Chart 1A Low Refrigerant Pressure: Codes B446, B447

Refrigerant Charge Schematic:

CIRCUIT DESCRIPTION
It has been determined from Chart 1 that the problem is not the low refrigerant pressure switch circuit wiring.






CHART 1A
1. This is a test to determine if the A/C low refrigerant pressure switch opens while the compressor is running. If B108 remains "HI" during compressor engagement, then the system fault is due to the refrigerant.
2. This checks if the switch is opening due to a low refrigerant pressure charge or the switch.