Code 128, A/C High Discharge Temperature/Pressure: Notes

Code will set if Code 121 is not set, A/C disabled due to high pressure, high side temperature is greater than 87°C on first occurrence of Code 128 and as low as 76°C if code has set 15 times in 30 seconds.

1. Determines if conditions to set code are present.
2. Determines if A/C high pressure switch is shorted.
3. Deter mines if A/C high pressure switch circuit is shorted to ground. If not shorted, PCM is faulty.