Part 2 of 2

Codes B446, B447, B448 - Low Refrigerant Pressure (Part 2 of 2):

Wiring Diagram for Codes B446, B447 & B448 - Low Refrigerant Pressure:

CODES B446, B447 & B448 - LOW REFRIGERANT PRESSURE

Circuit Description:

It has been determined from the previous chart that the problem is not in the low refrigerant pressure switch circuit.



Test Description:

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.