive current: Try to turn the compressor by hand. It should be possible to turn it around. It should turn around smoothly, without any ‘hickups’ (be sure to completely shut down the air compressor!). Check the isolation of the motor windings.
What happens if the sun load sensor fails?
If the sun load sensor fails, a fault code sets, and the program enters a default value and tries to achieve the desired temperature setting. Sun Load Sensor Test: It’s on the dash usually close to the headlight sensor.
Where is the sun load sensor on the dash?
Sun Load Sensor Test: It’s on the dash usually close to the headlight sensor. As sunlight increases, the sensor’s signal voltage decreases. View voltage readings in a capable scan tool datastream. Park the vehicle in bright sunlight. With ignition on KOEO check voltage readings against specifications.
How does the air compressor work during unload?
During unload, no compressed air is produced, so the pressure drops. During load, compressed air is produced and the pressure rises. So, the compressor regulates the pressure in a pressure band by starting and stopping between the lower loading setpoint and the higher unload setpoint.